2 Head Gaskets??? - Page 2

art leong · 12-26-2007, 05:51 PM

Dave the calculator I used ( http://www.slowgt.com/Calc.htm ) gave me a slightly different reading (about a full point lower). Now I'm not sure which one is right?
I was under the thought that my compression was 13.58 to 1 with the 0.40 head gasket,
and about 12.16 to 1 with the 0.80 gasket.
Can anyone take a look at which calculator is correct?

There are only a few cams for the motor I'm using I don't want to go way up on the compression to start off plus the larger cams might have piston to valve issues. The overhead cam is probably more forgiving than a pushrod motor Due to very little weight. But I want to shoot for at least 0.060 The larger cam is .492 at the valve. The smaller one I'm using is .453

Tom Goldman · 12-26-2007, 07:00 PM

Art, I use the calculator Dave uses. ...I also use Challenger engine software. ... Both programs came out with similar numbers,altho higher than yours, using the specs you posted. . .....You didn't spec the gasket bore, but assuming it is 3.520"i.d., both programs indicate 14.25 to 1 compression with the .040" gasket,and 12.75to1 with an .080" gasket, if the 7.5cc dome volume is the net volume,including the valve reliefs ......Tom

12-26-2007, 05:51 PM	#1
art leong VIP Member Join Date: Dec 2001 Location: Richmond Hill, Georgia Posts: 2,003 Likes: 0 Liked 1 Time in 1 Post	Re: 2 Head Gaskets??? Dave the calculator I used ( http://www.slowgt.com/Calc.htm ) gave me a slightly different reading (about a full point lower). Now I'm not sure which one is right? I was under the thought that my compression was 13.58 to 1 with the 0.40 head gasket, and about 12.16 to 1 with the 0.80 gasket. Can anyone take a look at which calculator is correct? There are only a few cams for the motor I'm using I don't want to go way up on the compression to start off plus the larger cams might have piston to valve issues. The overhead cam is probably more forgiving than a pushrod motor Due to very little weight. But I want to shoot for at least 0.060 The larger cam is .492 at the valve. The smaller one I'm using is .453 __________________ Art Leong 2095 SS

12-26-2007, 07:00 PM	#2
Tom Goldman VIP Member Join Date: Jan 2003 Location: Allentown,PA Posts: 2,478 Likes: 894 Liked 886 Times in 238 Posts	Re: 2 Head Gaskets??? Art, I use the calculator Dave uses. ...I also use Challenger engine software. ... Both programs came out with similar numbers,altho higher than yours, using the specs you posted. . .....You didn't spec the gasket bore, but assuming it is 3.520"i.d., both programs indicate 14.25 to 1 compression with the .040" gasket,and 12.75to1 with an .080" gasket, if the 7.5cc dome volume is the net volume,including the valve reliefs ......Tom __________________ Tom Goldman 1500 SG , 1506 STK