I used Venolia Pistons on the first 911 engine I ever rebuilt. It was 2.2, when my dad and I measured the bores they were ovaled and tapered.. so we had them bored.. An outboard motor guy we knew hooked us up with Venolia.. the engine, after all was said and done was 2.35L The CR was 10.1:1 when measured...
It was a screamer that engine.. Yikes almost 25 years ago LOL I drove it for a few thousand miles, then balled the car up.
10.5 Is probably the max CR unless you commit to high octane, or twin plug heads..
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Shooting for 9:0 to 1... |
go for a measured 9.5