1989 328 compression test results? | FerrariChat
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1989 328 compression test results?

Discussion in 'Technical Q&A' started by TK 328, Jul 24, 2007.

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  1. TK 328

    TK 328 Karting

    Dec 24, 2006
    167
    Perth West Australia
    Full Name:
    Tony
    #1 TK 328, Jul 24, 2007
    I hope I am not asking a stupid question here as have searched all area's for info,but just wanted to know about compression test results for my car.I have had her for 18 months and all is great, I was told the report was good just never asked the specific question about how the compression results rated to other 328's etc. On my PPI report compression results were.
    #1-175
    #2-175
    #3-180
    #4-175
    #5-175
    #6-180
    #7-175
    #8-175
    It was a low klm car 17,000klm's at the time now 23,000klm's (in Australia so klm's) Just always wanted to ask but never got around to it.Thanks guys..and girls
     
  2. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,054
    USA
    #2 f355spider, Jul 24, 2007
    Looks great, drive on! ;)
     
  3. 335s

    335s Formula Junior

    Jan 17, 2007
    870
    SF Bay Area
    Full Name:
    T. Monma
    #3 335s, Jul 24, 2007
    Remeber that:
    you can have 175PSI compression, and, unknowingly have pitted exhaust valve seat(s)-only 1 will do the trick for this discussion(!)(stellite coatings on 328s, GTOs, 348 TR, etc!), and the result is... say...28% leakdown and appx 1200-1400ppm on a static(no loaded dyno rollers...) HC ppm scan....
    In California, it is a valve job to get a pass on your smog check!
    A compression test is useless on "multivalve" Ferraris...in general...when evaluating combustion chamber gas sealing integrity, think in terms of what the dipole(o2 sensor) is "seeing"
    Think stochiometric!
     
  4. TK 328

    TK 328 Karting

    Dec 24, 2006
    167
    Perth West Australia
    Full Name:
    Tony
    #4 TK 328, Jul 24, 2007
    Wow ok being from the Fitness industry for 20 odd years, I dont really understand this answer but thanks for the info I better read up somewhat I think......Tony
     
  5. spirot

    spirot F1 World Champ

    Dec 12, 2005
    15,161
    Atlanta
    Full Name:
    Tom Spiro
    #5 spirot, Jul 25, 2007
    I have an 86 328... with 30K miles... and my numbers are almost exactly like your... which is very good! no worries there. as for the Stoichiometric crap... dont worry...you're fine!
     
  6. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,054
    USA
    #6 f355spider, Jul 25, 2007

    Is it really possible to have 28% leakdown and have 175 psi compression?

    Even if it were, I would not sweat the results posted. 308QV's and 328's are just such solid cars, they really have no reputation for top end issues (or bottom end for that matter).
     
  7. TK 328

    TK 328 Karting

    Dec 24, 2006
    167
    Perth West Australia
    Full Name:
    Tony
    #7 TK 328, Jul 26, 2007
    Many thanks guys, I do feel better with your words of wisdom.She really does drive sweet in every way and I could not be more happy with performance,drive ability etc (ok the air cond sucks badly after lots of $$$ spent, I may resort to puting a Jap unit in her, I know, shock horror!!!)
    So if thats the only thing, all is good.Thanks again.Tone
     
  8. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,054
    USA
    #8 f355spider, Jul 26, 2007
    Yes, drive an enjoy. What 335s posted may entirely be possible in the "universe" of possibilities, and may have happened on occaision, but I imagine it is very rare. Up to you if you want to dig into it that far...(I wouldn't bother).
     

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