Leak down test how too..
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Leak down test how too..

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    Senior Member Delemorte's Avatar
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    Default Leak down test how too..

    So is the point of a leak down test to find our where air is escaping or if your leaking air at all? Will the cylinder ever hold air perminently or does it allways leak?


    Got any good step by step instructions that i can follow for my SBC? or tips or suggestions i should follow?


    thanks!!
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    Resident Ford Nut Sleeper CP's Avatar
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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by Sleeper CP View Post

    thank you. So if i read that right i am using the engine to build pressure then holding that cylinder at TDC to monitor for pressure loss. If thats the case i had this idea totaly ass backwards.. Since i dont know if my engine is limping or not i cant get it to operating temps. Is that gonna be bad?
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    Senior Member gregb's Avatar
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    Realistically, if it's that bad then just pressurizing the cylinder with air while it's at TDC with the valves closed will tell you what's leaking, if the escaping air is coming out the valve cover then it's most likely the piston or rings, if it comes out the intake it's an intake valve, if it's coming out the headers the exhaust valve, if it comes out an adjacent cylinder or the water hose usually a head gasket. Most of the time anyway. From your other post a 90 psi loss is going to show up somewhere, wont matter if the engine is warm or cold.

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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by gregb View Post
    Realistically, if it's that bad then just pressurizing the cylinder with air while it's at TDC with the valves closed will tell you what's leaking, if the escaping air is coming out the valve cover then it's most likely the piston or rings, if it comes out the intake it's an intake valve, if it's coming out the headers the exhaust valve, if it comes out an adjacent cylinder or the water hose usually a head gasket. Most of the time anyway. From your other post a 90 psi loss is going to show up somewhere, wont matter if the engine is warm or cold.

    its a 60 PSi loss but thank you for all your help. For reall!!!
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    del, there's a hole in those pistons man. the speckles told the tell , build ya a 383 now

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    del, there's a hole in those pistons man. the speckles told the tell , build ya a 383 now

    Hush fool hush... Im hoping for the best...
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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    mo balls than $cents$ IMPATIENT 1's Avatar
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    Quote Originally Posted by Delemorte View Post
    Hush fool hush... Im hoping for the best...
    lol, i saw a nice used rotating assembly for sale on yellowbullet.com for under 600, pistons/rods/crank and it was all forged stuff, almost bought it myself

    Dare to be different, if it turns out great you can claim you planned it that way.

    Jetboatperformance.com

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    Senior Member Delemorte's Avatar
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    Quote Originally Posted by IMPATIENT 1 View Post
    lol, i saw a nice used rotating assembly for sale on yellowbullet.com for under 600, pistons/rods/crank and it was all forged stuff, almost bought it myself

    Il have to wait till i confirm shit went kaboom before the wife unit Ok's any additional boat purchases.. I do have a baby on the way ya know.. :-)
    Quote Originally Posted by jetboatperformance View Post
    the ensueing fire would likely be extinguished by the sinking however

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