Re: Re: J.D. Compression
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Posted by Dave Kolbenschlag on June 02, 1998 at 08:54:39:
In Reply to: Re: J.D. Compression posted by MM on May 29, 1998 at 20:36:22:
: 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! I have a model A with a rebuilt engine and about 75 psi on each cyl so that seems about right. As to plug foweling it has always been a problem with these engines unless you keep them working hard and hot. The present day problems seem to come from todays fuels.
I have gone to Champion D23 plugs (the hottest for this engine) and by really working on leaning out the carb witha lot of trying and adjusting I have gotten to the point where it no longer fouls too much as long as I keep the engine temp above 180 on a standard fuel (gas) tractor. If you do a lot of ideling and wagong pulling etc you just have to clean the plugs. I keep a plug wrench and a wire brush under the seat! Dave
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