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XfireZ51 · 09-07-2017

Below is a view of the top compression ring from #7. Also, motor is starting to go back together. Before Pete started, we discussed cc'ing the heads just to make sure we had all uniform chambers. Pete verified that they were uniform
40cc chambers. We did this on the suggestion of Marc H. Wanted to check if there was some other explanation for compression being overall somewhat lower on the driver's v passenger side banks. However, the FSM states compression should not vary greater than 15% from low to high cylinders. We're ok there (210 v 245). And FSM states that high end of adequate compression is 200psi. So we are over that by a significant number.

09-07-2017	#19
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,669	Re: So I had a bit of blowby... Below is a view of the top compression ring from #7. Also, motor is starting to go back together. Before Pete started, we discussed cc'ing the heads just to make sure we had all uniform chambers. Pete verified that they were uniform 40cc chambers. We did this on the suggestion of Marc H. Wanted to check if there was some other explanation for compression being overall somewhat lower on the driver's v passenger side banks. However, the FSM states compression should not vary greater than 15% from low to high cylinders. We're ok there (210 v 245). And FSM states that high end of adequate compression is 200psi. So we are over that by a significant number. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX Last edited by XfireZ51; 03-08-2024 at 02:10 PM.