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Leakdown results question

 
Old 06-04-2015, 07:03 PM
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LPMM
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Default Leakdown results question

I had a PPI done and following the results and the seller's asking, I decided to pass. The seller is now coming back to me asking me what my best offer is. There were a few things uncovered during the PPI but the biggest "problem" seems to be the leakdown results. The test was performed cold and the numbers are (from cylinder 1 through 6): 7% - 12% - 8% - 5% - 30% - 6%. The shop found no obvious leak and believes the rings have lined up so that it is going down the cylinder head, past the rings, and into the crankcase.

How bad is it with cylinder 5 at 30% while others are consistent but much lower? Trouble for my wallet in the no so distant future?
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Old 06-04-2015, 10:42 PM
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Mixter
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The test should be done with the engine at operating temperature.

Under 5% - awesome
Under 10% - good
Under 15% - acceptable
Over 20% - bad news for your bank account

As per this thread.

https://rennlist.com/forums/964-foru...mpression.html
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Old 06-05-2015, 02:52 AM
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Steve Weiner-Rennsport Systems
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Originally Posted by Mixter View Post
The test should be done with the engine at operating temperature.

Under 5% - awesome
Under 10% - good
Under 15% - acceptable
Over 20% - bad news for your bank account

As per this thread.

https://rennlist.com/forums/964-foru...mpression.html
Thats pretty darned accurate, but JUST as important, the technician performing these tests must listen for the source of any observed leakage, otherwise its a waste of time.

You really need to know whether excess leakage comes from the valves or the rings/cylinders/pistons.
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