[SEL] OT - expansion of metals in oil pumps

Rob Skinner rskinner at rustyiron.com
Mon Mar 28 17:54:22 PST 2005


> For the engineers - rob, etc.
> 
>Engine oil pump - automotive gear type. Gears are steel (or
>some sort of steel product) housing is aluminum - timing
>chain cover with pump body in the timing cover. The gear
>to housing end clearance is supposed to be VERY close to
>get the pump to put out good pressure. A lot of folks say
>this is a weak design - that the aluminum will expand more
>and open clearances between the gears and the housing.
>They claim the fix is to use aluminum gears in the alum
>housing so they expand at the same rate, meaning a more
>accurate and tight pump, longer life, higher pressure, etc.
> 
> Thoughts?
> 
> Bill



Under full load, about three drops per minute per horsepower.  

Rob







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