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Topic: Compression

in Forum: C3 Engines


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Compression

Posted: 7/21/04 5:47am Message 1 of 4
DeanW
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Bristol, PA - USA
Joined: 9/4/2003
Posts: 14
Vette(s): 1969 L-46 convertable blue with bright blue interior
I have a 69 350/350 with 11:1 compression ratio. What should the PSI on a compression test read?


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Compression

Posted: 7/21/04 8:51am Message 2 of 4
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
150 PSI with no more than 20PSI variance


Compression

Posted: 7/23/04 6:45pm Message 3 of 4
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kstyer
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
Ideally, not more than 10% variation between cylinders. If you are up to 20%, the car will run okay, but not quite right. You may not notice.


Compression

Posted: 7/24/04 3:02pm Message 4 of 4
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cthulhu
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Hot Springs, AR - USA
Joined: 4/24/2004
Posts: 3236
Vette(s): 69 Conv #'s match 427, TKO-600/.64, 3.36HD-Posi, HT, T/T, PS, PB, PW, SP, Leather, Comp XE264HR & Roller Rockers & Lifters, Air-Gap RPM intake, Holley St Av 770 VS, MSD 6AL+Dist+Blaster SS, K&N, Jet-Hot Hooker Side-Pipes, Steeroids, Al Rad, Spal Fans
 kstyer said: Ideally, not more than 10% variation between cylinders. If you are up to 20%, the car will run okay, but not quite right. You may not notice. 


which is pretty consistent with the maximum 20 PSI allowable variance which equals 13%


in Forum: C3 Engines


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