compression raito

[xaero]

what's the highest compression piston i can run on 93 octane pump gas?

 

[jamesA]

I believe that E said 12 is the highest on 93-94 octane, anything with 13s you'd need race gas.

 

[phunky.buddha]

My personal street driven builds:

12.6:1 on 92 octane, low 12:1 a/f ratios
12.4:1 on 93 octane, mid 13:1 a/f ratios
12.77:1 on 93 octane, low 12:1 a/f ratios (current)

You can run in the 13s if you really want to. It's all about the tuning.