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Re: M engine - How would you build it?
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Posted by mark on August 08, 2007 at 09:37:10 from (172.136.6.151):
In Reply to: Re: M engine - How would you build it? posted by georgeky on August 08, 2007 at 08:42:54:
Fellers, I have a question concerning these 'high compression' set ups. First, just how high is the compression? If it is below 8:1, I find it hard to believe you need hi octane gas. I also find it hard to believe you are operating at anything over 8:1 at the most, unless you are using some kind of tricked out after market puller heads and pistons. These old tractors, even with high altitude pistons/heads etc., were designed to run on low octane gas from the get go and hi-octane pump gas didn't become regularly available until the very late 50's when Chevy and Chrysler pushed compression ratios over 9:1. The so called good gasolines hit the pumps in the 60's when compression ratios went to 10 and above. If you feel you have to have high octane gas, go down to the local airport and buy 100 octane Av gas. They have it in low lead and no lead versions. Hardened valve seats and unleaded gas are the best things that ever happened to internal combustion engines. High octane is great if you have high compression to get the good out of it....any of these farmall engines pushing 9:1 or above?
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