This is an old revision of the document!

REF: Oiling & Lubrication - Sub-22P


1977-Present Gerotor Oil Pump Capacities

The charts below are based on testing done by Hippysmack of the XLFORUM 1)
Overall oil pump volume was calculated by measuring the volume of one tooth cavity in used oil pumps and calculating volume against RPM.
The figures take into account that the oil pump turns 1/2 the speed of the engine.
Click Here for the full testing and procedure in the Sportsterpedia.

NOTE: The figures in the chart represent 100% pump efficiency and DO NOT take into account any amount of internal pump leakage.
Internal leakage (or slippage) is an inherent condition of these pumps and WILL affect total volume output.
Real world GPM will be lower than what is listed below.

1977-1985 Sportster Oil Pump Volume in (US) Gallons per Minute (GPM)
Year Model
Oil Pump →		 1977-1985 1986-1990 1991-1997 1998-2006 2007-Present
Oil
Pump
RPM ↓
Engine
RPM ↓		Feed
Gears		Return
Gears		Feed
Gears		Return
Gears		Feed
Gears		Return
Gears		Feed
Gears		Return
Gears		Feed
Gears		Return
Gears
1000.121.346.185.346.185.346.185.485 500
1500.182.519 750
2000.242.692 1000
2500.303.866 1250
3000.3641.039 1500
3500.4241.212 1750
4000.4851.385 2000
4500.5451.558 2250
5000.6061.732 2500
5500.6671.905 2750
6000.7272.078 3000
6500.7882.251 3250
7000.8452.424 3500
7500.9092.597 3750



1)
http://xlforum.net/forums/showthread.php?t=2081199
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Trace: • IH: Carburetor, Intake Manifold & Exhaust - Sub-01K • REF: Tools - 152 • REF: Carburetor, Intake Manifold & Exhaust • REF: Suspension • W E L C O M E ! • REF: Engine Mechanicals - Sub-01Q • REF: Carburetor, Intake Manifold & Exhaust • REF: Service Procedures 45 • REF: Oiling & Lubrication - Sub-22P