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Old Aug 20, 2011 | 09:36 AM
  #1  
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Argess
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Laughing Gas
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Compression Testing Question

My FE experience has been limited to solid lifters, but I have a question.

When performing a compression check on a hyd lifter engine, can the lifters bleed down enough (during cranking) that by the time you get to the last few cylinders, the cylinder pressure becomes significantly lower?

If so, it might be yet another good reason for doing leak-down tests instead.
 
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Old Aug 20, 2011 | 11:57 PM
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Hypoid
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The short answer is no.

If you are cranking, you should be pumping oil.
 
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Old Sep 3, 2011 | 11:16 PM
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neon tony
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leakdown will miss valvetrain probs like flat cam lobe or bent pushrod.
 
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