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Tractor Pulling Discussion Forum

how high of compresion ratio for a pulling jd B

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Paul

03-07-2004 18:00:50




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am helping a friend build a B(4 5/8" x 6 3/4") srtictly for pulling will not be doing chores.how High can we push the compression, I say about 11 to 1 if it was mine I might even try 12 to 1 but hate to give him bum advice. can we buy good enough fuel for 12 to 1 or back off a bit any experiences. thanks Paul




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Darol

03-12-2004 23:54:54




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 Re: how high of compresion ratio for a pulling jd in reply to Paul, 03-07-2004 18:00:50  
How are you getting your ratio up that high. We are running a set of .090 over M&W's in ours and need more. The way our club rules run, we can't exceed 40HP in our 4000 lb class (1 HP per 100 lbs of weight). I am looking at shaving some off the top of the block...how much can go?
Thanks,
Darol



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a puller

03-07-2004 19:26:40




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 Re: how high of compresion ratio for a pulling jd in reply to Paul, 03-07-2004 18:00:50  
From what I've seen, you don't want to get over 10:1 on a johnny.....cause of the low rpm.....we try to stay at 9.0:1/9.5:1 on our tractors....hope this helps



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