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Please post your compression results!

Discussion in 'Technical Q&A' started by sjvalin, Jul 14, 2005.

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  1. sjvalin

    sjvalin Formula Junior

    Aug 31, 2004
    724
    Nevada County, CA
    Full Name:
    Steve Valin
    #1 sjvalin, Jul 14, 2005
    There seems to be wide and varied opinion on what compression readings should be for various engines at different mileages. Seems like it would be valuable to see what others have seen on their engines. If possible include: type of engine, mileage, and results (either of each cylinder, or the range). Leakdown info would be cool to have, too.

    My Daytona:
    365GTB/4 4.4l Euro, 57Km
    155 to 165
     
  2. pernicev

    pernicev Karting

    Jun 22, 2005
    134
    #2 pernicev, Jul 14, 2005
    My 78 308 GTB
    205-210 with out having been run for over a year

    My 79 308 GTS
    190-200 on freshly rebuilt engine

    My 81 Mondial
    120 - 130 with BAD piston rings
     
  3. Verell

    Verell F1 Veteran
    Consultant Owner

    May 5, 2001
    7,022
    Groton, MA
    Full Name:
    Verell Boaen
    #3 Verell, Jul 14, 2005
    My '82 Euro 308 GTS QV @ 36,600 miles: 180-185 Engine cold, plugs out. Cranked over several times for each. cyl.
     
  4. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,348
    UK
    #4 Iain, Jul 14, 2005
    My UK spec 328 at 31K miles:

    1 @ 175, 2 @180, 4 @ 185 & 1 @ 190

    Warm with all the plugs out AFAIK

    I.
     
  5. JTR

    JTR Formula 3
    Owner

    Apr 26, 2005
    1,502
    in a house
    Full Name:
    John
    #5 JTR, Jul 15, 2005
    My BB 512 Boxer @ 21,000 miles, cold engine.
    Comp between 191, and 201psi.
    Leakdown from 1, to 3%.
     
  6. JSessions

    JSessions Guest

    May 23, 2005
    78
    SC
    Full Name:
    Jason Sessions
    #6 JSessions, Jul 15, 2005
    95 456 with 23,500 miles

    185-210. Average was 199.
     
  7. pad

    pad Formula 3

    Sep 30, 2004
    1,426
    Tequesta, FL
    Full Name:
    Paul Delatush
    #7 pad, Jul 15, 2005
    83 QV - 165 all cylinders - engine warm, all spark plugs out - 70,000+ miles showing on OD.
     
  8. PerryJ

    PerryJ Formula 3

    Jun 5, 2003
    1,909
    N. Alabama
    Full Name:
    John Perry
    #8 PerryJ, Jul 15, 2005
    Me and a friend who has a car the same year car as mine, just pulled a plug on each of our cars and we both tested 120. (both cars warm not hot, with no battery charger) with only one plug out, how much difference would it make if we had pulled all plugs so it would spin more freely ??
     
  9. Iain

    Iain F1 Rookie

    Jan 21, 2005
    3,348
    UK
    #9 Iain, Jul 15, 2005
    ...a fair bit I would think

    I.
     

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