Cold Compression Test Question
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This is a discussion on Cold Compression Test Question within the Everyday Impreza Talk forums, part of the Community - Meet other Enthusiasts category; 2003 WRX 2.0 Turbo. My general sense is that a warm compression test is ideal. However, I have a unique ...

  1. #1
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    Cold Compression Test Question

    2003 WRX 2.0 Turbo. My general sense is that a warm compression test is ideal. However, I have a unique situation. The turbo is OUT, and I'd like to get an indication of the condition of the engine. The best I can do at this time is a cold compression test. I plan to do a warm test again later.

    Here's the question. Can a (cold) compression test be done with the turbo off? Does that matter? What will happen when (or what is the risk of) cranking with turbo out?

    I appreciate any insight from those who know.

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  3. #2
    Moderator Donkey's Avatar
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    It can be done but you need to put a little oil in the cylinder first. Warm is ideal due to oiling and piston ring expansion.
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