2018
Open Wheel Rules (Updated
7-1-18) 411 Motor Speedway will utilize UMP DirtCar
Modified rules for 2018. Rules are as follows: 2018
UMP DIRTcar Modified Rules TO ALL COMPETITORS/PARTICIPANTS *
Under the guideline of the 2018 DIRTcar UMP Modified rules any and/or rules and
as stated in the 2018 DIRTcar Rule Book, all DIRTcar rules applies to all divisions,
except in instances where any local track rules, pertaining to any item are listed
in the local track rules, whether that is in the technical components and/or the
racing procedures and/or overall rules that are administered by the local track
officials and management. In those instances, and where applicable, the local
track rules shall prevail. * The 2018 DIRTcar UMP Modified Rules have been
established to include the rules in several different regions of North America,
refer to the rules that are in effect in your region. * The following are
the 2018 DIRTcar UMP Modified rules. All amendments supersede any previous rules
regarding any technical article and/or aspect. * Under the guideline of the
2018 DIRTcar UMP Modified rules any and/or rules and as stated in the 2018 DIRTcar
Rule Book, all DIRTcar rules apply to all sanctioned divisions. * The specifications
published shall be considered a section of the Official Rules and Specifications
for all events, series and sanctions by World Racing Group. All sections should
be considered when determining specifications and governance.
15.0 DIRTcar
UMP Modified ANY CAR, TEAM AND/OR DRIVER THAT DOES NOT MEET THESE SPECIFICATIONS
AND/OR EQUIPMENT REQUIREMENTS WILL BE SUBJECT TO PENALTIES AS DETERMINED BY THE
DIRTcar and/or World Racing Group OFFICIALS 15.1 Engine A. Any
American made push-rod type engine will be permitted as long as the rear of the
engine bell housing flange is mounted at least 72-inches forward from the
center of the rear axle. The engine offset must remain within two (2) inches
of the centerline from the cross member. The minimum engine height when measured
from the ground to the center of the crankshaft is 11 inches. Other engines
of the push-rod type that meet this criteria may be approved for competition.
B. All engines used in competition must be able to be used in a conventional
passenger car without alteration. Alteration of motor mounts will not be permitted.
Alteration of the castings and/or fittings will not be permitted. Any machine
work on the outside of the engine or machine work on the front or rear of the
crankshaft will not be permitted. C. Aluminum blocks will not be permitted.
D. Magnetos will not be permitted. E. Wet sump oiling systems must be
operative and will go with a claim by DIRTcar officials. Overall dry sump systems
will not be permitted. F. Alteration to the cooling system will be permitted.
If alterations to the cooling system are made the stock-appearing hood line must
be maintained. G. The battery must be securely mounted and shielded. The battery
must not be mounted inside the drivers cockpit. H. The exhaust system(s)
must be mounted with the exhaust directed away from the vehicle and away from
the ground. The exhaust system(s) must remain completely below the interior deck
of the car. The entire exhaust system (including the exhaust pipe and/or header
exits) must be inside all parts of the body. The only breach of any interior or
exterior body panel that will be permitted is for routing the left side header
or exhaust pipe on the left side of the car. When routing the left side header
or exhaust pipe through the left side firewall a maximum of 1/2 inch clearance
around the header or exhaust pipe will be permitted. I. Local track rules
will prevail when decibel and/or muffler rules. J. One two or four-barrel
carburetor is required. K. The engine must be a normally aspirated configuration.
L. Fuel injection systems or electric fuel pumps will not be permitted. M.
There may be specific engine rules issued for each region of North America that
deviate from the standard UMP Modified Engine rules included herein.
15.1.1
Engine Claims A. Any qualified UMP Modified competitor has the right
to claim any engine provided they follow the specifications as set forth by the
rules herein. To begin the claim a $550.00 fee, plus the agreement to an engine
exchange in addition to $50.00 for the tow truck operator. All claims do not include:
flywheel, clutch, pressure plate, bell housing, headers, carburetor, starter,
fan & pulleys, motor mount, sending units and switches for oil pressure and
water temperature, carburetor adaptor, clutch ball, clutch arm, throw out bearings,
dip stick, water pump, distributor, plug wires or fuel pump. B. Any competitor
who processes a claim must have taken the checkered flag in the feature race and
have finished the feature race on the lead lap. The claim must be
presented in cash or certified check to promoter or designated DIRTcar official
within five (5) minutes after the completion of the feature race. The driver must
have the claim payment and his/her DIRTcar current/valid membership and claim
card available. A third party cannot provide these items to the claiming driver.
(Yearly membership runs from January 1 through December 31.) All claims, positive
or negative, must be reported immediately to DIRTcar headquarters by the event
promoter and/or chief steward of the event. Drivers will only have the ability
to make two (2) claims in any UMP Modified season. A driver can claim another
drivers engine only once during the year. Only the engine of the event winner
can be claimed. In case of multiple claims on the same engine, the engine will
go to a qualified driver who finished the furthest back in the field on the lead
lap. Drivers may not claim an engine if he/she has spun out and caused a caution
period. If a claim is refused, the claim is not held against the claiming driver.
The claim rule is intended to maintain cost effectiveness and a level playing
field in the UMP Modified division. C. Any driver making a claim must drive
his/her car immediately after the finish of the feature, under its own power,
directly to the claiming area. Only drivers and officials will be permitted in
the claim area. The claim area must be designated by the promoter to all drivers
at the drivers meeting prior to the feature event. The feature winner must
go to the claim area immediately following the finish of the feature event. If
no driver comes immediately to the claiming area, the winner may proceed as directed.
D. The claimed engine must be completely removed within one (1) hour from
the time the claim is made. E. The first sell/no sell or trade of the engine
by the driver being claimed is considered binding. F. Only a qualified driver
may claim an engine and only the winning driver may agree to sell. G. Any
refusal to sell forfeits all cash, trophies and contingency winnings for the feature
as well as all DIRTcar State and Nationals points award for that night.
Any driver refusing to sell his/her engine the first time is fined $200.00 and
is suspended for the next racing event at their home track and one (1) week from
all DIRTcar sanctioned race tracks. The second infraction for a driver refusing
to sell their engine is a $600.00 fine and a suspension from all DIRTcar sanctioned
tracks for 30-days. H. All claimed engines must be removed from the car at
the track. The buyer must examine the engine before removal. Once removal has
started, the sale is final. Any sabotage to claim an engine will result in the
saboteur being suspended from all DIRTcar races for 30-days and until the fine
of $1,000.00 is paid to DIRTcar. I. To claim an engine, the claiming driver
must have raced at least one-half of the sanctioned events at the sanctioned track
where the claim is made or at a minimum the three (3) most recent consecutive
feature events at that track. A driver can have his/her engine claimed at any
time. No claim can be made against a driver on his/her first night at a sanctioned
track. 15.2 DC 18 Engine Option As an option to the current DIRTcar,
UMP Modified engine rules, an approved DC18 Chevrolet Performance CT525 Engine
will be permitted for use in competition in all DIRTcar UMP Modified Events providing
ALL the following requirements are strictly adhered to. An approved DC18 Chevrolet
CT525 Engine is defined as follows: A. Chevrolet Performance Engine, Part
number GMP-19331563DC18 or GMP-19331563DC18K B. The engine assembly MUST be
obtained from the DIRTcar approved vendor. C. Engine must have complete unaltered
Chevrolet Performance engine seals installed at the time of manufacture assembly.
D. Engine must have complete unaltered secondary DIRTcar seals installed by
the approved vendor prior to delivery of the engine. E. Engine must have approved
vendor seals and inventory numbers. F. Ignition system must be controlled
by an approved, pre-programmed MSD 6014CT control unit with the correct corresponding
identification number for the engine being used. G. All Engines, seals,
and applicable components will be entered into a master database and must correspond
to the engine being used. H. The engine and engine components, engine seals,
engine identification numbers and the likes must be used as received by the DIRTcar
UMP approved vendor without modification, and/or alteration of any kind. I.
All DC18 engines must use gasoline or gasoline/ethanol blends. Methanol is not
approved for use with the DC18 engine.
Approved Engine Vendor(s): The
DIRTcar UMP approved DC18 engine vendor for 2018 is: Pace Performance (888)
748-4655 Don Blakshear 50 Karago, Boardman, OH 44512 donblackshear@paceperformance.com
www.paceperformance.com 15.2.1 Specifications A. The DIRTcar approved
DC18 Chevrolet Performance Engine part number GMP-19331563DC18 or GMP-19331563DC18K
will be offered from Pace Performance in two approved versions reflecting the
following part numbers: a. GMP-19331563-DC18 Base engine as received
from Chevrolet with applicable seals, identification numbers and pre-programmed
MSD 6014CT ignition control b. GMP-19331563-DC18K Base engine as received
from Chevrolet with applicable seals, identification numbers and pre-programmed
MSD 6014CT ignition control and the following approved bolt on componets: i.
Pace steam line kit including billet water outlet in #16, #20 or 11/2 hose
ii. Jones Water Pump kit iii. Pace crankcase vent system iv. Remote
oil filter mount kit v. Oil Heater vi. 8 quarts of break in oil and racing
filter vii. Aluminum motor mounts 15.2.2 Directive The direction
of the DIRTcar approved DC18 Chevrolet Performance Engine program is to maintain
a cost-effective, affordable racing program. Any alteration made in an attempt
to influence the integrity of this program will not be permitted. The judgment
and determination of any such decision will be at the sole discretion of DIRTcar
and/or World Racing Group Officials. A. The engine and all components must
remain in their original configuration and form as purchased and/or delivered
from the DIRTcar approved vendor. Any alterations to the engine will not be permitted.
The engine must remain as manufactured by Chevrolet. B. All engines are to
remain sealed from the factory. The original factory seals must remain unaltered.
Tampering, removal, modifications of any type and/or broken factory seals will
not be permitted. C. The Chevrolet Performance Engine seals (bolt-type) must
remain unaltered. DIRTcar and/or World Racing Group Officials require secondary
sealing and verification of all seals on any Chevrolet Performance Engine by the
DIRTcar approved vendor. Tampering with and/or alteration of any seals will not
be permitted and is subject to immediate penalty and/or suspension. D. The
DIRTcar approved MSD 6014CT ignition control is pre-programmed to a specified
timing curve and a maximum RPM limit. Routine testing of controllers will be performed
by DIRTcar Technical Officials. Any attempt to reprogram controller whether successful
or not is subject to immediate penalty. DIRTcar Officials reserve the right to
randomly confiscate or exchange any competitors ignition controller. E.
Routine external maintenance (oil and filter changes, sparkplug replacement, belts,
hoses, etc.) will be permitted. F. Approved repair is permitted; however,
the repairs must be initiated and completed by the DIRTcar approved vendor. Engine
rebuilds are not permitted. DIRTcar must authorize DC18 Chevrolet Performance
Engine repairs. G. DC18 Chevrolet Performance Engine repair procedure works
as follows: a. Contact DIRTcar Technical Officials for authorized repair.
b. The DIRTcar Technical Officials will approve a repair and provide contact
information to the competitor for the DIRTcar approved vendor to obtain
an estimate of repair(s). c. Based on the estimate and the detail of the repair,
DIRTcar officials will determine if the repairs may be made or if a new engine
must be purchased. Any repair estimates presented to the DIRTcar Officials that
meet and/or exceed 80% of the actual price of a new engine, a new engine must
be purchased. The engine that was damaged will no longer be eligible for competition
d. If a repair is approved, the DIRTcar approved vendor will inspect the engine
and make the repair to ensure that the engine maintains the DC18 Chevrolet Performance
Specifications. e. Upon completion of the repair(s) the engine will be resealed
before being released for competition. H. DIRTcar and/or World Racing Group
Supervisory Officials reserve the right to inspect, exchange and/or confiscate
any DC18 Chevrolet Performance Engine at any time. Failure to surrender the engine
and/or submit the engine for inspection will result in disqualification from the
event and/or suspension. I. The DC18 engine is NOT eligible for engine claims
as described in section 15.1.1 Engine Claims.
15.3 Transmission
& Driveline A. The drive shaft must be made from magnetic steel or approved
carbon fiber. Aluminum or fiberglass driveshafts will not be permitted. The driveshaft
must be painted white with the car number clearly labeled on the drive shaft.
B. A 1/2-ince x 2-inch 18-gauge steel drive shaft hoop is mandatory.
The drive shaft hoop must be at least six (6) inches behind the universal-joint.
Two hoops are strongly recommended. A single 1/8-inch plate on the right
side of the drive shaft tunnel is recommended. C. All competitors are encouraged
to perform systematic checks on their drive-train. D. Direct drives and/or
any type devices will not be permitted. E. The transmission must be bolted
to the engine. All cars must have forward and working reverse gears and be able
to shift to forward or reverse with engine running. BERT-type transmissions will
be permitted. F. Clutch-type transmissions must be equipped with explosion-proof
steel bell housing. In lieu of an explosion-proof bell housing or if one is not
available for your engine, a shield of at least 1/2 inch x 6-inches
covering the clutch area 360 degrees securely fastened in place and fabricated
from magnetic steel will be permitted. 15.4 Chassis & Frame
A. Only factory production full 1965 or newer parallel American passenger
car frames will be permitted. The frame must be complete in front of firewall.
Cutting of the frame in any way in front of firewall will not be permitted. B.
The frame must remain unaltered and must meet the requirements of the attached
drawing. C. D. The Right-side frame rail may not be altered and/or raised
and/or moved from the stock OEM location in any manner and must measure a maximum
of six (6) inches from the ground to the bottom or lowest edge of the frame rail.
E. The front cross member may be notched to allow clearance for the radiator
only. The cross members must be plated to retain complete box configuration. F.
Jeep, Bronco, 4-wheel drive, front wheel drive or sports car frames will not be
permitted. G. The minimum wheelbase permitted will be 108 inches. The
maximum wheelbase permitted will be 112 inches. No tolerance measurements
are as posted H. Fiberglass lift bars and/or rear torsion bars will not be
permitted. I. Any frame may not be widened or narrowed and must be able to
support the roll cage on both sides and must be full and complete on both sides.
J. The minimum frame and body height from ground is four (4) inches. K.
The front bumper must be mounted to the ends of the frame with the bottom loop
parallel to the ground. L. A minimum of 1 diameter tubing and/or pipe
is required to for towing of the vehicle. M. The rear bumpers must be constructed
of tubing and/or flat stock. All rear bumpers and/or tubing utilized in the fabrication
of the rear bumper assembly must have an end cap. The rear bumpers must protect
the fuel cell. N. The bumper(s) (front and rear) when measure from their center(s)
must have a minimum of 25 inches of ground clearance. There will be a two
(2) inch tolerance, plus or minus regarding this dimension. The rear bumper and/or
the nerf bars must not extend beyond the width of rear tires. All bumpers must
have round edges. Sharp edges on any bumper and/or bumper surface will not be
permitted. O. The brace bars forward of the roll cage must not extend
higher than stock hood height. P. The rear push bars must not extend beyond
six (6) inches of the rear quarter panel(s). Q. All side bars and bumpers
must be capped on ends. R. The maximum overall width of the car, front and/or
rear, shall not exceed 78 inches when measured from the outside of the tire
tread on both sides of the vehicle. A maximum one (1) inch spacer between
the hub and wheel will be permitted. Steel and/or aluminum spacers will be permitted,
provided the overall tread width of the vehicle does not exceed 78-inches.
15.5 Weight A. All added weight(s) must be painted white with
the car number clearly labeled on each weight. B. All added weight(s) must
be securely mounted to car with minimum of two (2) 1/2-inch bolts that pass
completely through each weight and the car. Weights that are mounted on the rear
bumper or outside the body of the car will not be permitted. All added weight
must be mounted below all windows and the interior sheet metal. C. All added
weight(s) must be securely attached to the frame below the body decking. D.
Frame is defined as the steel welded structure only. E. Any part that moves
or is not a fixed component to the steel frame structure may not be used for any
weight attachment. F. Weights attached to the rear bumper and/or outside the
frame will not be permitted. G. Any car that loses any weight(s) during any
event may be fined up to $500.00. H. The minimum weight of car with driver
at all times including after the race is 2,400 lbs. I. All weight determinations
will be measured on the scales selected by the local track officials and/or by
DIRTcar Officials for each racing event. Burn off and/or weight percentages and/or
tolerance after the completion of any racing event will not be permitted. J.
All cars will weigh as directed by announcement, radio message or posted at the
designated Scales, per the weight rule, and track layout. All cars must weigh
in immediately following their races as directed. Any detour, redirection, mud
puddle meandering, may result in disqualification or penalty K. The winner
must weigh prior to any Winners Circle Interview or Presentation. L.
Any detour to the scale, may result in loss of finish position or time. Should
any car stop on the way to the Scales, and be touched by anyone other than a Race
Official, the Driver may be disqualified. Any car not meeting the minimum weight,
after the designated event will lose its time, and or finishing position from
that event. M. The scales used for the event, provided by the series or the
track, will be considered the official scales for the event. N. Scales will
be available for any team to verify its car weight and determine the scale weight.
O. Officials will allow a car to re-scale two times by pulling off scale and
pulling back on. Reading of the third attempt will become the entered weight.
15.6 Fuel Cells & Fuel A. Fuel cells must be used in accordance
with the manufacturers specifications. Alterations of any kind will not be permitted
(example: alterations to top plate, alterations or removal of foam, etc.). B.
Either meet FT3 or SFI 28.3 requirements and/or Include: a. Key components
of an approved fuel cell are: a metal container, bladder, foam baffling for slosh
and explosion suppression, flap valve and rollover vent valve, threaded or snap
lock cap. b. Fuel valve plate, fuel pickup and fuel return fittings must be
on the top of the fuel cell. c. The fuel cell must be completely enclosed
in an 18-gauge magnetic steel container. d. Fuel cells that are not contained
within a welded steel tubing "rack" must have two (2) equally spaced
steel straps that measure two (2) inches wide by 1/8 inch in thickness that completely
surround the fuel cell. The straps must be bolted to the frame. Longitudinal (front
to rear) orientation is recommended for strap mounting. C. The maximum capacity
for the fuel cell will be 22 gallons. Engines that are fueled by alcohol may have
a maximum capacity of 32 gallons. D. All fuel cells must be completely visible.
E. The fuel cell must not extend lower than protective tubing. F. Racing
gasoline or alcohol will be permitted. G. Nitrous oxide, nitrous methane,
propylene oxide or any type of additives will not be permitted. 15.7
Body (See drawing diagram for reference there may be dimensions referenced
in the drawing diagram that are not referenced in the written rules and vice versa.
All dimensions whether written and/or referenced in the drawing diagram dimensional
are rule(s)). A. All bodies must follow dimension(s) and the appearance as
shown in diagram. The body shall be the fabricated modified body from approved
vendors. The body must be symmetrical, including but not limited to doors, nose,
sail panels, spoiler supports, etc. B. The front windshield and rear window
support must be stock appearing. The front window support(s) may have a clear
Lexan support of no more than 16 inches including the roof post at the bottom
and going straight to the roof. The support must be securely fastened in a positive
manner. C. The front roof post must be in a straight line from top to bottom.
D. The sides of the engine compartment must remain open. Any side panels in
the engine compartment area will not be permitted. A five (5) inch maximum
drop of the hood on either side of the hood will be permitted and it must be enclosed
at the rear of the hood. The firewall on drivers side must meet the front
of the door. The firewall must be a minimum of 16-inches in length from
top-to-bottom. E. The top of the doors must remain in line with the rear engine
plate. The bottom of the doors may extend a maximum of eight (8) inches
past the motor plate toward the front of the vehicle. Any material that exceeds
8-inches forward of the engine plate will not be permitted. F. Right
panel from top of door to bottom of door may not be no more than 3 inches and
must be mounted straight inside the bottom. G. A maximum one (1) inch
flange on the outside edges (left and right side vertically) for the purpose of
strengthening only will be permitted on the front nose only. Side fins and/or
flanges of any kind along the length of the entire car (hood, front, and/or roof)
will not be permitted. H. A maximum of one (1) stone deflector, mounted only
on the right side of the car, for rear mounted oil pumps, oil filters, and for
the main oil tank will be permitted. The deflector may be made of steel, aluminum,
or heavy gauge wire. The cover may only be mounted near the unit it and is designed
to protect with a maximum size of eighteen (18x18) inches square and
mounted only from the upper right frame rail to the lower right frame rail. I.
The minimum roof height is 42 inches with a maximum height of 52 inches.
J. The minimum deck height is 28 inches with a maximum height of 39
inches. K. All cars must have a car number on both sides and the roof that
are at least 18 inches in height and 14 inches in width. L. The
drivers last name must be displayed under the car number in a legible font
that is a minimum of eight (8) inch high letters. M. A minimum of two
(2) inches of tire clearance from the body is required. N. The minimum
ground clearance will be four (4) inches. O. The measurement from center
of the hub to the rear top of deck will be a minimum of 34 inches and a
maximum of 48 inches. P. The maximum body width at the bodys widest
part will be 72 inches. The minimum of width at the bodys narrowest
part will be 53 inches. The top of the doors may have a maximum width of
67 inches. The bottom of the doors may have a maximum width of 68
inches. Q. On the left side, the rear of the door may flare out six (6)
inches for tire clearance. Q. The bottom of the flare must be curved and rounded
not pointed in any fashion. R. The maximum rear width of car must be 67
inches at the widest point. S. The maximum roof width will be 50 inches
with a minimum of 44 inches. T. The maximum roof length will be 56
inches with a minimum roof length of 41 inches. U. The maximum height
on rear roof post vertical is 3 inches. V. The nose piece must not exceed
45-inches in width, centered between the frame rails and must not extend
past the leading edge of the front bumper. The nose piece must have a minimum
of six (6) inches from the ground to the bottom edge of the nose piece.
W. The MD3 D3 Modified Aero Valance is approved. X. Rear spoilers of any
type, including but not limited to, shaping of panels, shaping of interior body
panels, shaping and/or redirecting airflow with sail panels, etc., will not be
permitted. 15.7.1 Interior and Driver Compartment A. All windows
must have a minimum 11-inch vertical opening. The entire interior must have
a minimum of 11-inches of clearance from the interior deck to the roof and
all sections of the roll cage. The minimum window opening will be 12 inches.
The interior deck sheet metal to the right side of the driver from the back
of the seat forward should be fabricated on an angle from the driveshaft tunnel
to the right-side window to promote ease of exit for the driver through the right
side and or front window opening. B. A master ignition switch within easy
reach of the driver is mandatory. The switch must be clearly labeled ON
and OFF. C. Hydraulic and/or pneumatic weight jacks, trackers,
or similar adjustable components of any type will not be permitted. D. Mirrors
of any type will not be permitted. E. The drivers compartment must be sealed
from the engine and the race track. The rear bubble of the hood should be closed
and sealed from the driver. F. The maximum slope/rake of the interior sheet
metal shelf front-to-rear is 4-inches when measured from the
firewall to the top of the most rearward part of the rear deck. A maximum of 2-inches
of slope/rake will be permitted in front of the rear of the seat to the firewall
and a maximum of 2-inches of slope/rake will be permitted from the rear
of the seat to the top of the most rearward part of the rear deck. G. The
top of the interior must be flush with the top of door and quarter panels. A one
inch drop on the inside will be permitted when measured laterally from the top
of the doors to the lowest part of the deck. H. Any car in competition must
have right side door bars as part of the roll cage. Please reference I. 15.11
B in the roll cage section of the 2018 DIRTcar UMP Modified Rule Book.
15.7.2 Roof & Roof Supports (see drawing diagram for reference)
A. All roofs must be full size. Half-moon roofs will not be permitted. The
rear edge of the roof may not be mounted more than 12 (twelve inches) past
the rear axle. The roof must be symmetrical. B. Wings, roof spoilers or ground
effects of any kind will not be permitted. C. All flat type roofs will be
allowed a maximum 3-inch difference in height between the front of the roof
and the rear of the roof. This measurement may be taken from the interior and/or
the ground. The rear of the roof must maintain the same height from side to-side.
D. All curved type roofs will be allowed a maximum of 5-inches in the
front and 2-inches in the rear. The break in the roof must be within 6-inches
from the center of the roof. E. E. Wedge roofs will not be permitted. F.
Dished roofs will not be permitted. Roofs must be rounded side-to-side. Bead rolls
will be permitted. G. The rear roof post must begin where it meets the back
edge of the roof. The rear roof supports may not extend past the front side of
rear upright of the roll cage. H. The side vents on the front roof posts may
extend rear ward from the lowest point, a maximum of 16-inches, then at
a 90-degree angle to roof for one (1) configuration, side vents must meet the
outside of the car. I. The roof side (sail) panel window size must be 10-inches
x 15-inches and must match drawing number -2- side view. There will be a
tolerance of 2-inches at the top and 3-inches at the bottom. A maximum
crown of two (2) inches will be permitted, measured from the center of a common
tangent point on either side of the crown. The roof side (sail) panels must be
symmetrical. J. If the long roof side (sail) panel is being used a 1-inch
radius will be permitted. K. Any sun shield must be on hinge for easy exiting,
taping will not be permitted. The window opening must remain at a minimum of 12-inches.
L. All race cars in competition must meet the measurements illustrated in
the DIRTcar drawing. M. There are only 4 (four) approved roof supports to
choose from. N. The roof should be single thickness of material. The roll
bar hoops must be exposed for inspection. O. If the roof is curved then a
level will be placed on the top of the car and if the roof is 5- inches
or less in the front and 2-inches or less in the rear and the break is in
the middle then the roof will be permitted. P. The roofs must be stock appearing.
The roof must maintain the same height on both sides. If a DIRTcar and/or local
track official determines the roof does not meet the requirements as stated above
then a penalty as determined by the official may be determined prior to competition,
additional weight and/or other penalties, unless the roof can be returned to within
the parameter as stated above prior to competition in the event that the roof
was inspected for. 15.8 Suspension / Steering Suspension/Steering
designs and applications are constantly evolving. Although the intent of the suspension/steering
rules are an attempt to accommodate the majority of suspension/steering and suspension/steering
component designs and applications currently being used in competition, the rules
cannot be absolute. Any and all new designs or modifications to an existing
suspension/steering and/or suspension/steering component must be communicated
to and approved by DIRTcar Racing before being used in competition. Unless
otherwise specified, suspension/steering components must be manufactured using
magnetic steel only. This includes but is not limited to, shocks, hubs, all control
arms (A-frames), axle tubes, tie rods, etc. 15.8.1 Front Suspension
A. All front suspension and steering components (except the upper control
arm mounts) must utilize the original O.E.M. suspension and steering component
mounting holes. All mounting holes must remain a single round hole as produced
by the O.E.M. Adjustable mounts and/or "slugs" will not be permitted.
B. Weight jacking bolts (wedge bolts) may be added to O.E.M. frame but, must
be located within 1 (one) inch of the original centerline of the O.E.M. front
spring location. C. Unless otherwise specified, the front suspension components
must be O.E.M. serviceable parts and originate from the same O.E.M. frame manufacturer
for that application. D. Unless otherwise approved, only O.E.M. and/or O.E.M.
replacement type passenger car spindles will be permitted. Spindle O.E.M. manufacturer
and model is optional. Fabricated spindles will not be permitted. Spindles must
not be altered. O.E.M. spindles utilizing a removable steering arm must use the
same O.E.M. steering arm originally supplied with the type and model of spindle
being use or a fabricated steering arm that is an exact match (length, mounting
holes, etc.). If a fabricated steering arm is used, competitors must be prepared
to supply an O.E.M steering arm for an inspection comparison.** E. As of 01/01/2018
the following approved multiple piece aftermarket spindles may be used for competition.
a. Speedway Motors: 91034313, 91034501/2, 91034511 b. Afco: 1063435L/R
c. Argo manufacturing: RP-929 (AMC), Mustang II Alterations and/or
relocation of the lower control arm mounts will not be permitted. Lower control
arms may be O.E.M. lower control arms for the frame being used or DIRTcar approved
fabricated lower control arms, which are mounted in the O.E.M. location and maintain
the O.E.M. dimensions. Lower control arms must be the same length when comparing
to O.E.M. right and left. The lower coil spring seat must be an integral welded
component of the lower control arm. If using spherical rod ends (heim joints)
as lower control arm mounts, the spherical rod ends (heim joints) must be welded
to the lower control arm to prevent adjustment. Competitors must be prepared to
supply an O.E.M lower control arm for an inspection comparison. All fabricated
lower control arms must fit the DIRTcar/UMP lower control arm fixture(s). F.
Tubular-type upper A-frames will be permitted. The upper A-frame mounting locations
may be relocated. Aluminum cross shafts will be permitted. 15.8.2
Steering A. An O.E.M. steering system applicable to the O.E.M. frame assembly
must be used. The steering system must consist of 1 (one) reciprocating steering
gear assembly, 1 (one) pitman arm, 1 (one) idler arm, 1 (one) center steering
link (drag link), 2 (two) inner tie rod ends or spherical rod ends, 2 (two) adjusting
sleeves, and 2 (two) outer tie rod ends or spherical rod ends. Additional components,
braces, rods, etc. will not be permitted. B. O.E.M. or exact fit aftermarket
replacement center steering (drag) link, pitman arm, and idler arm available at
auto part replacement venues will be permitted. Aftermarket components must match
O.E.M. for all specifications, dimensions and design. Only single point round
tapered mounting holes and O.E.M. tapered ball studs will be permitted. ** C.
**As of 01/01/2018 fabricated center (drag) links, braces, etc. will no longer
be permitted. D. Steel spherical rod ends (heim joints) and fabricated
magnetic steel tie rod adjusting sleeves will be permitted. 5/8"or larger
spherical rod ends and fasteners must be used. The inner rod end must connect
to the center steering link using a stud that is tapered to fit the center steering
link on one end with a straight 5/8"stud on the opposite end, or the center
steering link may be drilled to accept a 5/8" bolt. The outer rod end may
use a 5/8" grade 8 bolt with a bump steer spacer to connect to the steering
arm. The O.E.M. steering arm may be drilled to accept a 5/8" bolt. Tie rod
adjusting sleeves must be magnetic steel tubing. E. The steering shaft and
interior mountings may be fabricated. The steering wheel must remain on the left
side of the vehicle. The steering shaft must have at least 1 (one) universal type
joint to allow shaft to "fold" under impact. F. All steering wheels
must connect to the steering shaft with an approved quick release coupler. SFI
certified steering wheel couplers are highly recommended.
15.8.3
Rear Suspension A. Rear suspension configuration used on current and new chassis(s)
must be the design commonly known as four (4) link. Older cars currently competing
with other rear suspension designs will be allowed to compete until further notification
at the discretion of the Series Director. B. The frame/roll cage structure
must have integral welded mounting brackets for the attachment of rear suspension
components. Frame suspension mounts may be welded or bolted securely (without
any movement) to the frame/roll cage structure. C. The only material used
to fabricate frame suspension mounts that will be permitted is magnetic steel.
D. Axle Housing Mounts: a. Aluminum birdcages will not be permitted. b.
Axle housing mounts may be a solid (welded) type or a floating type (birdcage)
design. c. Only one (1) axle housing mount per side will be permitted. E.
The final assembled axle housing mount must be a one (1) piece mount. When a floating
type mount (birdcage) is fabricated using two (2) pieces, the two (2) pieces must
create a common one (1) piece pivot (barrel). The two (2) pieces must be fastened
or welded together to prevent independent movement of the two (2) pieces. The
axle housing mount must attach directly to the axle tube with clearance only to
permit rotation of the entire mount. Fore, aft or vertical movement of the mount
or the axle housing within the mount will not be permitted. F. Only 2 (two)
radius rods per side will be permitted to be connected from the axle housing mounts
(birdcages) to the frame. Radius rods must be magnetic steel. Spring rods or any
type of radius rods that change length dynamically are not permitted. (See Brakes
15.7.6D for floating caliper specifications) G. Independent rear suspensions
will not be permitted. 15.8.4 Springs and Shocks A. One (and
only one) coil or leaf spring per wheel must be used. Coil springs must be manufactured
from magnetic steel. Rear leaf springs (if used) may be either magnetic steel
or an approved composite material. All coil springs must be a minimum of 5 (five)
inches in diameter. Coil springs must be wound with all coils being the same O.D.,
I.D. from the top to the bottom of the spring. The coil spring wire diameter must
be the same from the top to the bottom of the spring. Coil spacing must be equal.
Round coil spring wire must be used. Coil springs with linear spring rates are
the only coil springs permitted. Air springs are not permitted. B. Front coil
springs: a. The top of the front coil spring must be closed end and ground
flat. b. The upper front coil spring mount must be flat and support the top
of the spring 360 degrees. c. The lower end of the front coil spring must
be an open end with a maximum gap of 1/4 inch between the "tail" of
the spring and the next coil. d. The lower front coil spring mount may have
a single step to prevent spring rotation and accommodate the open end of the spring.
The step of the lower front coil spring mount must not exceed one (1) inch in
height. The lower coil spring mount must be a welded integral component of the
lower control arm. When installed the lower end of the front coil spring must
be supported 360 degrees. C. Rear Coil Springs: a. The top and bottom
of the rear coil spring must be closed end and ground flat. b. The upper and
lower rear coil spring mounts must support the spring for 360 degrees. c.
Rear steel coil-over eliminators and/or steel/aluminum coil-over kits will be
permitted. The coil-over eliminators and/or coil-over kits must conform to the
shock and spring rules. d. Only one coil spring per wheel will be permitted.
D. All rear springs must have a tethered and/or cable system in place to securely
fasten them in position in the car.
15.8.5 Shocks A. Only magnetic
steel body, mono tube shocks with approved external adjustments will be permitted.
Approved external adjustments are adjustments that can only be made with the shock
absorber removed from the car. Remote adjusters of any type will not be permitted.
Shocks must be conventional oil emulsion design. Shocks may be gas pressurized
providing gas reservoir is an integral component of the shock body. Gas must be
separated from the oil by a divider piston with a positive stop. The external
portion of the shock shaft must remain exposed at all times. The lower shock "bearing"
inside diameter and the shock shaft must not exceed 5/8" in diameter. Pneumatic
(AIR) shocks, remote adjustable shocks, and remote gas reservoirs will not be
permitted. B. Coils over shocks of any type on the front of the car will not
be permitted. C. Only one shock per wheel will be permitted. Lay down shocks
less than 12 (twelve inches) away from brake rotor will not be permitted.
D. The shock absorber claim will be $350.00 per shock absorber. (No exchanges.)
15.8.6 Axle Housing & Rear Differential A. The axle housing
must be of the closed tube design utilizing full floating
magnetic steel hubs and axle shafts. Live axle-type rear ends will
not be permitted. B. Quick change rear ends will be permitted. C. The
center section of the axle housing must be manufactured of either aluminum or
magnesium. D. Axle tubes must be one (1) piece and manufactured of magnetic
steel only. Axle tube internal inserts or external sleeves will not be permitted.
E. The axle tube must not exceed (3) three inches O.D. (outside diameter)
at any point from center section to hub. F. Aluminum spools will be permitted
15.8.7 Brakes A. All cars must be equipped with a working braking
system on all four wheels and all four wheels must be able to stop/brake at all
times. B. Front brakes must utilize a one piece O.E.M. or aftermarket O.E.M.,
magnetic steel hub and vented rotor assembly. Rear brakes must utilize magnetic
steel vented rotors. Carbon fiber, aluminum, and solid disc rotors will not be
permitted. Drilling, lightening and/or any alteration to the brake rotors or calipers
will not be permitted. Brake rotors of excessive size or weight when compared
to an O.E.M. brake rotor will not be permitted. C. Only stock O.E.M. and/or
DIRTcar approved aftermarket calipers will be permitted. The following calipers
have been approved for competition: a. Wilwood: P/N # 120-7197, 120-13900,
120-13899 AFCO: P/N # 6630311 and 6630310. D. Front calipers must mount solid
to the front spindle. Rear calipers may be a solid mount type or a floating type
design. Both solid and floating type rear caliper mounts must be mounted to the
rear axle housing. When using a floating rear brake caliper, it must be completely
separate from the rear axle housing (birdcage) mount. The floating rear caliper
mount must pivot independently and be supported by one radius rod to the frame
only. E. Brake proportioning (bias) valves and a right front shut off valve
are permitted. 15.9 Wheels & Tires A. The tire rule may
be amended by bulletin. B. The only tires approved for DIRTcar competition
are the Hoosier: M-30S and M-60 compounds, American Racer: Hard and Extra Hard
in the DIRTcar plated tire 26.5/8.0/15 or 27.5/8.0/15. The maximum width of the
tire will be 9 inches. C. The M-60 may be used as a right rear option
tire. D. NO GROOVING allowed. E. Siping permitted on all tires. F.
Recapping of an approved tire is not permitted. G. Any local track and/or
DIRTcar official can confiscate any tire at any time and during any DIRTcar event
to be evaluated and analyzed including verification using a tire durometer. Tires
may also be submitted for further chemical analysis. H. Defacing or altering
any of the manufacturers identification markings, letters, words, numbers,
on any tire will not be permitted. I. Any alteration of tires may result in
immediate suspension from all DIRTcar racetracks and/or events and/or penalties
deemed appropriate by local track and/or DIRTcar and/or World Racing Group Supervisory
Officials. J. Tire softeners and/or chemicals designed to alter the chemical
characteristics of the tire and/or the tire surface will not be permitted. K.
Bead locks will be permitted on the right side only. L. Wheel discs shall
be fastened to the wheel using a minimum of three (3)- 5/16 inch or (3) ¼
inch diameter magnetic steel hex head bolts. M. The use of wheel discs with
any other type of fastener will not be permitted. N. As an option, a wheel
cover with minimum of (5) five steel Zeus fasteners mounting points may be approved.
O. Only 8-inch DIRTcar approved and labeled racing wheels will be permitted.
Wheels must not weigh over 30 pounds P. All wheels must be conventional one-piece
magnetic steel and must be mounted with lug nuts. Aluminum, plastic and/or carbon
fiber wheels will not be permitted. R. All wheels must be fastened to the hub
with five lug nuts. Q. Wheel spacers are permitted. Wheel spacers may only
be manufactured from magnetic steel or aluminum. Exotic, heavy metals are not
permitted. Wheel spacers must not exceed one (1) inch in thickness. Wheel spacers
must not exceed a 6-1/2 inch outside diameter. R. Approved fastening (nut
assembly) systems: a. Keyser Manufacturing Part #100 7-101. b.
Wehrs Manufacturing Part # WM377A-312 Aluminum 5/16 / WM377S-312 Steel
5/16 c. Triple X Chassis Part # SC-WH-7810 (for a 1 spring) /
SC-WH-7820 (for a 1 3/8 spring) d. Pit Stop USA Part #: e. Smith
Precision Products Part # MC-516-18 Tire
protest: Any car can protest a tire and
have it sent to Blue Ridge for testing for $100. Blue Ridge's decision will be
final. All protests must be at the scales and be made immediately after qualifying
and after the feature. Refusal is an automatic disqualification. 15.10
Personal Protection Equipment (See section 3.0 for requirements) Note:
Industry approved requirements in the Personal Protection Equipment will begin
to be introduced into all divisions. When upgrading or purchasing new please consider
the future requirements. 15.11 Roll Cage A. All cars must have
a roll cage. The roll cage must be approved prior to competition and it must be
welded to the frame. The drivers head must not protrude above the top of
the roll cage with B. the drivers helmet on. The top of the roll cage
must extend above the top of the drivers helmet by a minimum of one (1)
inch. The entire roll cage and all roll bar pieces must be fabricated from magnetic
steel a minimum of .095 in thickness. C. The driver and right-side door
bars must be parallel to the ground and located perpendicular to the driver. There
must be right side door bars. The side bars must be welded to the front and rear
of the roll cage. No brazing or soldering is permitted. The door bars must have
a minimum thickness of .095 and must have a minimum of 1-1/2 diameter.
On the drivers side, there will be a minimum of three (3) door bars. D.
Foot protection is mandatory. One piece of magnetic steel tubing, a minimum .095
in thickness, must be fastened and/or welded across the back of the engine with
vertical tubing a minimum of .095 thick. E. The door side roll
bars are mandatory and must extend into the door panels. F. The roll cage
must consist of continuous hoops that are no less than 1-1/2 in diameter
and must a minimum thickness of .095. G. The roll cage must be mounted
securely (welded) to the frame in a minimum of 6 (six) places. H. The roll
cage must consist of a configuration of front and rear hoops connected by tubing
on the sides and/or side hoops. Roll cage must be securely supported and braced.
Gussets to brace any portion of the roll cage will be permitted.
15.12
Other A. All electronic and/or computerized wheel spin and/or acceleration
retardation traction control devices will not be permitted. Controlled timing
devices attached to or controlling accelerator or rotation of wheel will not be
permitted. GPS and/or any other type of electronic tracking and/or locating device
will not be permitted. B. All traction control devices utilizing wheel sensors
and/or any means of measuring ground speed to control wheel spin will not be permitted.
C. Adjustable ping control devices, dial a chip controls, timing controls
or automated throttle controls will not be permitted in cockpit or driver accessible
areas. D.) Adjustable restrictor plates will not be permitted. D. Any remotely
controlled components inside or outside the cockpit of any competitors racecar
will not be permitted. E. Radios or devices for transmitting voice or data
will not be permitted, either in the racecar or on anyone connected with the car.
F. The uses of pit boards or colored flashlights are prohibited 15.13
Series Decals & Patches A. All participants shall display required
decals as provided on decal verification sheet to be allowed to compete. B.
Series Decal on both side of the car is mandatory, Drivers series patch mandatory
to receive point fund distribution. C. To receive any contingency sponsorship
awards, team must meet the requirements of the award such as; decals, patches,
product use, product verification 16.0 Drawings (For all drawings
and diagrams, refer to http://www.dirtcarump.com/wp-content/uploads/2018/01/2018DIRTcarUMPModifiedRules.pdf
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