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  1. #1
    Trent_sl750's Avatar
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    Leak down test sl 750

    In 10 mins i drop from 9in of vac to exactly 5..... Is that more than i should be loosing or is that a safe gap? Iv seen its ok to drop from 2-3 and also 3-4, any clarification would be greatly appreciated.


  2. #2
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    Pump it up with 10 psi pressure and use soapy water to find the leaks. All of my engines will hold 10 psi indefinitely after assembly. It would be nice to see where the leaks are.

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  4. #3
    Trent_sl750's Avatar
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    After i tested a couple of times i decided to check bolts and sparkplugs and i got around an 1/8 of a turn tighter on the spark plugs and tested again, its been on 10in for the past 30 mins with no loss in vac... Simple as plugs needing a hair more tightening

  5. #4
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    Why are you using vacuum? Try it with 8-10 PSI pressure and see what you get. 10 inches of vacuum isn't much.

  6. #5
    Trent_sl750's Avatar
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    I was doing a leakdown on my motor and putting 10in of vac... That what i read to do on the leak down test directions on http://www.greenhulk.net/forums/show...=1#post1028221

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