Mod Mini Rules

Vehicle Description

1)   Any American or foreign production economy sedan, coupe, station wagon or pick-originally equipped with a four cylinder engine. No all-wheel drive, rear or mid-engine cars. Maximum wheelbase is 100.5” Exceptions to the wheelbase rule may be made on some stock mini-trucks that may exceed the 100.5” limit.

2)  Vehicles must be completely stripped. No factory interior, no chrome, absolutely no glass anywhere, no lights etc.

Engine, Carburetion, Ignition

1)   Water cooled, in-line four cylinder production engines only.

2)   2600cc Maximum Displacement.

3)   OEM heads and blocks only. Crossbreeding of head, block and internal parts is allowed if they can be bolted together without alteration.

4)   Cylinder Head porting and polishing permitted.

5)   Two Valves per cylinder Maximum.

6)   Single Camshaft only. Camshaft specs open.

7)   Roller Rockers or roller Cams not permitted. Adjustable Cam devices OK.

8)   Valve Springs, Retainers and valve size open.

9)   No Titanium Permitted anywhere in valve train.

10) No purpose Built race engines, i.e. Cosworth, Indy, etc.

11) Header will be allowed. Cockpit Exhaust OK if shielded from driver. No exhaust may invade driver’s side of cockpit.

12) Stock or aftermarket pistons may be used.

13) Connecting Rods must be ferrous.

14) No Dry Sump oiling. No external pump oiling. Stock, homemade or aftermarket wet sump pans allowed.

15) Must use a single Two Barrel downdraft Carburetor that flows less than 501 CFM. A stock, modified or aftermarket intake manifold is OK.

16) There shall be at least two throttle springs on the carburetor. Each of them shall be able to close the throttle without the other one.

17) Fuel injection, turbo charging or supercharging shall not be allowed. Vehicles originally equipped with fuel injection must be adapted to run a carburetor.

18) Ignition will be stock or aftermarket. No magnetos. Distributors
may be locked out for advance system. Aftermarket coils allowed. Any type distributor may be used.

19) Vehicle must weigh at least 1lb. per cc. of engine being used including driver after race.(2300cc engine, vehicle must weigh a minimum of 2300 lbs at post race inspection.) no adding weight or fluids after race. Previously registered RFR tube frame cars with stock front clip will be permitted but with weight penalty of 300lbs.  ex. 2000 cc tube frame car must weigh 2300lbs after main event after main event with driver.

Drive train and Brakes

1)   Single Disk, Stock Appearing Clutch only. No Ram couplers etc. No direct drive.
B Automatic Transmissions must have a functional OEM torque converter.

2)   Stock, Lightened or aftermarket flywheel OK, Must be steel. No Aluminum Flywheels allowed.

3)   A 180 degree Scatter shield must be installed underneath or over the floorboard using a minimum 1/8 inch steel plating to protect the driver’s legs.

4)   Driveshaft must be painted white. No aluminum Driveshaft’s.

5)   Rear-end shall be stock type only. Make and model of reared may be changed.

6)   No aftermarket or quick-change rear ends allowed.

7)   Open, Limited Slip, Welded or otherwise locked rear ends shall be allowed.

8)   Must have working brakes on at least three wheels. Locking the rear-end does not constitute as one brake.

9)   Adjustable brake proportioning valves OK. Pedals open.

10) In-cockpit steering may be modified to suit driver’s taste, but must be kept on the left side of the cockpit. No center steering.

4 Roll Cage Construction

1)   Shall be at least a six-point cage with four uprights connected at the top.

2)   Main Cage must be constructed of 1-1/2” diameter tube with .095” wall minimum. Shall not consist of black iron or galvanized pipe.

3)   Must completely enclose the driver.

4)   Minimum of 3 Horizontal door bars on Drivers side and 2 Door bars on passenger side. Driver’s door must be plated with a minimum 18 gauge.

5)   Roll Cage Must secure to the frame or floor pan on unibodies cars by welding solidly around each upright bar or by welding each upright bar solidly to a 6” X 6” by 1/4’ plate then welding or bolting this plate solidly to the floor.

6)   Gusseting on all bar junctions recommended.

7)   Roll cage must have a vertical bar in front of windshield.

8)   Roll bar padding is mandatory where driver can come in contact with the cage. All roll bar padding in driver’s
compartment must be fire retardant.

Body, Frame and Suspension

1)   No tubing or purpose built racing chassis permitted. Frame must remain stock OEM. Stock Frame and unibodies may be reinforced with steel tubing front to rear subject to techman approval. Previously registered RFR tube frame cars with stock front clip will be permitted but with weight penalty added.

2)   Must use OEM control arms and spindles in front suspension. C. Weight Jacking devices are allowed. No cockpit adjustable weight jacking devices allowed.

3)   Any shocks may be used including coil overs. May be relocated to a better location. One shock or strut per wheel only.

4)   Suspension mounting points may be altered but suspension must mount in the stock manner for the chassis being used.

5)   Stock or aftermarket bodies OK. Minimum 22 gauge steel or aluminum body, hood and roof panels. No fiberglass bodies. Fiberglass roof OK. Body must be firmly attached to secure mounting points. Aftermarket nosepiece of plastic, fiberglass or rubberized materials OK.

6)   No aerodynamic air dams, wings etc. Subject to techman approval.

7)   Spoilers OK. Limited to 6” in height as measured off the top of deck lid.

8)   Nerf Bars OK provided that they are no farther than 2” from body of the vehicle. Ends must be bent in to prevent catching. J. Drivers compartment must be safely sealed from the engine bay, fuel cell and exhaust. Right side of driver’s compartment may be boxed off to allow the exhaust system in this area.

Tires and wheels

1)   Any type steel wheel with a maximum of 8”. Any offset allowed.

2)   Bead lock permitted on right rear only.

3)   Tires must be DOT radials or Towel City re-tread DOT tires with a compound of 66 or harder only.

4)   No spiked or studded snow tires. No heavy lug snow tires allowed.

5)   Grooving and sipping permitted.

6)   Tread as measured across the tire cannot exceed 8.5”

7)   1” lug nuts required.

8)   Wheels spacers must not exceed 1” thick.

9)   Tires must not protrude more than 2” past body work.

10) Any chemical substance which alters the tire(s) factory traction characteristics (e.g. - tire softener) is not allowed.

Fuel

1)   Pump or race gas only. No methanol or nitro methane.

2)   Racing Fuel cell required.

3)   Racing Fuel Cell and containers may extend below the trunk floor but must be contained in a fully enclosed box made of minimum 20
gauge steel. Maximum 16 gallons.

4)   Any fluid transfer through the cab must be shielded from the driver. Subject to techman approval.

5)   Vehicles running and electric fuel pump must have a functioning inertia switch.

6)   Fuel Cell protection bars recommended. Fuel cell will be located within body and centered near the original gas tank.

7)   A positive locking filler cap must be used. Breather vents must be designed so that fuel will not escape if vehicle is upside down.