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Neil Harvey Neil Harvey is offline
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Join Date: May 2004
Posts: 241
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
Sage advice from an expert. Listen to Steve, he's been there, done it and built it!! He is a wise man

Not saying he's old, but I remember when I crewed on the Santa Maria with Columbus, Steve was the navigator.

FYI, audible detonation is the least destructive. It's a lower frequency which the ear can detect. It's the high frequency detonation the ear cannot hear that is the most damaging. I suggest you install a simple knock detection device as well. I have these if you need.
Old 08-21-2018, 04:00 PM
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