Re: J.D. Compression
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Posted by MM on May 29, 1998 at 20:36:22:
In Reply to: J.D. Compression posted by Tom J. on May 28, 1998 at 12:39:08:
The compression ratio is very low by automotive standard on these engines. The approximate formula to get from compression pressure to compression ratio is compression pressure (75) divided by atmospheric (14.7) equals 5.1 to 1 is your compression ratio.
Your next question should be is the plug fuel foulled or oil fouled or is the carb. to rich or is oil getting into the combustion chamber? Oil gets into the combustion chamber two ways on old engines valve guides, by the pistons. I hope this helps.
: Does anyone Know what the compression should be on a "A" J.D. I have a "44" styled J.D. that has 75lbs in both cylinders, but fouls the right plug.HELP!
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