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techtalk:ref:oil10 [2019/06/04 04:38] hippysmack [Is your Engine Wet Sumping?] |
techtalk:ref:oil10 [2019/06/21 03:47] hippysmack [Wet Sumping] |
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| See also [[techtalk:ref:oil05#engine_and_primary_oil_system_modifications|Engine and Primary Oil System Modifications]] in the REF section of the Sportsterpedia. \\ | See also [[techtalk:ref:oil05#engine_and_primary_oil_system_modifications|Engine and Primary Oil System Modifications]] in the REF section of the Sportsterpedia. \\ | ||
| - | Wet sumping is condition of oil collecting in the bottom (sump) area the crankshaft. \\ | + | Wet sumping is a condition between the flywheels and the scavenge passage. \\ |
| + | Oil collects in the bottom (sump) area the crankshaft when the oil is not scavenged out fast enough (or during extended shutdown periods) \\ | ||
| + | When the oil balance between feed and scavenge is correct, there should be very little oil gathering in the sump during operation. \\ | ||
| + | However, the sump should not be dry during operation. \\ | ||
| + | A dry sump system simply means the oil supply is not stored in the crankcase as does V-8's. \\ | ||
| + | Instead, the oil supply is stored in the external tank. \\ | ||
| + | During wet sumping, sump oil is churned by the flywheels, air attaches to it leaving (not all but) some of it in the sump longer. \\ | ||
| + | Oil drags the wheels, heat rises and this affects crankcase pressure balance. \\ | ||
| + | It also adds more drag on engine parts to increase engine wear. \\ | ||
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| + | How sumped oil plays into engine breathing is it allows more oil in the sump to be picked up and slung out the breather vent. | ||
| + | If there wasn't much oil in the sump and the breather vent fails, you get less oil out the A/C even though engine breathing was compromised. | ||
| + | It's a balance. But even then, normal splash oil would be seen out the breather. \\ | ||
| It can be attributed to inhibiting crank rotation until the excess oil is returned to the oil tank by the scavenge side of the oil pump. \\ | It can be attributed to inhibiting crank rotation until the excess oil is returned to the oil tank by the scavenge side of the oil pump. \\ | ||
| In extreme cases, it can also be attributed to engine wear, i.e. racing applications. \\ | In extreme cases, it can also be attributed to engine wear, i.e. racing applications. \\ | ||
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| Acceleration is hampered until the oil clears the crank area. \\ | Acceleration is hampered until the oil clears the crank area. \\ | ||
| - | **Known causes of wet sumping**: \\ | + | **Known causes of wet sumping during engine down time**: \\ |
| + | This is simply oil from the tank draining slowly back down into the crankcase while the bike is parked for any length of time. ((Hopper of the XLFORUM http://xlforum.net/forums/showthread.php?t=518948&highlight=cam+chest+breather)) \\ | ||
| + | When you start the engine, the excess oil in the crankcase is fired out the breather, onto the floor, (or into your air-filter on post-79 models). \\ | ||
| * **Oil Pump**: | * **Oil Pump**: | ||
| * Worn / damaged oil pump scavenge gears or gerotors (respectively). \\ The oil pump can't return as much oil to the oil tank as it is receiving from the feed side of the pump. | * Worn / damaged oil pump scavenge gears or gerotors (respectively). \\ The oil pump can't return as much oil to the oil tank as it is receiving from the feed side of the pump. | ||
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| |77-E87 check valve ((photo by Hippysmack))|Check valve in 77-85 oil pump ((photo by Hippysmack))|Check valve in 86-E87 filter pad ((photo by Hippysmack))| | |77-E87 check valve ((photo by Hippysmack))|Check valve in 77-85 oil pump ((photo by Hippysmack))|Check valve in 86-E87 filter pad ((photo by Hippysmack))| | ||
| |{{:techtalk:evo:oil:77-e87_oil_check_valve_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_check_valve_installed_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-e87_oil_check_valve_location_2_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:77-e87_oil_check_valve_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:ih:oil:77-85_oil_pump_check_valve_installed_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:86-e87_oil_check_valve_location_2_by_hippysmack.jpg?direct&300|}}| | ||
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| A small particle of debris may be lodged at the seat position of the check ball keeping the passage open. \\ | A small particle of debris may be lodged at the seat position of the check ball keeping the passage open. \\ | ||
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| |{{:techtalk:evo:oil:l87-90_check_ball_and_spring_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:l87-90_check_ball_and_spring_5_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:l87-90_check_ball_and_spring_1_by_hippysmack.jpg?direct&300|}}|{{:techtalk:evo:oil:l87-90_check_ball_and_spring_5_by_hippysmack.jpg?direct&300|}}| | ||
| + | **Known causes of wet sumping during engine operation**: \\ | ||
| * **Oil Line(s)**: | * **Oil Line(s)**: | ||
| * An oil may be pinched / collapsed, or stopped up. \\ A blockage in the return line will not allow the scavenge pump to remove the oil from the sump or move it out fast enough to keep up with feed oil from the pump. | * An oil may be pinched / collapsed, or stopped up. \\ A blockage in the return line will not allow the scavenge pump to remove the oil from the sump or move it out fast enough to keep up with feed oil from the pump. | ||
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| |1986-90 Oil Filter Mount ((photo Hippysmack of the XLFORUM))| | |1986-90 Oil Filter Mount ((photo Hippysmack of the XLFORUM))| | ||
| |{{:techtalk:evo:oil:86-90_oil_pressure_regulator_by_hippysmack.jpg?direct&300|}}| | |{{:techtalk:evo:oil:86-90_oil_pressure_regulator_by_hippysmack.jpg?direct&300|}}| | ||
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| ====== Is your Engine Wet Sumping? ====== | ====== Is your Engine Wet Sumping? ====== | ||
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| - | ===== aswracing on rubbermount wetsumping: ===== | + | ===== aswracing on rubbermount wet sumping at high revs: ===== |
