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Tractor Pulling Discussion Forum

compression

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1st a puller

10-23-2006 15:40:35




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what is the optimum compression pressure? i hear and see people talk about compression ratio alot, but its all relative to cam. so say at the 2000 rpm operating, what is the best compression pressure? we have been running in the 175-225 range (jd two cylinders)




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buickanddeere

10-25-2006 08:00:58




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 Re: compression in reply to 1st a puller, 10-23-2006 15:40:35  
As Drew said, it all depends. A large open combustion chamber is more prone to detonation than a small wedge chamber. Different gasolines are blended for small high rpm engines or large slow rpm engines. After a point, more pressure is more trouble than the extra HP it makes if you can keep the engine together. Unimpeded flame travel can mean more HP than a high compression dome that blocks flame travel. Temp and fuel air mixture vary as well in desired comp pressures allowable.

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champspa

10-23-2006 16:29:08




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 Re: compression in reply to 1st a puller, 10-23-2006 15:40:35  
I know of a few J Deere guys who are running in the 200 psi cylinder pressure at cranking speed . this seems to be the desired range



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Drew

10-23-2006 15:56:26




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 Re: compression in reply to 1st a puller, 10-23-2006 15:40:35  
The mechanical compression ratio IS NOT relative to the cam. However, cranking compression PSI IS relative to the camshaft, cylinder head/induction system as well as how fast the starter is spinning the engine during testing. I dont care what anyone tells you, there is no way, no how a relation between mechanical compression ratio and cranking PSI.

Are you asking about PSI for an engine turning 2000rpm, or a two cylinder Deere? I hope and pray they are not one in the same.

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