Differences
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techtalk:ref:oil05f [2022/05/15 21:11] hippysmack [Testing] |
techtalk:ref:oil05f [2022/05/15 21:31] hippysmack [Testing] |
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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. \\ | ||
| + | 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 ====== | ||
