2010 MODIFIED RULES
Weight Rule: 2450 pounds
ARTICLE
4: BODY
4.1 1970 or newer American compact passenger cars only. No
panel vans or station wagons.
4.2 An aluminum half-windshield may be used on driver’s side
of the front window opening only.
4.3 Stock appearing front window support units must be used
(painted roll bars are not acceptable substitutes). Front window may have a
support of no more than six (6) inches at bottom, going straight up to top for
non-clear materials. Support may be up to ten (10) inches at bottom, going
straight up to top, only if it is a clear Lexan material.
4.4 A minimum window opening of twelve (12) inches must be
maintained on both side window openings.
4.5 Streamlining at top of windshield is not allowed. Bodies
must have standard appearing windshield opening and corner post must follow
standard configuration.
4.6 Original roof line of vehicle must be maintained with a
maximum of five (5) inches of slope from rear to front. No more than one-half
(1/2) inch stiffener allowed at the rear of the roof and must turn down
perpendicular to the ground. O.E.M. Gremlin roofs are not allowed.
4.7 Sail panels must be of matching design with matching styles
on both sides of racecar.
4.8 No belly pans. A belly pan will be defined as any object or
material that alters the airflow under the racecar.
4.9 No panel in front of the right door next to the engine
compartment.
4.10 No racecar will be allowed to compete with excessive body
damage (to be determined by an official).
4.11 Spoilers:
4.11.1 A maximum rear spoiler height of six (6) inches. NOTE: This rule is subject to change during the 2009 season if the USMTS deems that more parity between engine combinations is warranted.
4.11.2 Rear spoiler may not exceed the width of the rear deck lid and must be flush to the deck.
4.11.3 A maximum of two (2) center supports and a maximum of two (2) side supports may be
attached to the front of the rear spoiler. Supports may extend up to two (2) inches above and behind the rear spoiler. Each support may be a maximum of twenty (20) inches in length and must angle back from three (3) inches in the front. Supports may not be squared and may not be longer than twelve (12) inches before the break to angle to three (3) inches. If running adjustable spoiler, supports may not be more than two (2) inches from any spoiler angle. See Body Specifications diagram (Appendix A) for measurements and template.
4.11.4 Fins, wings or other air spoilers (except as noted above) are not allowed.
4.12 The rear deck lid and/or trunk area must be covered.
4.13 Aluminum roofs are allowed.
4.14 Doors and quarter panels may be mounted a maximum of one (1) inch above the deck.
4.15 Excluding hood and nosepiece, the top of the body should extend no further forward than the back of the engine block. The bottom of the body may extend up to eight (8) inches forward of the back of the engine block.
4.16
Nose may not extend past front bumper and must be a minimum of seven (7) inches
above the ground. A two (2) inch lip on the nose is permitted, but may go no
further than leading edge of hood.
4.17 Bumpers:
4.17.1 Both front and rear bumpers must be used, and must not
have any sharp edges. Any inappropriate bumper will be disallowed by an
official. Front bumper should be mounted from frame-end to frame-end with the
bottom loop parallel to ground. Bumpers must be made of a minimum of one and
one-quarter (1-1/4) inch tubing and must be able to support the racecar if
lifted by a tow vehicle.
4.17.2 Rear bumpers may be constructed of tubing or flat stock,
and must protect the fuel cell. Center of bumpers (both front and rear) must be
at least sixteen (16) inches from the ground and no more than twenty (20) inches
from ground. Rear bumpers may be no more than two (2) inches wider than the body
on each side and may not be open-ended (must wrap around and be connected to
side rail bars).
4.18 Appearance:
4.18.1 All racecars must be numbered with large legible numbers
on both sides, on top and on the nose and real panels. Numbers on the sides of
the racecar should be in contrasting color from the body and be at least four
(4) inches thick and at least eighteen (18) inches high. Top numbers should be
at least four (4) inches thick and twenty-four (24) inches high.
4.18.2 Officials reserve the right, in the public image of the
sport and/or the USMTS, to assign, approve or disapprove any advertising,
sponsorship or similar agreement in connection with any event. All cars must be
neat appearing and are subject to approval of officials to compete. By competing
in an event, all drivers agree to comply with the decisions of officials in this
regard.
4.19 Overall width of the racecar may not exceed 78 inches. Width shall be measured from the
widest points on each side of the racecar.
ARTICLE
5: ROLL CAGES
5.1 Round steel tubing, seamless roll-over bars are required
for the basic roll cage, and must be acceptable to officials. Acceptable tubing
is as follows: one and three-quarters (1-3/4) inches by nine-tenths (.090) of an
inch or one and on-half (1-1/2) inches by ninety-five one-hundredths (.095) of
an inch for mild steel and DOM tubing (one and three-quarters (1-3/4) inches by
eighty-three one-hundredths (.083) of an inch for chrome-moly tubing). Aluminum
and/or other soft metals are not allowed. Roll bar connections must be properly
welded.
5.2 Roll bars within the driver’s reach must be padded with
an accepted material as determined by an official. Fire retardant material is
highly recommended.
5.3 Installation and workmanship must be acceptable to
officials.
5.4 Must be frame-mounted in at least six (6) places.
5.5 Must consist of a configuration of front and rear hoops
connected by tubing on the sides or side hoops.
5.6 With helmet on and driver securely strapped into the racing
seat, top of driver’s head must not protrude above the roll cage.
5.7 Must have a protective screen or bars in front window
opening in front of driver’s face.
5.8 Protection of driver’s feet utilizing a bar across the
back of the engine with vertical bars and rub rails or similar protection is
mandatory.
5.9 Brace bars forward of roll cage may not be higher than the
stock hood height x eighty-three one-thousandths (.083) inch for hood height.
5.10 A minimum of three (3) driver side door bars must be
parallel to ground and located perpendicular to the driver so as to provide
maximum protection for the driver, but without causing undue difficulty in
getting in or out of the racecar. Side bars must be welded to the front and the
rear of the roll cage members. Door bars with a thickness of less than
nine-tenths (.090) of an inch should have four (4) bars at least one and
one-half (1-1/2) inches in diameter at a minimum of eighty-three one-hundredths
(.083) of an inch thickness and be gusseted in place. The door bars must have
six (6) vertical studs per side of one and three-quarters (1-3/4) inches by
eighty-three one-hundredths (.083) of an inch minimum seamless round tubing
equally spaced.
ARTICLE
6: FRAME
6.1 Factory production complete full 1960 or newer parallel
American passenger car frames only. Frames may be cut in rear only at a point
not further than thirty-six (36) inches from center of rear end housing.
6.2 May only be altered for the installation of springs and
shocks.
6.3 All components must be made of steel and be properly
welded.
6.4 Must be full and complete on both sides, may not be widened
or narrowed and must be able to support roll cage on both sides.
6.5 Minimum height from ground is four (4) inches. Exception:
Front cross member may be notched for radiator clearance only.
6.6 No Jeep, Bronco or similar four-wheel drive frames allowed.
No sports car frames allowed. No front-wheel-drives allowed.
6.7 Rear of frame may be altered to accept leaf or coil
springs.
6.8 No hydraulic, ratchet or electric weight jacks anywhere on
the racecar. Aluminum jack bolts are not allowed.
6.9 Minimum wheelbase must be one-hundred eight (108) inches on
both sides (no tolerance).
6.10 Tubular front clips are not allowed.
6.11 Maximum overall width of car (at front or rear) shall not
exceed seventy-eight (78) inches from outside of tread to outside of tread (no
tolerance).
6.10 Tubular front clips are not allowed.
ARTICLE
7: COCKPIT
7.1 Loose objects and/or weights are not allowed.
7.2 Air bags are not allowed.
7.3 Rear view mirrors are not allowed.
7.4 Floor and firewall must be complete in the driver’s
compartment. No interior sheet metal can be higher than or enclose a standard
window opening. Sheet metal in the driver’s compartment must be horizontal
from the top of the driver shaft tunnel to the right side door bars or angle
from the top of the drive shaft tunnel upwards to the top of the right side door
bars. Driver must be able to exit the racecar from both sides. Any driver caught
with a double firewall in cockpit is subject to deeper inspection.
7.5 Steering:
7.5.1 Must be O.E.M. and remain within original bolt pattern
for type of frame used.
7.5.2 Rack and pinion is not allowed.
7.5.4 May be modified to suit driver, but must remain on left
side of cockpit (no center steering).
7.5.5 Quick-release metal coupling on steering wheel is
mandatory. Plastic couplings are not allowed.
7.6 Seat:
7.6.1 Factory-manufactured racing seats are mandatory, and must
be acceptable to officials.
7.6.2 Homemade aluminum, plastic or fiberglass seats are not
allowed.
7.6.3 Must be properly installed and seat back cannot be moved
back further than rear edge of quarter post.
7.6.4 High-back aluminum seats only.
ARTICLE
8: SUSPENSION
8.1 Must remain stock-type for the type of frame being used.
Steel aftermarket parts may be used as stock components as long as they mount in
the stock location and are the same size as the O.E.M. parts.
8.2 No aluminum or titanium components allowed. Magnet must
stick to all components.
8.3 Steel tube-type upper A-frames allowed and can be moved.
8.4 Aluminum cross shafts and wedge tubes are permitted.
8.5 Stock passenger car spindles only - no fabricated spindles.
Bottom A-frames cannot be altered, lightened or moved.
8.6 Front sway bars may be used. Front sway bars must be made
of steel and may be attached to the bottom A-frame using steel heim joints. Sway
bars must be solid full-length O.E.M.
8.7 Rear panhard bars may be used. Rear panhard bars must be
made of steel and may be attached by using a minimum three-quarter (3/4) inch
i.d. steel heim joint.
8.8 Steel coil-over eliminators or steel/aluminum coil-over
kits are allowed, but must conform to shock and spring rules.
8.9 Suspension or rear end parts must be steel. Aluminum
mounting brackets are permitted.
8.10 Shocks & Springs:
8.10.1 One shock per wheel only.
8.10.2 Air shocks are not allowed.
8.10.3 All coil springs must be at least four and one-half
(4-1/2) inches outside diameter. Steel springs only. No torsion bars allowed in
rear.
8.10.4 Canister shocks are not allowed.
8.10.5 Shocks shall be subject to claim, as outlined in Claim
Procedures (Article 19).
ARTICLE
9: ELECTRICAL SYSTEM
9.1 Battery:
9.1.1 Must be securely mounted.
9.1.2 One (1) 12-volt battery only (no 16-volt batteries).
9.1.3 Voltage converters are not allowed.
9.2 Ignition:
9.2.1 Magnetos or crank-triggered ignitions are not allowed.
9.2.2 No more than one (1) coil may be used.
9.2.3 Kill switch required within easy reach of the driver. The
switch must be clearly marked “off” and “on”.
9.2.4 MSD ignition boxes shall be subject to claim, as outlined
in Claim Procedures (see Article 19).
ARTICLE
10: FUEL SYSTEM
10.1 Fuel:
10.1.1 Must be automotive gasoline or alcohol only. No additives of
any kind. E85 ethanol or racing fuel is permitted. Penalty for illegal fuel is
loss of points, cash and awards earned for that event.
10.1.2 May not be blended with ethers or other oxygenates, and
may not be blended with aniline or its derivatives, nitro compounds or other
nitro containing compounds.
10.2 Electric fuel pumps are not allowed.
10.3 Carburetor:
10.3.1 One (1) two-barrel, one (1) four-barrel or one (1)
Predator carburetor properly installed will be permitted.
10.3.2 Must be naturally aspirated.
10.3.3 No fuel injection.
10.4 Fuel cell:
10.4.1 Must be commercially manufactured and must be mounted
utilizing at least two (2) steel straps. Straps must be two (2) inches wide at
all measuring points.
10.4.2 Must be enclosed in a steel container and must be
protected in rear of axle by roll cage tubing mounted securely.
10.4.3 No part may be lower than protective tubing. Protective
tubing must be no wider than six (6) inches on both sides.
10.4.4 Must have check valves.
10.4.5 Limited to a maximum capacity of thirty-two (32)
gallons.
10.4.6 Must have check valves. A ball-type, flapper or spring or filler rollover valve is mandatory for fuel cells without a positive seal filler neck/cap system.
ARTICLE
11: TIRES & WHEELS
11.1 Wheels:
11.1.1 Must be fifteen (15) inches in diameter and eight (8)
inches in width.
11.1.2 Stickers are not required.
11.1.3 Must be reinforced steel only.
11.1.4 A steel or aluminum bead lock may be used on the right
front and right rear wheels only, and may be mounted on the outside of the wheel
so long as it does not add over three-quarters (3/4) of an inch to the overall
width of the wheel.
11.1.5 Homemade
mud caps are not allowed.
11.1.6 Wheel covers are allowed on right side wheels only.
11.1.7 Wide five wheel adaptors are not allowed.
11.1.8 Steel or aluminum spacer between hub and wheel is
allowed, but overall width of racecar cannot exceed seventy-eight (78) inches.
(see Rule 4.20).
11.1.9 Aluminum or steel lug nuts are allowed.
11.2 Tires:
11.2.1 American Racer G60 or KK-704 (stamped or non-stamped)
tires are allowed. All non-stamped tires must be asphalt (no dirt). Some events
may allow an alternative tire. Check your entry form or call (515) 832-7944 to
verify.
11.2.2 Softening is not allowed. Any driver caught softening
tires shall be fined, suspended and shall receive no points money. Refer to Rule
2.16.4 for clarification.
11.2.3 Grooving and siping is permitted.
11.2.4 Recaps are not allowed.
ARTICLE
12: BRAKING SYSTEM
12.1 Must be operating on all four wheels and must lock up all
four wheels during inspection.
12.2 Must have caliper and rotor on all four wheels. Vented
rotors are required on front wheels.
12.3 Electronic brake actuators are not allowed.
12.4 Calipers may not be lightened and must be O.E.M.
12.5 Steel or aluminum single-piston O.E.M.-type calipers are
allowed.
12.6 Rotors must be steel and may not be lightened or drilled.
Rotors may be re-drilled for different bolt patterns or larger studs.
12.7 Front-to-rear or let-to-right (but not both) brake bias is
allowed.
12.8 Brake shut-offs are not allowed.
12.9 Brake lines must be visible.
ARTICLE
13: DRIVE SHAFT
13.1 A loop is required and must be constructed of at least
one-quarter (1/4) inch by two (2) inch solid steel. Loop must be mounted no more
than six (6) inches from the front of the drive shaft tube. Alternatively, two
(2) loops of one-quarter (1/4) inch by one (1) inch solid steel fastened to
cross member are allowed.
13.2 Must be painted white and made of steel.
13.3 Must be made of steel.
ARTICLE
14: TRANSMISSION
14.1 O.E.M. three-, four- and five-speed and automatic
production-types allowed.
14.2 “In and out” boxes are not allowed.
14.3 Must all be clutch-operated.
14.4 Bert and Brinn transmissions are allowed. With motor
running and racecar in stationary position, driver must be able to engage
racecar in gear and move forward, then backward, at time of inspection.
14.5 Clutch must be inside of bell housing for O.E.M.
production-types.
14.6 One (1) forward gear and one (1) reverse gear must be in
working order, plus a neutral position, and must be able to be shifted by
driver.
14.7 Clutch-type transmissions must be equipped with an
explosion-proof steel bell housing. Aluminum must be SFI-approved (GM bell
housing is not SFI approved).
14.8 Automatic, Bert or Brinn transmissions must have a guard
two-hundred seventy (270) degrees around flex plate or flywheel, and must be
constructed of at least one-quarter (1/4) inch steel. Alternatively, automatic
transmissions may utilize an SFI-approved aftermarket guard.
14.9 All racecars must have the capability of starting without
being pushed or pulled.
ARTICLE
15: REAR END
15.1 Any passenger car- or truck-type is allowed. No aluminum
allowed except lowering blocks, axle cap and drive plate.
15.2 Quick change is optional: Steel tubes only; ten (10) inch
ring gear only; pinion and carrier bearings must be tapered; titanium is not
allowed; wide-five wheel patterns are not allowed; aluminum spools are
permitted. Magnesium will be permitted until such date that the cost increases,
at which time only magnesium rear ends purchased prior to that date will be
permitted and must have original serial number.
15.3 No cambered rear ends (one-piece drive flange only).
15.4 No traction devices allowed (includes Gold Track, True
Track or similar type components).
ARTICLE
16: ENGINE
16.1 Must be able to be used in conventional passenger car
without alteration. Motor mounts may not be removed or altered. Castings and
fittings may not be changed. Machine work on outside of engine, or on front or
rear of camshaft, is not allowed.
16.2 No total “dry sump” systems allowed. “Wet” system
must be operative.
16.3 Cooling system may be modified. Radiators and oil coolers
must not protrude above interior.
16.4 Any American make may be used. Rear of engine (bell
housing flange) must be mounted at least seventy-two (72) inches forward from
the center line of the rear axle - no tolerance.
16.5 Offset must be within two (2) inches of centerline of
front cross member.
16.6 Must be a minimum of eleven (11) inches from ground to
front center of crankshaft.
16.7 Steel blocks only – no aluminum or titanium.
16.8 Overflow tubes must be directed toward the ground and
inside the frame rails.
16.9 Radiator must be mounted in front of engine.
16.10 Wiring elements must be accessible for technical
inspection. Any racecar advancing spots and missing will be subject to
disqualification.
16.11 Tri-Y headers are permitted, but cannot contain stainless
steel.
16.12 Exhaust system and/or mufflers must be mounted in such a
way as to direct spent gases away from the cockpit and away from areas of
possible fuel spillage.
16.13 Mufflers are recommended. Mufflers may be required at
some events.
16.14
Engine type shall determine overall
weight of racecar (see Rule 17.1)
16.15 Flat Tappet/Steel Head Engines:
16.15.1 Stock diameter lifters only. Mushroom lifters are not
allowed.
16.15.2 Stud girdles and shaft rockers are allowed.
16.15.3 Engine components must be of matching manufacturers
(i.e. Chevy for Chevy).
16.16 Brodix
Aluminum Spec Head Engines:
16.16.1 Approved product numbers for the BRODIX Aluminum Spec
Head are as follows: SP CH USMTS/USMTS (Chevrolet), SP FO USMTS/USMTS (Ford) and
SP MO USMTS/USMTS (Mopar). For more information, call BRODIX at (479) 394-1075
or visit www.brodix.com online.
16.16.2 Roller cams are permitted.
16.16.3 Removing, relocating, grinding, polishing or defacing
of any cast letters or numbers is strictly forbidden.
16.16.4 May be angle milled, but valve angle must remain within
one (1) degree of original manufactured specification.
16.16.5 Valve guides must retain original angle and spacing as
manufactured. Valve guides may not be tapered, thinned or shortened whatsoever.
16.16.6 Absolutely no welding or adding material of any kind.
16.16.7 Removal of material is not allowed, except for pushrod
clearance. Factory CNC chamber may not be altered in any way.
16.16.8 Absolutely no enlarging, relocating or other altering
of any bolt hole, dowel hole or threaded hole, except to spot face bolt holes
after angle milling.
16.16.9 Heli coils may be used for repairs.
16.16.10 Absolutely no grinding or polishing of any kind on the
casting, except for pushrod clearance.
16.16.11 Internally repaired Brodix
Aluminum Spec Head must be recertified by Brodix.
16.16.12 Brodix
Aluminum Spec Head checking fixtures will be used by officials to check all
specifications and dimensions.
16.17 Other Engines
16.17.1 Roller
cams are permitted.
16.17.2 SB2 motors are not allowed.
ARTICLE
17: WEIGHT
17.1 Gator & 105 Motorspeedway's
minimum overall weight of the racecar
must be two-thousand four hundred fifty (2,450) pounds.
17.2 Ballast:
17.2.1 May not be mounted in cockpit, or outside of body or
hood area.
17.2.2 Must be securely mounted, painted white and clearly
marked with the car number.
17.2.3 Must be attached with at least two (2) one-half (1/2)
inch bolts.
17.2.4 May not be attached to rear bumper.
ARTICLE
18: SAFETY
18.1 It is recommended that each racecar have built-in fire
extinguishing equipment, but cannot be of the dry powder type (must be Halon
1211 or equivalent).
18.2 Drivers should have in their pit area as part of their
equipment, at all times, a fully charged dry chemical, Halon (or its equivalent)
fire extinguisher. Ten (10) or thirteen (13) pound fire extinguishers are highly
recommended.
18.3 Driver must wear required helmet, fire suit and five-point
safety harness whenever the racecar is on the racetrack. This includes during
track packing, warm ups, hot laps and races.
18.4 Helmets are mandatory and must be an approved SHCA or
Snell-type full coverage.
18.5 Helmets should accompany driver and racecar at time of
inspection.
18.6 Helmets of at least Snell SA2000 or SA2005 rating are
mandatory.
18.7 Complete one- or two-piece fire suits of a flame retardant
nature must be worn by all drivers at all times when the racecar is on the
racetrack. This includes during track packing, warm ups, hot laps and races.
18.8 Fire-resistant gloves and shoes are mandatory.
18.9 Five-point safety belts, sub-belt and shoulder harness is
required. Factory-type shoulder belts or straps are not allowed.
18.10 Metal to metal buckles are required on shoulder and seat
belts.
18.11 Shoulder harness must be mounted securely to the roll
cage. It is recommended that seat belts and shoulder harnesses not to be more
than one (1) year old.
18.12 Where the belt passes through the seat edges, it must
have a grommet installed, be rolled and/or padded to prevent cutting of the
belt.
18.13 Full-size window net mounted in the left side driver’s
window opening is required. Window net mounts must be welded to the roll cage.
All bars around the driver must have approved roll bar padding. Approved racing
arm restraints are recommended.
18.14 Fire-resistant safety neck collars are mandatory
APPENDIX
A: BODY SPECIFICATIONS
http://www.usmts.com/images/2009_body_specs.jpg
GATOR EXCEPTIONS:
Claiming/Protests:
We will not allow claiming at a weekly show. Gee General Rules for protest information.
