REFLECTOR: Oil temps

Al Gietzen ALVentures at cox.net
Mon May 28 17:49:27 CDT 2007


 

 

I see higher oil temps at higher rpms also.  I think the reason is that the
oil pump is a positive displacement pump which means the amount of oil
pumped is proportional to rpm.  The cooler can not cool a greater flow down
to the same temp as a lower flow. 

John 
SERG/Franklin 

Other things being equal; higher flow results in a higher heat rejection
capability.  It decreases the fluid side temp drop, which increases the
average temperature, and if the air temp is the same; increases the average
delta T from fluid to air, increasing the heat rejection.  I know; it may
seem counterintuitive, but the thermodynamics works that way.  

The increased rpm increases the hp a bit, and would increase the oil temp.

Al

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