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      08-22-2021, 08:03 PM   #1
Jonjt
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Drives: 09 E92 335i M-sport
Join Date: May 2012
Location: USA

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Cold Compression Test and Leakdown Test Results

Folks,
I recently did a cold compression and leak down test on my N54. The results are below:

Compression
1: 150psi
2: 100psi
3: 100psi
4: 115psi
5: 115psi
6: 145psi

Leak down:
1: 90psi at 90psi, audible leak
2: 85psi at 90psi, audible leak
3: 85psi at 90psi, audible leak
4: 90psi at 90psi, audible leak
5: 90psi at 90psi, audible leak
6: 90psi at 90psi, audible leak

I suspect that the compression tests were so unusual because the engine was cold. The results of the leak down test seem to further suggest this. At this point, I'm nearly ready to fix/service the car for another ~2 years of use, but I wanted to verify my suspicions before going forward. Are my conclusions correct?

Thanks,

Last edited by Jonjt; 08-22-2021 at 10:21 PM..
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