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--- techtalk:ref:oil05f [2019/08/17 19:03]
hippysmack [Modding a 98-up style Oil Pump For Use in 86-90 Engines]
+++ techtalk:ref:oil05f [2022/05/15 21:10]
hippysmack [Sportster oil pumps]
@@ Line 89: / Line 89: @@
 |{{:techtalk:evo:oil:86-90_oil_pump_oiling_paths_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:91-97_oil_pump_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:98-up_oil_pump_oiling_paths_by_bsaman.jpg?direct&300|}}|
+==== Reason this mod came to be ====
+During the 124" build, a 2007-up Sportster oil pump was installed. \\
+Upon dyno testing, it was revealed that there was a reduction in max power and torque pointing wetsumping at high RPM. \\
+Tests were also done running the bike at different rpms, then stopping the engine to drain and measure the volume of oil in the sump. \\
+These test also pointed to at wetsumping. \\
+Then, suspected culprit was the oil pump. The modern (1998-up) H-D oil pumps have a suction port in the cam chest. \\
+But unlike modern H-D cases, the S&S cases drain the cam chest to the crankcase sump. \\
+And that drain hole is situated at a lower point in the cam chest than the cam chest suction port to the oil pump. \\
+Then it was thought that the camchest suction port in the oil pump only delivers air into the oil return gerotor in this application. \\
+(thereby lowering the possible return flowrate from the sump) \\
+So the idea came about to close off the front drain port in the 2007 oil pump. \\
 ====== Considerations ======

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