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Old 10-11-2012, 10:32 AM   #9
def
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Joined: Feb 2004
Location: The woods and mountains of Alabama
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Quote:
Originally Posted by jachard View Post
As a matter of curiosity I did the cold shut down test you outlined above and got ~12sec. on my bike. I would assume the longer the time, the better the health of the engine. Is there a number which indicates "bad"?

Cheers, James
This test is rather crude and would show signs of loose lower end bearings if the cold oil pressure was not sustained for several seconds as you observed.

The trick is to do this occasionally before you change oil and after you change oil. You'll get a reasonable baseline with which you can judge oil viscosity, engine bearing clearance and how temperatures effect oil viscosity and engine clearances.

I would speculate that good 15w-50 oil in a boxer with normal bearing clearances at 75 F. ambient, the ~12 seconds cold oil pressure bleed down you observed is normal.
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