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Thread: Compression....

  1. #1
    sleeplessnMS's Avatar
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    Compression....

    Whats the difference testing hot vs cold? 15-20lbs? Average say.....I cant remember


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    Hydrotherapy's Avatar
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    Quote Originally Posted by sleeplessnMS View Post
    Whats the difference testing hot vs cold? 15-20lbs? Average say.....I cant remember
    mine is between 5-8 lbs...

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    Rendog's Avatar
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    Whats kind of readings are you guys getting? I got results of 145/125/145 cold.

    Added a little oil to the middle cylinder and it brought it up to 150

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    Like a chimp with a ball-peen hammer smackwave's Avatar
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    Quote Originally Posted by Rendog View Post
    Whats kind of readings are you guys getting? I got results of 145/125/145 cold.

    Added a little oil to the middle cylinder and it brought it up to 150
    That's pretty good for a cold engine, but that oil in the spark plug hole brought the compression up 25 PSI is a sign that it's time for new rings and a hone.

  5. #5
    WE DONT DIAL 911 RDH's Avatar
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    im getting 130 lbs with my 41cc (150 lbs) heads on...ive only tested when its cold so maybe thats why, but i wouldnt think doing it hot would bring it up 20lbs?....i am also using three head gaskets too..

    what increase have you guys gotten from taking off one gasket if any?

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    Flying Scotsman's Avatar
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    Quote Originally Posted by RDH View Post
    im getting 130 lbs with my 41cc (150 lbs) heads on...ive only tested when its cold so maybe thats why, but i wouldnt think doing it hot would bring it up 20lbs?....i am also using three head gaskets too..

    what increase have you guys gotten from taking off one gasket if any?

    Try another gauge it may read higher.

  7. #7
    WE DONT DIAL 911 RDH's Avatar
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    Quote Originally Posted by Flying Scotsman View Post
    Try another gauge it may read higher.

    damn i hope mine is right. it was brand new and i didnt get the cheap kind...

  8. #8
    Flying Scotsman's Avatar
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    You never know worth a second opinion.

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    philip_gpr's Avatar
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    what increase have you guys gotten from taking off one gasket if any?

    approx 10 lbs

    also will reduce squish by the thickness of the gasket (approx .010 in)

  10. #10
    Happily Self-Employed WFO's Avatar
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    Actually .010" will give about 5lbs more compression.

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