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Flywheels, UK: Flywheel and clutch assembly minimum permitted weight: 13.16kg. (including all flywheel and crankshaft mounting bolts).
Australia, New Zealand (and think South Africa): The flywheel and clutch assembly weight shall be no less than 11.79kg. The assembly is defined as;
‘all the rotating components affixed to the rear of the engine crankshaft excepting the spigot bush/bearing’.,
The US engine regs:
Have allowed an Alloy head to original spec for some time as there was a shortage and the inlet manifold can be polished and ported. Otherwise they have a lot of OE pattern parts which are specified to help keep costs down, valves, head gaskets etc. In recent years a forged piston has also been allow with the aim of getting a 3000 mile engine life span between engine rebuilds. Over all the engines produce about 113ish BHP against our 105ish. On the whole a cheaper experience.
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