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Compression test on Ls1 in C5

This is a discussion on Compression test on Ls1 in C5 within the General Help forums, part of the LSx Technical Help Section category; My buddy has a C5 with an Ls1. He had a little problem and we want to do a compression ...

  1. #1
    Red03SVTVert
    Guest

    Compression test on Ls1 in C5

    My buddy has a C5 with an Ls1. He had a little problem and we want to do a compression test to make sure everything internal is up to par. How many PSI should I see on a healthy motor. I have searched everywhere and found nothing. Also, what is safe to be disconnected so the engine will turn over and not fire. TIA any tips would be appreciated.

  2. #2
    Iroc89
    Guest
    Try going to Ebay and looking up Ls1 motors for sale. Usually they will have a new one or a used one and they usually tell you the Compression ratio that the engine is running.

  3. #3
    BlackHawk T/A
    Guest
    He doesn't want to know the CR he wants to know the PSI each cylinder should hold during a compression test...

  4. #4
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
    00 Z28 sold :-(

    should be in your repair manual if you have one...i think it's 175 psi. I'm having a prob finding a haynes or a chilton for our cars

  5. #5
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    Black
    2001 Camaro SS

    i think if they are within 10% of each other is more important then the psi they are at. Of course there is a range defined, check the shop manual, but if you have one cylinder more then 8-10% out, there might be a problem

  6. #6
    Junior Member
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    Quote Originally Posted by SeVeReDiStOrTiOn
    I'm having a prob finding a haynes or a chilton for our cars
    Having and using a Haynes or Chilton is like buying a band aid for a shotgun wound.

    Pretty damn worthless.

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