FYI
If you switch to aluminum, they suck heat outta the chambers, dropping your EFFECTIVE compression ratio.The usual cure is more cylinder pressure.
Maybe you already know this.
Ok, say I believe you.......
So
how come I can run near 200psi on 87E10 with no detonation?
Whereas with iron, the limit is down around 160/165
Both at WOT/optimum timing, and otherwise identical
