Engine Rules
1. 4 cycle multi-cylinder engines not exceeding 600cc with stock bore & stroke with charging unit intact and working.
2. No porting or polishing of heads or cam degreeing. Valve jobs will be allowed as long as they are within mfg. tolerance allowance. Any air cleaner will be allowed. Any exhaust will be allowed. Crank case ventilation to atmospheric pressure only is allowed. All cars must start the race with a muffler.
3. Carburetors must be OEM Production Motorcycle, Cv Style. No Flat sides or Lectron style carburetors allowed.
4. Carburetors may have metering rods, jets and springs changed to tune fuel curve to match the car requirements.
5. There will be no cones in the carburetor or the carburetor boots. TPS sensors not required.
6. Aftermarket timing advancers are not allowed. Predrilled, slotted or altered cam gears and/or bolts, or keys are illegal.
7. Original flywheel must remain in the motor (no lightening of flywheel). All original transmission gears must remain intact and functional. Any motor sprocket (520 or 530) is allowed. Outer cosmetic changes will be allowed to mount the motor in the car (i.e. cut part of the engine off to get it to fit, relocate oil pan drain plug, etc). Except as noted above, no internal metal removal or blueprinting allowed. (E.g. no head milling, porting, polishing or balancing allowed.) Aftermarket cam chain tensioners are allowed.
8. Fuel Injected Engines running Fuel Injection
A. Aftermarket air boxes are allowed. Must run stock number of injectors.
B. Oil pickup modifications are allowed.
C. Outer cosmetic changes to mount the motor in the car are allowed, (i.e. cut part of the engine off to get it to fit, relocate oil pan drain plug, etc).
D. Engines running Fuel Injection may run alcohol or gasoline (alcohol recommended).
E. Power commander module allowed to tune fuel map only.
F. No modules that allow ignition remapping.
G. No MSD-MOTEC-TEC 3 or any other aftermarket ignitions allowed. Must use stock CDI box. No hot boxes are allowed in this class.
H. No performance enhancing additives are allowed! However, top lube is allowed.
9. Fuel Injected Engines running Carburetors
Engines originally equipped with fuel injection (except current year production) are allowed with any OEM production Motorcycle, CV style carburetors and aftermarket filter boxes. Interchanging of Injected and Carbureted cylinder head is allowed. Ignition specs are same as above.
10. Transmission
Stock with all original ratio gears: No Lightening. Must have stock clutch.
11. Fuel
A. “Stock” class cars may run gasoline, ethanol or methanol.
B. No performance enhancing additives are allowed! However, top lube is allowed.
12. ELECTRONIC
Micron data collectors allowed. No traction control or wheel sensors allowed.
13. O.E.M. charging system must remain in the motor and be functional (charging while motor is running!).
14. All cars must be equipped with cockpit operated electrical starter and an on-board battery capable of starting a 600cc multi-cylinder engine. On and off switch must be on the dash, top of cowl, or on the steering wheel. Switch must be connected and functional.
15. Cars must have an operational manual lever clutch.
16. The car must remain chain driven off original counter shaft.
17. Wheelbase is from the center front axle to the center of the rear axle. With a maximum of 70" and a minimum of 50".
18. The width is a maximum of 48" and a minimum of 32" from center of tires; 50" on 1/4 mile or larger tracks.
19. Tires will be Hoosier or American Racer brand tires with a minimum durometer of 50 on the right rear. The right rear must have a compound no less than D35 for Hoosier and MD57 for American Racer.
20. Wheels will not exceed 10" diameter or 14" in width. The only wheel allowed to be 14" is the right rear all other wheels must be 10" or less in width. Wheels may be made of steel, carbon fiber, or aluminum.
21. No cockpit adjustable devices for suspension or brakes. The use of manual or electric wing sliders is allowed.
22. Minimum weight of car and driver will not be less than 780 lbs. Car weight will be determined, with driver, as the cars come off the track, the way they finished the race.
23. Any material used for the purpose of adding to a car's total weight must be firmly attached as part of the car's structure. No liquid or lose ballast, i.e.: water, fuel, oil, sand bags, rocks, and/or log chains etc., allowed. Any added weight shall be painted white.
24. Cars must be equipped with a roll cage. The roll cage shall have gussets at the intersecting bars to the upright. Roll cage must be a minimum of 3" and a maximum of 6" above the driver’s helmet.
25. Roll cages shall be at least:
A. 1 inch .095 wall thickness
B. 1 1/8 inch .065 wall thickness
C. 1 1/4 inch .065 wall thickness.
26. Roll cages shall be made of chromoly steel or equivalent in strength with a 1/8" inspection hole drilled in it for the measurement of the material used. The front section of the cage must be no further back than the steering wheel. Roll cage must have sufficient fore and aft bracing. Bracing must have at least 3" radius. No square or pointed corners permitted.
27. Fabrication of critical parts must be welded. Critical parts are identified as followed:
A. Frame
B. Running gear attached brackets
C. Cowl frames
D. Back rest and fuel tank mount
E. Front axle
F. Steering mechanism
G. Engine and exhaust mounts
28. Cars must have bumpers extending beyond the front and rear tires. Nothing may extend beyond a tangent line from the outside edge of the tires to the bumpers. Nothing may extend behind the outside edge of the tires or wheels, whichever is the widest point. No sharp corners or design so as to hook or damage.
29. There will be no plastic mudguards, side panels, tops, or body encasements allowed.
30. No rear view mirrors, nor any item positioned in such a way that it can be used as a rear viewing device.
31. All cars must have complete bodies i.e.: hood, side panels, and tail pieces must be in place during competition.
32. There must be a metal firewall between driver and engine compartment. The minimum specifications are steel (24 gauge) or aluminum (.0624 thickness).
33. All cars must have legible numbers in color contrasting to the background on both sides of the top wing, rear tail piece, and on the nose wing. Minimum height of the numbers on the nose is 8". Minimum height on the tails and wings are 10". Car numbers are to be separated from advertising so that they will stand out and are readable.
34. Top wing may be no more than 12’ square and a maximum of a 52" side panel. Top wings are mandatory to enter a night’s event, but may finish without one if no replacement is available.
35. Nose wings are allowed and cannot exceed 18” x 24” and must carry car number as described above in #34.
Protest and Claims Procedures
There will be a $1,200.00 “A” Main claim on the first three finishers by the 10th finisher forward. If your motor is claimed, you will retain the:
· complete exhaust system including the exhaust nuts,
· carburetors and/or fuel injection (EFI and/or mechanical) and air cleaners,
· oil pan (if aftermarket),
· coils and spark plug wires,
· CDI (black box),
· voltage regulator,
· wiring down to where it plugs into the motor or into the connectors coming from the motor,
· shift lever,
· carburetor adaptors and boots,
· chain drive sprocket and bolt, plus all of the plates, bolts, etc. required to mount the motor.
The person claiming the motor receives the:
· motor with all stock covers (no aftermarket covers). If no stock cover available, will receive motor without cover,
· oil pan (except if its oil pan is aftermarket),
· starter,
· charging system,
· water neck, and
· head and valve cover intact.
Claims procedures are as follows:
1. No checks. All payments for protest or claims must be cash, cashier check, or money order.
2. Must be made within 30 minutes of completion of the feature or “A” main.
3. Will be taken on a 1st received basis by the President or Vice-President for that night’s event.
4. Top 3 cars to report to tech area immediately after completion of feature, checkered flag has been waved. If any of the top 3 cars do not show up for tech, they will automatically be disqualified for the night.
5. Determination of claims opportunity is based on the placed finished in the feature not final results at the end of the night. Any car or driver disqualified in the top three will not prevent the 4th to 10th finishers to claim.
6. Refusal by car owner/driver to a claim will result in automatic suspension from all BMSA events for one calendar year, however, that car is still subject to tech.
7. Claimed items will be taken at the end of the night of claim at a designated area by the Board of Directors. The exception will be on the 2-night races, and then the claimed item will be taken at the end of the second night. For claims on the first night of racing, all claimed items will be marked. In the event a motor is claimed on the first night of racing and the motor is damaged during the second event all funds will be returned to claimer.
8. Each BMSA current year registered driver (must be a member) may claim only one motor per year. Driver must have raced three consecutive previous races with BMSA before claim is allowed.
*****All motors are subject to tech BEFORE any claim is allowed. If a motor is found to be illegal during this time, the claiming party will be returned all monies related to the claim, and will not be allowed to receive the claimed item.*****
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