Differences
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techtalk:ref:oil21 [2022/08/18 17:41] hippysmack [Oil Grooves in Bushings] |
techtalk:ref:oil21 [2022/09/10 02:49] hippysmack [Oil Tank Head Pressure] |
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| In that case, the static pressure would go down to around .225 PSI at operating temp. \\ | In that case, the static pressure would go down to around .225 PSI at operating temp. \\ | ||
| - | Lowering the oil level to the low mark on the dipstick will lower the pressure at the oil pump. \\ | + | Lowering the oil level to the low mark on the dipstick will lower the pressure at the oil pump slightly. \\ |
| + | But it is not gravity that actually pulls oil into the pump. It's vacuum created by the gears / gerotors that does most of the oil gathering. \\ | ||
| + | A change in location elevation from sea level can also change the pressure at the oil pump. \\ | ||
| The mark is there as a minimum oil level to attain enough pressure at the pump to keep down cavitation in the oil pump. \\ | The mark is there as a minimum oil level to attain enough pressure at the pump to keep down cavitation in the oil pump. \\ | ||
| - | A change in location elevation from sea level will change the pressure at the oil pump. \\ | + | |
| - | The roughness of the feed hose ID will lower pressure at the pump due to the affects of friction. \\ | + | Below are some examples of things that could lead to pump cavitation; \\ |
| - | Kinks in the feed hose or internal shrinkage of the inside walls of the feed hose will lower pressure at the oil pump. \\ | + | * The roughness of the feed hose ID can lower pressure at the pump due to the affects of friction. |
| - | Changing the inlet fitting to a smaller ID will lower pressure on the hose side of the fitting. \\ | + | * Kinks in the feed hose or internal shrinkage of the inside walls of the feed hose can lower pressure at the oil pump. |
| - | The static pressure at the inlet is changed further upon vacuum from the oil pump inlet. \\ | + | * Changing the inlet fitting to a smaller ID can lower pressure on the hose side of the fitting. \\ The static pressure at the inlet is changed further upon vacuum from the oil pump inlet. \\ The hose fitting is a restriction where flow (from vacuum)of pump gear action lowers static on the hose pressure. \\ |
| - | The hose fitting is a restriction where flow (from vacuum)of pump gear action lowers static on the hose pressure. \\ | + | |
| {{:techtalk:ref:oil:sportster_oil_pressure_-_oil_tank_head_pressure_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | {{:techtalk:ref:oil:sportster_oil_pressure_-_oil_tank_head_pressure_by_hippysmack.png?direct&400|}} ((drawing by Hippysmack)) \\ | ||
