Differences
This shows you the differences between two versions of the page.
Both sides previous revision Previous revision Next revision | Previous revision Last revision Both sides next revision | ||
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 21:31] hippysmack [Testing] |
||
---|---|---|---|
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|}}| | |{{: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. \\ | ||
+ | |||
+ | ==== Testing ==== | ||
+ | 1986-1997 engines drain the gearcase into the crankcase sump area to be scavenged by the sump drain to the oil pump. \\ | ||
+ | 1998-up engines drain the gearcase straight into the oil pump. \\ | ||
+ | However, the 07 pump is preferred as it has bigger scavenge gerotors that carry more oil out of the engine than it's predecessor. \\ | ||
+ | So testing was done on the 2007 pump to determine flow rate. \\ | ||
+ | The pump was tested before and after the modification in Karlings oil pump test rig. \\ | ||
+ | |||
+ | During the flow test, they used a reference volume filled from the scavenge outlet. \\ | ||
+ | The pump was driven at a controlled shaft speed and partially immersed in a low viscosity fluid to resemble the viscosity of hot engine oil. \\ | ||
+ | When the cam chest suction port was allowed to suck air, (sump suction port immersed in liquid), the pump needed 22 seconds to fill the reference volume. \\ | ||
+ | With this mod, (also the internal gerotor kidney was machined to optimize sump port scavenge capacity), pump only needed 13.5 seconds to fill the reference volume. \\ | ||
+ | The testing determined that the 2007 oil pump gained 63% scavenge capacity when the oil pumps cam chest scavenge port was modified (blocked off). \\ | ||
+ | |||
+ | Then the plausible consequence (without modding) was that the engine wetsumps the crankcase to a level that is sufficient to flood the lower part of the cam chest. \\ | ||
+ | Not until then will the full oil pump scavenge capacity be used. \\ | ||
====== Considerations ====== | ====== Considerations ====== | ||
Line 122: | Line 150: | ||
|{{:techtalk:evo:oil:2007_and_up_oil_pump_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:2007_and_up_oil_pump_5a_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:2007_and_up_oil_pump_2_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:2007_and_up_oil_pump_5a_by_hippysmack.jpg?direct&300|}}| | ||
- | ====== Testing ====== | ||
- | |||
- | The reason for testing was due to the 07-up pump having a drain port (on top of the pump body) to drain the gearcase. \\ | ||
- | 86-97 engines drain the gearcase into the crankcase sump area to be scavenged by the sump drain to the oil pump. \\ | ||
- | 98-up engines drain the gearcase straight into the oil pump. \\ | ||
- | However, the 07 pump is preferred as it has bigger scavenge gerotors that carry more oil out of the engine than it's predecessor. \\ | ||
- | |||
- | The pump was tested before and after the modification in Karlings oil pump test rig. \\ | ||
- | |||
- | During the flow test they used a reference volume filled from the scavenge outlet. \\ | ||
- | The pump was driven at a controlled shaft speed and partially immersed in a low viscosity fluid to resemble the viscosity of hot engine oil. \\ | ||
====== Results ====== | ====== Results ====== |