Originally Posted by M7H
The only regulations EFRA has and IFMAR doesn't are these 2:
1) Max. 7mm bore in crank
2) End of crankhole near backplate, can have a max. rounding of 0.5mm, (so no turboscoop going into this hole)
On the other hand if Team Orion was running EFRA legal engines, tells me 2 things:
1) they were so convinced of them selves, that they would win the worlds even with an EFRA legal engine (But then just in case would also have an IFMAR legal version ready)
2) they were so stupid NOT to use an IFMAR legal engine, which now even might have cost them the title.....
My point was that these 2 EFRA requirements are considered as restrictions (made to limit performance and/or cost of the engine). Because of it's new technology the CRF engine is not restricted by these requirements. It does not need crankshafts with 7mm+ bore and funky turboscoops to be the fastest engine on the track even when competing with engines which are not EFRA legal.
The crankshaft that was used was the same 6mm crankshaft you get when you buy the engine. Modified cranks were tested but they made the car difficult to handle because of excessive power.