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Compression test a motor that’s been sitting for a while

Posted by TK's9d2TSi, Apr 3, 2020

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  1. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Looking at a complete motor tomorrow. Guy says it’s been sitting for a while. Is it safe to check compression without oil in it?
     

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  2. ThunderChild

    ThunderChild Supporting VIP

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    How long has it been sitting? Has it ever had oil in it?

    Can always put a few drops of marvel mystery oil or your preferred brand in the plug holes to lube it. If the bottom end has assembly lube then it should be ok for compression tests, even better if the oil pump is packed so it'll circulate some oil around.

    If it's a fresh motor, I'd check those things before testing. If it's sat for an extremely long period, oil in the cylinders should be enough, as the bottom end will still.have oil film and potentially still pull oil up after cranking.
     

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  3. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    It’s not a fresh motor. He said a year or two.
     

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  4. ThunderChild

    ThunderChild Supporting VIP

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    I'd say it's fine to compression test. Ive tested motors that have sat longer than that and never had an issue.
     

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  5. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    I've seen those companies that sell jdm engine compression test those, so I was guessing it was fine. I will add some oil in the cylinders though. Thanks, Henry!!
     

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  6. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    $250 so we’ll see her status tomorrow

    upload_2020-4-3_12-56-17.jpeg

    upload_2020-4-3_12-56-35.jpeg
     

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  7. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I hope that works out for you! Dam good deal on it if so! :thumb:
     

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  8. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Hope so too Marty! This way I can take my time and build it so she won't be down for too long. Hell the CAS alone is a good portion of that.
     

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  9. Black95TSIawd

    Black95TSIawd Proven Member

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    Adding oil will inflate the numbers. Keep that in mind.
     

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  10. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    I will. Thanks for the reminder
     

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  11. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    4:40am. Woke up and realized there’s no starter of flywheel. :toobad: Maybe I’ll pull the head off
     

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  12. ThunderChild

    ThunderChild Supporting VIP

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    No spare tranny/starter/plate setup for compression tests?? And you call yourself a dsm'r.... Haha LOL
     

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  13. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    LOL. I threw my old pp out but do have an extra tranny and starter is only two bolts. I should be able to turn the crank with an impact and still read compression?

    Fudgeeeee! Can’t go back to sleep :banghead:
     

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  14. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    A true DSMer has TWO of everything ROFL
     

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  15. ThunderChild

    ThunderChild Supporting VIP

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    Once it makes compression on the gauge it'll just be hammering on the crank bolt. Could always make a run for some bolts, or pull the head. I'm sure you'll work it out Tony!
     

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  16. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Wife want to run around today. Won’t make it out there today and guy says he has a potential buyer
     

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  17. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    Start a thread in hangout called you’re not a true dsmer unless...
     

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  18. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I should. I have 2 of MOST things but I am missing a spare auto trans. Plenty of 5 speeds tho.
     

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  19. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    ...unless you’re hoarding parts
     

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  20. ṳṆḊḕṙḉṏṼḕṙ ṖṙṏḊḭḠẏ

    ṳṆḊḕṙḉṏṼḕṙ ṖṙṏḊḭḠẏ Proven Member

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    Ive only been at it since October, and already have 2 (or more) of a bunch of things, even cars:D
     

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  21. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

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    I'm making LOTS of money off my "inventory" because everyone is home, working on their DSM's ROFL
     

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  22. Jerzm3

    Jerzm3 Supporting VIP

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    I would do a leakdown over compression test. No need for starter/flywheel. Just set that cylinder to tdc and test.
     
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  23. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    true dsmer :thumb:

    We need to give you vendor/moderator title :sneaky:

    Guy seems annoyed I couldn’t come. If I bought it, it would be with a contingency that if it’s bad, I’m brining it back or partial refund dependent on the condition.
     

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  24. ThunderChild

    ThunderChild Supporting VIP

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    Honestly I'd buy it as a core for $250, personally.
     

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  25. TK's9d2TSi

    TK's9d2TSi Supporting Member

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    I would’ve as long as the cylinder walls were good but he want happy I couldn’t make it today
     

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