Appx. Compression pressure chart

kzz1p
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One Test Is Worth A Thousand Expert Opinions!

27 Jan 2009 15:26 - 27 Jan 2009 16:26 #260512 by kzz1p

Appx. Compression pressure chart was created by kzz1p

I have had this chart for years and years. I got it out of a motorcycle repair book.It is Approximate Compression Pressure while cranking slowly.I am not saying it is correct or ture. Just something to think about when buying cams or changing cam timing.Find your compression ratio across the top and the "Closing" of your intake valve down the left side of the chart.

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Last edit: 27 Jan 2009 16:26 by kzz1p.

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kzz1p
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01 Apr 2009 12:17 - 01 Apr 2009 12:20 #277432 by kzz1p

Replied by kzz1p on topic Appx. Compression pressure chart

By Bob Greene and the editors of Motorcyclist Magazine (1973)

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Last edit: 01 Apr 2009 12:20 by kzz1p.

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mark1122
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Keep twisting it

01 Apr 2009 12:50 #277443 by mark1122

Replied by mark1122 on topic Appx. Compression pressure chart

Those #'s do seem high. i have 10:1's , intake closes at 60* abdc. so i should have 238psi.
I'll let you know what i get after the restart.

76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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Appx. Compression pressure chart

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