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Old 08-04-2005, 07:57 PM   #1
lentinman
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Default 95 Saturn SL1 Cylinder Compression

Can anyone tell me what the compression setting should be? I guess I'm wondering what they would have been new and what they would expect to be after 10 years and what is horrible. Thanks.

Len

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Old 08-04-2005, 08:52 PM   #2
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Default Re: 95 Saturn SL1 Cylinder Compression

185 - 205 PSI is normal spec for a warm engine . It should build up quickly and evenly. Below 180 PSI is getting a bit tired .

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Old 08-05-2005, 04:55 PM   #3
lentinman
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Default Re: 95 Saturn SL1 Cylinder Compression

Stanley:

Thanks for the reply. You are saying 185-205. I called the local Saturn service department. The guy I talked to put me on hold to find out. I don't know whether he looked up the specs or asked someone else. But, he stated 160-170. I asked him what they would have been new and he said 170 or so.

That is a huge difference. I wonder if it could be the SL1 issue. He asked me what model I had and I said SL1 and he said "Ok, so it is a single" - clearly implying that it mattered. Did you consider that?

Len

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Old 08-06-2005, 02:36 AM   #4
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Default Re: 95 Saturn SL1 Cylinder Compression

Two things that could be different:
  1. The 95 may have had some changes made that differ from the 92 SOHC spec
  2. The service manual I own for the 91-92 may be wrong

I've included some of the literature from the service manual.

Doing further research and if we can trust the rest of the information from the manual, the compression ratio for the a SOHC is 9.3:1 and a DOHC 9.5:1. The bore and stroke for both engines is the same, 3.2" x 3.5". The SOHC cam lobe lift rise is 0.2531"-0.2556". The DOHC cam lobe lift rise is much higher at 0.35" (and some change) for intake and 0.34" (and some change) for exhaust.

So...Yes, I would have to conclude the compression would be lower on a SOHC considering the lower compression ratio with the same bore and stroke, fewer valves and the less aggressive cam. Perhaps some others may have a '95 SOHC spec sheet that will clear it up?

Go with what Saturn's mechanic says.
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Old 08-06-2005, 04:23 AM   #5
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Default Re: 95 Saturn SL1 Cylinder Compression

Even a cold test should reveal above 180psi.

Cold compression on my engine WAS 210 all across.

But its 210 210 170 0 now Lol.

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Old 08-06-2005, 03:50 PM   #6
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Default Re: 95 Saturn SL1 Cylinder Compression

Jeremy & Stanley: Thanks.

He also said that the differential between the cylinders should vary no more than 10. Your 210, 210, 170, 0 looks to have a higher differential than that. I suspect you have a problem.... just kidding.

Len

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