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800 Leak Down Test Specifications

matchrocket

Well-known member
Premium Member
Mar 2, 2016
209
69
28
Boise
Per subject, what is the target % @ 100psi on a cold engine I should be looking for? What is considered NOK? My gauge shows up tomorrow, will check it then, but would like to understand what I should expect as OKAY, NOK.

I can't find anything on it in the service manual other than <15% delta between sides on compression. I found this thread on 850's... https://www.snowest.com/forum/threads/leakdown-results-post-em-up.447880/page-2 Seems 5% is the Target?
 

matchrocket

Well-known member
Premium Member
Mar 2, 2016
209
69
28
Boise
Based on #'s from the 850's from Indy Dan, I am in the GREAT category, 155 hours 2300 miles. 0.5% PTO / 2.5% Mag.
  • 0 to 2.5 great
  • 2.6 to 5.0 fair
  • 5.1 to 7.5 not good
  • 7.6 and above bad
 
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