Dry Sump Pump performance curves
Dry Sump Pump performance curves
(OP)
I am working on a dry sump retrofit project for the VG30DETT engine in a Nissan. I have machined a piece of aluminum to drive the oem oil pump to get an idea of the flow rate vs RPM and head in order to size the dry sump pump accordingly. I will be testing it sometime this week.
I thought that aftermarket dry sump pump performance curves would be readily available for proper sizing of the drive ratio..but I guess I am wrong. I called Moroso inquiring about this, and they say that it is internal information...
Anyone have any recommendations or data on any popular or applicable multi-stage dry sump pumps? Doesn't make sense to me to just run the pump at half engine speed blindly..
I thought that aftermarket dry sump pump performance curves would be readily available for proper sizing of the drive ratio..but I guess I am wrong. I called Moroso inquiring about this, and they say that it is internal information...
Anyone have any recommendations or data on any popular or applicable multi-stage dry sump pumps? Doesn't make sense to me to just run the pump at half engine speed blindly..





RE: Dry Sump Pump performance curves
With dry sump scavenge pumps, the scavenge volume flow should be anywhere from 2 to 4 times the pressure pump volume flow.
Gear type pressure pump drive speeds are usually based on a max inlet flow velocity of 6 ft/sec or less to prevent cavitation. Gerotor type pumps use lower inlet flow velocities, since the inlet flow must turn a corner.
You can calculate the flow velocity if you know the inlet port area and the displaced volume per rev of the pump section. Select a pulley ratio that gives you a safe inlet flow velocity at max engine speed.
Here's a gerotor pump reference:
http://www.vianenterprises.com/Sizing.htm
Hope that helps.
Terry
RE: Dry Sump Pump performance curves
The leakage on the scavenge side will be lower than the leakage on the pressure side as the pressures are a lot lower, like almost zero.
Regards
Pat
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