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techtalk:ref:oil10 [2019/06/22 05:34] hippysmack [Wet Sumping] |
techtalk:ref:oil10 [2020/05/08 01:14] hippysmack [Wet Sumping] |
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| * [[techtalk:ref:engmech04|Evo Crankcase Pressure]] | * [[techtalk:ref:engmech04|Evo Crankcase Pressure]] | ||
| * [[techtalk:ref:oil05#engine_and_primary_oil_system_modifications|Engine and Primary Oil System Modifications]] | * [[techtalk:ref:oil05#engine_and_primary_oil_system_modifications|Engine and Primary Oil System Modifications]] | ||
| + | * [[techtalk:ref:engmech05#breather_venting_relocation|Breather Venting / Relocation]] | ||
| Wet sumping is a condition between the flywheels and the scavenge passage. \\ | Wet sumping is a condition between the flywheels and the scavenge passage. \\ | ||
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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 during engine down time**: \\ | + | Engine oil sumping can be broken down into two catagories. \\ |
| + | 1. Wetsumping \\ | ||
| + | 2. Sit sumping \\ | ||
| + | |||
| + | **Known causes of wet sumping during engine operation**: \\ | ||
| + | * **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. | ||
| + | * On ironhead engines with the oil filter in the return line, a stopped up oil filter can hinder adequate oil flow out of the engine. | ||
| + | * A blockage in the vent line from the oil tank to the cam chest can prevent proper oil return pressure from going to the oil tank. | ||
| + | * **86-91 engine oil pressure regulator**: | ||
| + | * The discharge from the relief valve drains down into the gearcase. \\ Then that 'extra' oil and is routed to the crankcase sump through a hole in the case wall and gets pumped back to the tank. \\ The 'extra' oil adds volume to the sump, thus adds towards a wet sumping condition. \\ A weak spring or a bad seat at the plunger will cause the regulator to open more often and / or unnecessarily increasing the possibility of wet sumping while riding. | ||
| + | |||
| + | |1986-90 Oil Filter Mount ((photo Hippysmack of the XLFORUM))| | ||
| + | |{{:techtalk:evo:oil:86-90_oil_pressure_regulator_by_hippysmack.jpg?direct&300|}}| | ||
| + | |||
| + | ====== Sit Sumpimg ====== | ||
| + | |||
| + | **Known causes of sit 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)) \\ | 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). \\ | 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). \\ | ||
| Line 48: | Line 66: | ||
| |{{: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)**: | ||
| - | * 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. | ||
| - | * On ironhead engines with the oil filter in the return line, a stopped up oil filter can hinder adequate oil flow out of the engine. | ||
| - | * A blockage in the vent line from the oil tank to the cam chest can prevent proper oil return pressure from going to the oil tank. | ||
| - | * **86-91 engine oil pressure regulator**: | ||
| - | * The discharge from the relief valve drains down into the gearcase. \\ Then that 'extra' oil and is routed to the crankcase sump through a hole in the case wall and gets pumped back to the tank. \\ The 'extra' oil adds volume to the sump, thus adds towards a wet sumping condition. \\ A weak spring or a bad seat at the plunger will cause the regulator to open more often and / or unnecessarily increasing the possibility of wet sumping while riding. | ||
| - | |||
| - | |1986-90 Oil Filter Mount ((photo Hippysmack of the XLFORUM))| | ||
| - | |{{:techtalk:evo:oil:86-90_oil_pressure_regulator_by_hippysmack.jpg?direct&300|}}| | ||
| - | |||
| - | |||
| Line 77: | Line 82: | ||
| * Overfilling the oil tank can increase wet sumping: | * Overfilling the oil tank can increase wet sumping: | ||
| * If you fill the tank (improperly), this will result in too much oil in the engine. \\ It can also result in oil blowing out the oil tank cap or breather(s). | * If you fill the tank (improperly), this will result in too much oil in the engine. \\ It can also result in oil blowing out the oil tank cap or breather(s). | ||
| + | |||
| + | **Lower oil level in the tank after a hard ride**. \\ | ||
| + | A good way to tell if your engine is wet sumping (during a hard ride) is to check the oil level right after a leisurely ride. ((NRHS Sales of the XLFORUM http://xlforum.net/forums/showthread.php?t=1738909&highlight=Oil+Usage)) \\ | ||
| + | Then go out and thrash the Hell out of the bike, immediately shut the bike off and check the oil level again. \\ | ||
| + | If it is a lot lower, then it is wet sumping. \\ | ||
| **A sudden loss of power while riding**. \\ | **A sudden loss of power while riding**. \\ | ||
