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techtalk:ref:oil05f [2022/05/15 21:10] hippysmack [Sportster oil pumps] |
techtalk:ref:oil05f [2022/05/15 21:26] hippysmack [Reason this mod came to be] |
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(thereby lowering the possible return flowrate from the sump) \\ | (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. \\ | 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. \\ | ||
+ | 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 ====== | ||
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|{{: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 ====== |