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Leak down numbers (Read 3929 times)
3racer
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Leak down numbers
01/16/10 at 8:40pm  
What should a race motor leak down %'s be?  

Thanks for any help.
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Nick
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Re: Leak down numbers
Reply #1 - 01/17/10 at 3:41pm  
0% leak for racing applications lol
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miniguru27
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Re: Leak down numbers
Reply #2 - 01/17/10 at 10:27pm  
I would say no more than 5% total.Anything more i would be doing a valve job to start with.JMO
                                       Mike Weigel
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Re: Leak down numbers
Reply #3 - 01/19/10 at 9:06am  
  I see 20% all the time on new crate motors.  Just make sure you are even between cylinders.  The quality of your gauge matters too.  You will obviously see higher numbers on a cold engine.
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3racer
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Re: Leak down numbers
Reply #4 - 01/19/10 at 1:24pm  
Thanks for the help.  Turns out one of the holes was leaking pretty bad.  Upwards of 30%.  Rebuild time.  Thanks again.
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imracin68j
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Re: Leak down numbers
Reply #5 - 01/20/10 at 7:58pm  
If you're not seeing smoke out of the breathers I wouldn't worry about it.  Some motors are loose at cooler temps.  Throw a compression guage and see if you see a big difference between the cylinders.
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Re: Leak down numbers
Reply #6 - 01/22/10 at 9:45pm  
Depends on your rings too, gapless or standard.

Duane
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