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Old 06-11-2007, 11:10 AM   #1
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Question Compression numbers question?

Anyone have an idea as to how much lower compression test numbers are on a cold engine vs. operating temp? I ask b/c the salvage yard tested the engine that I'm going to pickup, but they were cold numbers as the engine is already out of the vehicle. Luckily the numbers are all relatively consistent, but sounded just a tad low to me in the mid 150s.
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Old 06-11-2007, 11:38 AM   #2
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In response to your question I would say that a hot engine would have a higher compression ratio due to the fact that hot metal expands but thats just my opinion.
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Old 06-11-2007, 12:13 PM   #3
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did they do a wet test?
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Old 06-11-2007, 12:48 PM   #4
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Quote:
Originally Posted by y8s View Post
did they do a wet test?
Nope, and for a $300 junkyard motor, I don't think they are going to go the hassle of doing it.
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Old 06-11-2007, 12:56 PM   #5
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They also may not of had it up to specified RPM. Which is on a warm engine, fully charged battery, and good starter motor.
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