348 Compression Test. Relatively easy? | FerrariChat
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348 Compression Test. Relatively easy?

Discussion in '348/355' started by carwhisperer, Nov 18, 2014.

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  1. carwhisperer

    carwhisperer Formula Junior

    Sep 29, 2014
    426
    Sacramento, CA
    Full Name:
    Brian
    #1 carwhisperer, Nov 18, 2014
    I'm considering purchase of a 348 and I plan to do my own PPI. I am wondering if there is anything special about compression testing it. I understand I should remove all plugs, disable the fuel pump and have the throttle wide open during the test. Is there anything else I need to know? How hard is it to get to the spark plugs?
     
  2. dapper

    dapper Formula Junior

    Nov 10, 2003
    711
    Bristol, UK
    Full Name:
    Dave
    #2 dapper, Nov 18, 2014
    Plug access is pretty easy, they're right there (unlike my 993...dohhh)
     
  3. joshtownsend

    joshtownsend Formula Junior

    Jul 12, 2007
    422
    H-town...TEXAS
    #3 joshtownsend, Nov 18, 2014
    tb being opened or closed, it made no difference to me.. your not looking for the most air, you looking to see if they are all close together, so whatever you do, do it for all of them.
     
  4. pnicholasen

    pnicholasen Formula 3

    Jan 14, 2011
    1,364
    South of Philly
    Full Name:
    Paul Nicholasen
    #4 pnicholasen, Nov 19, 2014
    Make sure your compression tester comes with a bunch of adapters for various spark plug sizes, because the 348 plugs are very skinny. My tester only had adapters for the standard 2 plug sizes, so I had to buy another adapter piece to fit the 348 plug holes.
     
  5. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,276
    CT
    Full Name:
    John Kreskovsky
    #5 johnk..., Nov 19, 2014
    Test should be done with throttle wide open. It does matter. Yes, you want consistence but you also want to know that the pressures are in the correct range. See the table at the end of this document for estimates of what the pressure should be for the specified compression ratio. http://www.healey6.com/Technical/Nominal%20compression%20pressure.pdf
     

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