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Tractor Pulling Discussion Forum

super m compression

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Author 
ronne

02-07-2005 22:27:25




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whats the compression of a super m? (as checked with a gauge?) how about the same with a lp head? thanks




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Clarence Barenie

02-11-2005 03:18:20




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 Re: super m compression in reply to ronne, 02-07-2005 22:27:25  
stock super-m 4.00 x 5.25, compression ratio
6.1-1 cranking psi 125lb. 200cc's in the 8060d combustion chamber, aproxo 14.87 cc's in head gasket, figuring it crushes to aproxo 52thds,
125psi divide by 6.1-1 =20.49
propane head 135cc's all other number's stay the same. 1081.38 cc's in the barrel + head gasket,
14.87cc's +the lp head 135cc's =1231.2546 divide by cc's above the deck 149.87cc's = 8.21-1
take 20.49 x 8.21-1 =168.33 cranking pressure
should be pretty close !

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