 Cold Compression Stand |
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| r_towle |
 Oct 11 2003, 07:54 PM
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#1
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Custom Member  Group: Members Posts: 24,591 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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Is a compression test performed on an engine stand valid?
I am thinking of using an impact wrench to get it spinning. Rich |
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Replies(1 - 2)
| ejm |
Oct 12 2003, 05:28 AM
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I can see the light at the end of the tunnel Group: Members Posts: 2,694 Joined: 3-February 03 From: Massachusetts Member No.: 224 Region Association: None |
Not really, the engine should be warm and I don't think the impact will spin it fast enough. A leak down test would give better results with the engine out of the car.
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| tracks914 |
Oct 12 2003, 12:43 PM
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#3
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Canadian Member Group: Benefactors Posts: 2,083 Joined: 15-January 03 From: Timmins, Ontario, Canada Member No.: 153 Region Association: None  |
?????Spin your engine with an impact?????
Engines are tough but that would not be a good idea. The pounding can only hurt. Find a good heavy duty 3/4" drill. Make an adapter for it and turn the engine over with that. You can still take compression readings with a cold engine but they will all be about 10-20% lower than a warm engine. What it will tell you is if you have different readings on different cylinders. A bad one will stand out and you know you will have to work on it. |
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