07-13-2014, 08:15 PM
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Lateral-g Supporting Member
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Join Date: Jul 2005
Location: Scottsdale, AriDzona
Posts: 20,741
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Quote:
Originally Posted by Flash68
I disagree with Greg to a point on timing needed. Compression is part of it but the efficiency of the heads/combustion chamber has a big part to do with it.
Based on your theory Greg, tell me why my motor likes 30* timing (13:1 compression) and Rob's FE likes near 40* (less than mine, around 12:1 give or take).It's mostly due to the difference in combustion chamber, valve angle, etc.
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Totally agree with you --- until we toss in the 114 octane.
You can not compare two completely different motors -- all that will tell you is that they are completely different. For many obvious reasons.
A good running MOPAR 440 --- wants 40* total on PUMP gas with good heads. That's NOT a SBC.... or a FORD for that matter. Different motors want different timing.
Quote:
Originally Posted by Flash68
23* headed engines do not run low timing (relatively) like 32* so that is very surprising. 36-38* sounds more like it. I am thinking Joe built in a lot of safety for you? I dunno else why. That doesn't make much sense to me based on what you've shared.
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Good heads -- tight quench -- etc -- my 408 motor ran 34* and made best power. A dyno is going to tell you -- you don't tell it. You find it. The numbers don't lie. It was also running PUMP GAS not 114.
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