Compression

Discussion in 'Triumph General Discussion' started by rob wheeler Wheeler, Oct 26, 2023.

  1. rob wheeler Wheeler

    rob wheeler Wheeler New Member

    Oct 25, 2023
    0
    1
    new milton
    #1 rob wheeler Wheeler, Oct 26, 2023
    hey what should the compression test read on a triumph speed triple T509 1998(EFI)?
     
  2. sprintdave

    sprintdave Nurse, think it's time for his medications.
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    May 25, 2014
    1,628
    750
    Birmingham
    #2 sprintdave, Oct 26, 2023
    I believe it should be between 140 and 200 psi and no more than 25 psi difference between cylinders.
    Can't seem to find where I got that from though.
     
  3. rob wheeler Wheeler

    rob wheeler Wheeler New Member

    Oct 25, 2023
    0
    1
    new milton
    #3 rob wheeler Wheeler, Oct 26, 2023
    i am reading 110 on the first and just 100 2n and 3rd on cold
     
  4. Pegscraper

    Pegscraper Elite Member

    Jun 12, 2020
    3,433
    800
    Yorkshire
    #4 Pegscraper, Oct 26, 2023
    Last edited: Oct 26, 2023
    Numerous factors will affect compression readings but typically a compression ratio of 10:1 (your bike) should give 150-200 psi.
    Readings at the lower end are not necessarily anything to worry about if there is less than 10% variation between cylinders.
     
  5. rob wheeler Wheeler

    rob wheeler Wheeler New Member

    Oct 25, 2023
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    1
    new milton
    #5 rob wheeler Wheeler, Oct 26, 2023
    its only done 10,000 miles but yep thank you for the reply mate
     
  6. sprintdave

    sprintdave Nurse, think it's time for his medications.
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    May 25, 2014
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    #6 sprintdave, Oct 28, 2023
    If the engine was hot that is quite low.
     
  7. rob wheeler Wheeler

    rob wheeler Wheeler New Member

    Oct 25, 2023
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    new milton
    #7 rob wheeler Wheeler, Oct 30, 2023
    the engine was stone cold bud
     
  8. sprintdave

    sprintdave Nurse, think it's time for his medications.
    Subscriber

    May 25, 2014
    1,628
    750
    Birmingham
    #8 sprintdave, Oct 30, 2023
    Can you try it warm, it may be fine then.
     
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