Comp guru's please help me.....
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From: Kitchener, ON, Canada
Comp guru's please help me.....
I need to know the compression of my motor before I send it in the machine shop.......... I have a 97 GSR block and a ITR head shaved 0.30 thou. I want to put either PR3 pistons or P30's I think the P30's will be too much but could you please give me both compressions??? Thanks alot guys Rob
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From: Honolulu/Kauai, Hawaii, United States
Re: Comp guru's please help me..... (sircrxracer)
Here ya go...
http://www.c-speedracing.com/h...c.php
http://www.c-speedracing.com/h...c.php
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From: Kitchener, ON, Canada
Re: Comp guru's please help me..... (DarkSol97)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DarkSol97 »</TD></TR><TR><TD CLASS="quote">Here ya go...
http://www.c-speedracing.com/h...c.php</TD></TR></TABLE>
where do you put the shaved head ??? sorry I'm a noob hahahaha LOL Rob
http://www.c-speedracing.com/h...c.php</TD></TR></TABLE>
where do you put the shaved head ??? sorry I'm a noob hahahaha LOL Rob
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From: Rochester, NY
Re: Comp guru's please help me..... (sircrxracer)
Milling the head made your combustion chambers smaller. So you have to subtract an amount from that value in the calculator. The value is found like this
Take the stock combustion chamber volume of 42.7 cc. You milled 30 thou, or .076 cm. The volume you removed then is .076 * bore (cm) * bore (cm) * Pi/4 = 3.92 cc.
So your combustion chamber volume is 42.7 - 3.92 = 38.78.
And because I'm bored, with the PR3 piston that puts you at 12.1:1 and with the P30 that puts you at 12.4:1.
Edit: this is all assuming you meant 30 thou and not .30 like you typed.
Take the stock combustion chamber volume of 42.7 cc. You milled 30 thou, or .076 cm. The volume you removed then is .076 * bore (cm) * bore (cm) * Pi/4 = 3.92 cc.
So your combustion chamber volume is 42.7 - 3.92 = 38.78.
And because I'm bored, with the PR3 piston that puts you at 12.1:1 and with the P30 that puts you at 12.4:1.
Edit: this is all assuming you meant 30 thou and not .30 like you typed.
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Joined: Sep 2003
Posts: 1,382
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From: Kitchener, ON, Canada
Re: Comp guru's please help me..... (MolecularIntegra)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MolecularIntegra »</TD></TR><TR><TD CLASS="quote">Milling the head made your combustion chambers smaller. So you have to subtract an amount from that value in the calculator. The value is found like this
Take the stock combustion chamber volume of 42.7 cc. You milled 30 thou, or .076 cm. The volume you removed then is .076 * bore (cm) * bore (cm) * Pi/4 = 3.92 cc.
So your combustion chamber volume is 42.7 - 3.92 = 38.78.
And because I'm bored, with the PR3 piston that puts you at 12.1:1 and with the P30 that puts you at 12.4:1.
Edit: this is all assuming you meant 30 thou and not .30 like you typed.</TD></TR></TABLE>
Are you sure? man 12.1 that's damm high for the street I don't know if I can do..... well I use 94 octane I guess I would work. Rob
Take the stock combustion chamber volume of 42.7 cc. You milled 30 thou, or .076 cm. The volume you removed then is .076 * bore (cm) * bore (cm) * Pi/4 = 3.92 cc.
So your combustion chamber volume is 42.7 - 3.92 = 38.78.
And because I'm bored, with the PR3 piston that puts you at 12.1:1 and with the P30 that puts you at 12.4:1.
Edit: this is all assuming you meant 30 thou and not .30 like you typed.</TD></TR></TABLE>
Are you sure? man 12.1 that's damm high for the street I don't know if I can do..... well I use 94 octane I guess I would work. Rob
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