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Old 11-11-2007, 09:30 PM   #1
casterman
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Default 97 SL2 -- what should the compression be?

what should the compression be on an engine with 120K miles?

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Old 11-11-2007, 09:49 PM   #2
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Default Re: 97 SL2 -- what should the compression be?

Up near 150 psi or higher

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Old 11-12-2007, 04:12 PM   #3
AndyB
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Default Re: 97 SL2 -- what should the compression be?

I have a 95 sw2 with ~145k. I tested mine a month ago and each cylinder showed about 225 psi. BTW, the reason I tested mine is because it has recently gone from using a quart of oil every 1500 miles to a quart every 500 miles

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Old 11-13-2007, 05:30 AM   #4
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Default Re: 97 SL2 -- what should the compression be?

In general, you aren't looking so much for a specific number but, whether all cylinders are in the same general area. If you have on cylinder that reads a lot different than the others, you have a problem.

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Old 11-13-2007, 12:22 PM   #5
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Default Re: 97 SL2 -- what should the compression be?

And if you do a leakdown test you'll often draw the wrong conclusion on a saturn, as to whether it needs rings or not.

Do what barnowl says.

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Old 11-13-2007, 01:09 PM   #6
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Default Re: 97 SL2 -- what should the compression be?

I think between 180 and 210 is what healthy saturn engines test at

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Old 11-13-2007, 02:41 PM   #7
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Default Re: 97 SL2 -- what should the compression be?

Both the Haynes and Chilton say 180-210, but when brought to operating temperature (pull the plugs on a hot engine??). One Saturn tech told me 180-210 was correct, although 160 and even (within about 5 psi?) was good on a higher mileage engine. Wouldn't doing a compression test cold give you lower numbers than hot? I'm a bit confused there. I've got 205-210 on mine cold, and almost 200K on it.

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Old 11-13-2007, 02:57 PM   #8
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Default Re: 97 SL2 -- what should the compression be?

Quote:
Originally Posted by teenytaurus View Post
Both the Haynes and Chilton say 180-210, but when brought to operating temperature (pull the plugs on a hot engine??). One Saturn tech told me 180-210 was correct, although 160 and even (within about 5 psi?) was good on a higher mileage engine. Wouldn't doing a compression test cold give you lower numbers than hot? I'm a bit confused there. I've got 205-210 on mine cold, and almost 200K on it.
I think heat = expansion, so less compression when cold sounds right to me.

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Old 11-13-2007, 03:16 PM   #9
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Default Re: 97 SL2 -- what should the compression be?

Quote:
Originally Posted by 1999greenSL2 View Post
I think heat = expansion, so less compression when cold sounds right to me.
I thought so, too, so was a little shocked I got such high compression on such a high mileage engine (that was abused by the previous owner). A lot of carbon causing higher readings, or am I just one lucky lady? lol

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