Originally Posted by sb_600
Fair enough but it's more than 5hp.... I've got at least 12whp more in my bored m52 (11.5:1 86.5mm pistons, with s52 cams, m50 intake manifold, pulleys) than an s52 with similar bolt-ons... And the s52 still has more displacement... The other advantage is the crazy amounts of torque.
Anyways I'm not criticizing, just offering my $0.02. Should be a good thread as is!
The available option for me was to go with stock 10.5:1 or the JE 11:1 Comp ratio. For you on the m52 it would've bumped the c/r from 10.2:1 to 11.5:1 which is a bit bigger jump in compression then I would've received so it really wasn't worth it.
That 11.5 would have been a suitable improvement, but I couldn't find a source with that C/R piston.
1987 325is(Midnight Tuning Tuned OBD I S52
) - Current Summer Car
2013 Ford Edge - Daily Driver
1985 318i - 1st Car (started it all)