Appx. Compression pressure chart

kzz1p
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Appx. Compression pressure chart

27 Jan 2009 15:26 - 27 Jan 2009 16:26

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.

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

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kzz1p
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Re: Appx. Compression pressure chart

01 Apr 2009 12:17 - 01 Apr 2009 12:20

#277432

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

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

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Re: Appx. Compression pressure chart

01 Apr 2009 12:50

#277443

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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