john deere g compression ratio

toomanytoys · Aug 11, 2016

How high can I go on compression ratio on a JD G with basically stock parts and aftermarket cam.

molinepuller · Aug 12, 2016

Until head gasket does not hold and compression knock or does not start.

toomanytoys · Aug 12, 2016

Looking for ballpark figure to start with. Right now I'm at 20 to 1 and know that's too high

Dennis Andres · Aug 12, 2016

That's diesel compression!

brutus49DC · Aug 12, 2016

you want to know what kind of compression is possible but you are at 20 to 1? Compression ratios are directly related to the octane rating of the gas you are willing to buy. piston displacement plus clearance volume divided by clearance volume equals your compression ratio

MSD · Aug 13, 2016

Sure you figured that right? We had one at 17:1 and it wouldn't shut off, just dieseled when you tried to shut it off.

JLG · Aug 13, 2016

I had 10-1 on mine. It ran fine on 93, but ran great on 100 octane aviation fuel. Ran it for years with no trouble. I'd say that's the LEAST you want to go on compression. Look up Josh Blackburn, Blackburn Performance Shop in Michigan. He knows Deeres.

john deere g compression ratio

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