I am going to be resealing my engine in a few weeks and wanted to ask this question before I bought a new oil pump. The original post about these high volume oil pumps is here: http://www.ultimatesubaru.org/forum/showthread.php?s=&threadid=6294&highlight=high+volume+oil+pump

 

I heard that a high volume oil pump is only needed if you are using larger clearances at the bearings, otherwise it robs power. So should I use a HV Oil Pump or should I stick with OEM?

 

Also, after watching "Horsepower TV," I think what we really want is a High Pressure Oil Pump. So if anyone knows where to get a High Pressure Oil Pump then please let me know.

I know I kind of answered my own question, but I would still like to get everyones opinion on HV oil pumps.

I would use it.

Higher pressure in an engine that doesn't need it does nothing but rob power and make it more prone to leakage. A new standard pump will give you plenty of pressure.

the high pressure or volume oil pump will do nothing on a stock or mildly built engine, it will rob power, the high volume is only necessary if you are not getting the pressure that you need, which would be from bigger clearances or running the engine at a higher RPM, stick with a subaru OEM and you will be fine