This is a publication from the United States Auto Club describing the rules for the participants. Items discussed including the engine protest rules, engine suspension rules, general rules, tech procedure, carburetor, engine cooling shrouds, cylinder head, head gasket, valves, springs, valve springs, intake and exhaust ports, engine block, flywheel, fan, and ignition system, gear box & racing gear, crankcase cover, piston notes, crankshaft, camshaft, tappets, and the procedure for checking timing.
The Tech Procedure :
Modifications or machining of any parts in order to bring them to stated minimum or maximum specs (blueprinting) is not legal.
1. External visual check of engine for required components: muffler, shrouds and sheet metal, oil level sensor (this can be partially observed from outside).
NOTES:
Factory air cleaner must be removed. Any air filter may be attached to the outside of air filter adapter. Outer wear style or equivalent can be used over carburetor only with no adapter. The approved air filter adapter may be run with or without an air filter. Any air filter may be used with adapter as long as there are no devices inside the air filter or adapter. (I.E. Springs not allowed) Hose from valve cover must go into a catch can. (We are using “outerwear” to define a style not brand name).
A. The use of air filters during qualifying at asphalt and dirt events is illegal. The Senior Tech. Official reserves the right to allow filters at any event that it’s deemed necessary. Senior Tech. Official reserves the right to allow filters at any event that it’s deemed necessary.
B. Any type throttle linkage may be utilized. Carburetor will be unaltered with the exception of the black plastic piece on upper end of throttle shaft, this is the only part in the carburetor that can be altered, and #82 maximum jet size.
C. Rear mounting brackets for Honda fuel tank may be removed.
D. The starter cup that is behind the flywheel retaining nut can be cut away to leave only the flat washer back piece that retains cooling fan.
E. The keyed end of the ring gear shaft may be shortened, drilled and tapped or machined for snap.
F. Heli-coiling threads for shrouds (all), valve cover, existing throttle mounting holes, oil drain, and fills holes, one of the coil bolts, and side cover bolts is allowed. Dowel holes are not to be modified or relocated, also one carburetor mounting bolt.
G. Honing and deglazing of the bore is allowed.
H. Lapping the valves is allowed.
I. Blocking Airflow: No device may be used that will/or appear that it may impede airflow into the engine cooling system. This may require that the engine be run at a speed above idle by the tech personnel at the scale after the car has qualified or raced.
source : www.usacracing.com
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