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Iciclehead Iciclehead is offline
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Join Date: Jan 2012
Location: Colorado
Posts: 2,902
Originally Posted by Steve@Rennsport View Post
With those cams, you have far too much cylinder pressure below 5200 RPM for 95 RON fuel. Reducing mid-range & total timing will simply kill throttle response and make the engine run too hot.

I would either:

1) Install lower CR pistons (best choice)

2) Install longer duration cams (narrows the effective RPM range, requiring close-ratio gears)

3) Use 98 RON fuel even though its not convenient
Hey there Steve, glad to hear you are alive and kicking!

What is max compression ratio you would go for with the SC cams or what combination would work?

I am planning on 10.3 cr with DC35 cams on my 3.4 and hoping not to have the issue of the OP.

Must admit I always thought that twin plug was a panacea for pinging on 911 engines....yoiks!

Old 08-21-2018, 02:14 PM
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