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Compression Check while engine is out?

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Old Sep 2, 2013 | 11:55 AM
  #1  
fasteddy's Avatar
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Default Compression Check while engine is out?

I'm trying to determine if a long block is good......

While the long block is on a stand can I just....
0. Make sure it has oil.
1. remove all the plugs
2. Install a plug one at a time and check compression by
Turning the crank with an impact gun and measuring with a gauge?

Has anyone ever done this?
Is there a better way to do it?

The engine(LQ9) looks really clean.....and I don't want to tear it apart if I don't have to.....I'd rather just slap some ported heads on it and go.
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Old Sep 2, 2013 | 12:24 PM
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I wouldnt use an impact to turn it, I dont think that you would get a fast enough rotation to get a good reading. I am not sure that there would be much rotation at all, the best bet is to use the starter hooked up to a battery.
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Old Sep 2, 2013 | 12:39 PM
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Its on a stand.....so no flywheel/flexplate for starter to grab onto.....

Good thought though!
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Old Sep 2, 2013 | 12:59 PM
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How about getting a leak down tester and cking leak down.Should be performed in the car when warm but you could still get an idea on ring and valve seal.
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