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Tractor Pulling Discussion Forum

11:1 in PSI?

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Compression

10-15-2004 15:39:47




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Can anyone tell me about how many psi an 11:1 compression ratio would be? Thanks..




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Drew

10-15-2004 20:00:18




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 Re: 11:1 in PSI? in reply to Compression, 10-15-2004 15:39:47  
There IS NO WAY to relate compression pressure in PSI to compression ratio. Variables in the head and camshaft can change the cranking compression pressure while the mechanical compression ratio remains the same. You could take an engine w/ 14:1 compression and a fat roller cam and have LESS cranking compression than the same engine with a smaller camshaft.



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ChadS

10-16-2004 07:06:01




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 Re: 11:1 in PSI? in reply to Drew, 10-15-2004 20:00:18  
I dont know of any chart either to convert the variables from pressure, to ratio. I dont know if this would be right,, just a guess on this,,,
5:1 100 psi
6:1 120 psi
7:1 140 psi
8:1 160 psi
9:1 180 psi
10:1 200 psi
11:1 220 psi
12:1 240 psi
13:1 260 psi
14:1 280 psi
15:1 300 psi

Now, no way am I saying that is accurate, but relitively close,, ChadS



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