94 series one Compression - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat

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Old 04-14-2004, 12:55 AM   #1
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Default 94 series one Compression

I was just wondering what the Compression should be like on a series 1 94 se.

I was reading 120psi does this sound right? GOOD or BAD

Please leave some feedback if you know anything about this

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Old 04-14-2004, 01:52 AM   #2
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Sounds pretty good. I think 150 was stock? Very respectable. Did you do a wet AND dry test?
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Old 04-14-2004, 02:00 AM   #3
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It is also pretty important how much variation you get among all the cylinders. The less the better. It will also make a big difference whether you test the compression when the engine is cold or at operating temperature. When up to temperature, the readings are usually much higher (and more meaningful). You will be OK with the cast iron heads on the 3800, pulling the plugs hot, but it is not good practice with aluminum heads - the threads in the Al strip more easily hot. With aluminum heads, I usually use anti-seize on the plugs whenever I install them. Anti-seize won't hurt in cast iron heads, either.
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