Compression Ratios

[low flying aircraft]

Hi guys what is the highest static compression ratio that you have used with boost

[Boosted]

I've seen 15:1 compression on a motor with 28psi of boost .... was a diesel powered Mack truck though, so perhaps not helpful in your situtation.

 

A little more info might get you some more answers. Will depend on the engine and how 'laggy' you can live with. You could run 10:1 compression with 0.2bar boost, or you could run 8:1 with 1.5bar boost.