stock or hv oil pump

How does a high volume pump, at the same oil pressure as a standard pump, push more oil through the same engine clearances?
The impeller is taller which moves more oil at a faster rate.. I would turn my motor with the ign off until I saw the pressure gauge move.. Do to the remote oil filter and oil cooler The HV pump would make the gauge react much quicker. You really don't need much pressure on a solid lift motor. Harleys only have about 3 lbs. Pressure will just wash the bearings out on a babit engine. But you need constant oil flow to fill the clearances. This is one reason a HV pump is a good replacement for a motor with high mileage and worn with wider clearances.

Running a cooler you need flow so it cools. I had a oil temp gauge in my car . I was having overheating problem due to a bad rad that I couldn't figure out. My motor was running at 220 - 240 coolant temp at the time on the street. The oil cooler would keep the oil much cooler for a longer distance. Now that the cooling problem was corrected before the accident occured I will not be reusing the cooler when rebuilding the car. I may still be keeping the HV pump due to the remote filter.

The pictures below show the remote filter and the cooler peeking through the grille. That is a long distance for the oil to travel and the reason I use a HV pump. I use the remote filter because of the 2 inch tube headers. We could not change the the large WIX filter unless I removed the rear tube. I could get it off just couldn't get it out. With the new K-member I may be able to eliminate that whole system. Weight??? We'll see

One thing I thought I would mention. Even though I had an 8 quart milodon Pan I ran it one quart low on the dipstick.
It never sucked it dry I had a big red light in the car . The light never came on not even over 9000 RPM's. With a HV pump. The engine still needed a total of 8 quarts to fill the cooler and remote filter lines.

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