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Thread: Compression #'s on 73E engine

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  1. #1

    Compression #'s on 73E engine

    What would the experts think normal compression numbers would be on an excellent running, well maintained 73E 2.4 MFI with 150K miles?
    Appreciate your thoughts and time.
    Bobby
    Bobby Smith
    member #299
    1973 914/4 2.8 ltr. (FTD winner 2008 Charlotte Parade) (sold)
    1973 911 "Orangello"
    1973 914/6 GT 3.2 "Crystal Blue Persuasion" (sold)
    2011 Boxster Spyder
    1973 911 E "E GO" Metallic Green

  2. #2
    Hi Bobby, I only do leak down tests which I would expect to be 15% or less and the more even across cylinders the better. But cranking compression should be in the 120 psi range (give or take maybe 15 psi either way) and again, the more even the better.
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  3. #3
    Thanks Ed. Hope you're doing well. Really enjoyed meeting you at the 2008 Parade in Charlotte. I recently acquired a 73 E that had been in storage for 6 years. I'm resurrecting it. Running incredibly well after a ton of work. Will check compression soon to get a base line. Thanks for your expert advise.
    Bobby Smith
    member #299
    1973 914/4 2.8 ltr. (FTD winner 2008 Charlotte Parade) (sold)
    1973 911 "Orangello"
    1973 914/6 GT 3.2 "Crystal Blue Persuasion" (sold)
    2011 Boxster Spyder
    1973 911 E "E GO" Metallic Green

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