Leakdown ?

Discussion in 'PSI Superchargers Tech Questions' started by PROMOD63, Apr 11, 2009.

  1. PROMOD63

    PROMOD63 Member

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    Leaking the engine cold what is alowable leak down i have aboub 5 lbs more than i did last time it was 35-30% now it is 35-40% after 6 eigth mile passes all other aspect are fine
     
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  2. Bob69

    Bob69 Member

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    Can you hear wear the leak is coming from? Open the injector does the hissing come from there. At the end of each exhaust pipe?
    Its important to know if its leaking past the valves or going via the sump.
    Cheers
     
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  3. secondwindracing

    secondwindracing top alcohol

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    is your time falling off?? If not don't worry about it..I used to be very anal about checking this and Ora once told me to not check it till I was seeing my times or mph falling off...also if it's leaking alittle at the ex. side I would be to concerened..Dave
    www.myspace.com/daveloweswr
     
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  4. Alkydrag

    Alkydrag Sr. Dragster

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    In my opinion, leakdown numbers are not all there cracked up to be. When you do a leak check, your checking it when the engine is not running. You cant duplicate the cylinder pressure with a leakdown tester that the engine actually sees when it's running. The rings will seal better when it's running. The rings spin on the pistons while it's running. If your numbers are high, then you could have the gaps lined up. Like Ora said, don't pay no mind to it until your numbers fall off.
     
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