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272 new build low compression

Discussion in 'The Repair Shop' started by rfarr94, Jul 18, 2021.

  1. cus_deluxe

    cus_deluxe ONE OF THE WORST!!

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    intake at 67? btdc?
     
  2. Stump Shot

    Stump Shot Disciple of Monkey's GoldMember

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    If your compression tester has an adapter on it, this can alter the reading in a small 2-stroke engine like a chainsaw.
     
  3. rfarr94

    rfarr94 OPE Member

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    It has a schrader valve on the end of the threads a tube right up to the gauge that has pressure release on it.
     
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  4. rfarr94

    rfarr94 OPE Member

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    67 btdc. I’ll re time it tonight. Trying to do everything a couple of times to make sure I’m not overlooking something stupid or obvious,
     
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  5. cus_deluxe

    cus_deluxe ONE OF THE WORST!!

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    im guessin u have a combination of things. a little extra ring gap and a huge chamber would go a long way toward low compression.
     
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  6. Mastermind

    Mastermind Leader Of The Clique Staff Member GoldMember

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    Timing numbers sound right. That 67 is from TDC.....right?
     
  7. davidwyby

    davidwyby Foster home for at risk saws n deuces GoldMember

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    I hate to be repetitive, but try oil in the chamber for the test.


    You can measure the volume of the chamber or compare to a good one (you have the old cyl?) with water.
     
  8. Stump Shot

    Stump Shot Disciple of Monkey's GoldMember

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    The casting voids(ports) have to be pinned on after the cylinder mold is made.
    At this point there are two choices, treat it like a finely tuned mechanical thing that it is, or treat it like Mr. Potato Head.
     
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  9. p61 western

    p61 western Ol Mudflap

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    Is this a bad time/place to sell a Hiway 272 top end? :couch:
     
  10. Kiwioilboiler

    Kiwioilboiler 346 Pic Examiner

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    Is it compression tested?
     
  11. Lightning Performance

    Lightning Performance Here For The Long Haul!

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    Good summation.

    Buying cylinders in bulk fixes most of the issues a builder will come across. Some just don't make the cut. You can buy pistons in four packs and more packs. When doing a V8 order ten and hope you have enough to match up for a build. Seen guys order twenty and then give up on a company cause they couldn't fill a four banger for street use, oh my. Some batches of parts are good and others not so much. Like monkey man said. A, B or C all = $
     
  12. p61 western

    p61 western Ol Mudflap

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    Negative buyer beware
     
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  13. Mastermind

    Mastermind Leader Of The Clique Staff Member GoldMember

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    We don't need no stinkin compression. If you don't believe me, ask PotMetalPony.
     
  14. Stump Shot

    Stump Shot Disciple of Monkey's GoldMember

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    Just don't over port the exhaust where it's made and you'll be fine. ;)
     
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  15. rfarr94

    rfarr94 OPE Member

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    Probably a stupid question, but when you say from TDC is that the same as before top dead center? Don’t you time intake before top dead center or am I doing something wrong when timing?
     
  16. huskihl

    huskihl Sausage Lives Matter

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    Before and after tdc will give the same reading. Easy way to tell your wheel is centered
     
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  17. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals) GoldMember

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    Odd. Most are wider in skirt. More thermal expansion in crown.
     
  18. Nutball

    Nutball Pinnacle OPE Member GoldMember

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    45mm bore (44.96mm), Piston: 44.90mm top to bottom
     
    Last edited: Jul 21, 2021
  19. Lightning Performance

    Lightning Performance Here For The Long Haul!

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    What are you measuring with?
     
  20. Nutball

    Nutball Pinnacle OPE Member GoldMember

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