[mkoesel]

Originally Posted by 1azycat

https://www.alpina-automobiles.com/e...echnical-data/

Looks like S58 with more torque than in the X3m competition. Same compression ratio as the S58. Same bore and stroke as S58 too. 84x90mm vs 82x94.6mm of the b58.

Great point - I had forgotten that they changed the bore dimensions of the S58 from the B58 it is based upon. That's a first for a turbocharged M engine, BTW. The S55 and S63 share their bore/stroke with the N55/N63 respectively.

Good catch on the compression ratio, too.