Quote:
Originally Posted by E92Fan
The standard compression ratio of the N54 engine is 10.2:1, whilst Alpina use a 9.3:1 piston in their B3S.
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I know we discussed that yesterday and I don't want to be splitting hairs here (although, you know my profession so I'm usually paid to do that
), but the compression ratio for the Alpina B3S Biturbo is 9.4:1. See here:
Alpina Catalogue (pages 17 and 26).
EDIT: Wanted to add that Alpina also mentions they're running 1.3bar of boost pressure (18.85 psi) which seems incredibly high to me. I wonder what they do to counter the problems of the N54 engine we're seeing here (except the lower compression)?
Master Batman
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Audi R8 LMX, BMW M550i xDrive (G30 LCI); gone: Alpina B3 3,3 (E46), BMW 335i, Audi R8 V10 manual, Audi R8 V10, BMW M235i, BMW 550i F10