This has been very interesting and enlightening. Perhaps you can shed some light on a problem that I'm having.

The engine is a 351 SBF with a Canton Road Race Pan and High Volume Oil Pump and an assortment of other performance parts. On the engine dyno the engine showed a steady 62.5 psi of oil pressure from 3,000 rpm to 6,500 rpm. The oil pressure was taken at the standard location just above the oil filter. A standard oil filter was used.

The engine was then installed in the car using a Canton remote filter adapter which is plumbed to a remote filter and then to an oil cooler using -10 line.

The oil pressure gauge in the car is hooked in the same place as the oil pressure was taken on the engine dyno. A second oil pressure gauge was hooked up on the output side of the remote filter but before the oil cooler.

When the engine is rev'd past 4,500 rpm (standing still or on the road makes no difference) the oil pressure on the primary gauge drops from 45-50 psi to 30-35 psi. The second oil pressure gauge shows a constant 50 psi with no variation.

Any idea of where the oil pressure is going?

I'm thinking that this isn't cavitation of the pump since the pressure after the filter stays constant. It makes me think that there is a restriction limiting flow so that over 4,500 rpm there isn't enough flow to maintain pressure. Possibly crud in the oil cooler.

All ideas are welcome...

Thanks very much....
Herb