ARTICLE 5 : ENGINE
5.1) Types of engine permitted
Only 4-stroke engines with reciprocating pistons are permitted.
5.2) Maximum capacity
Engine capacity must not exceed 3000cc.
Supercharging is forbidden.
5.4) Number and type of cylinders
The maximum number of cylinders is 12 and the normal section of each cylinder must be circular.
5.5) Number of valves
Engines may have no more than 5 valves per cylinder.
5.6) Temperature and pressure of the charge
5.6.1 - Any device, system, procedure, construction or design the purpose and/or effect of which is any decrease whatsoever of the temperature of the intake air and/or of the charge (air and/or fuel) of the engine is forbidden.
5.6.2 - Internal and/or external spraying of water or any substance whatsoever is forbidden (other than fuel for the normal purpose of combustion in the engine).
5.7) Exhaust system
Variable geometric length exhaust systems are forbidden.
5. Engine materials
5.8.1 - The basic structure of the crankshaft and camshafts must be made from steel or cast iron.
5.8.2 - Pistons, cylinder heads and cylinder blocks may not be composite structures which use carbon or aramid fibre reinforcing materials.
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