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techtalk:ref:oil04 [2019/06/18 01:47] hippysmack [Crankcase Pressure / Venting in the Oil Tank] |
techtalk:ref:oil04 [2019/11/14 01:43] hippysmack [Crankcase Pressure / Venting in the Oil Tank] |
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In the drawings below, a syringe is used to example crankcase pressure being applied into the oil tank: \\ | In the drawings below, a syringe is used to example crankcase pressure being applied into the oil tank: \\ | ||
- | {{:techtalk:ref:oil:oil_pressure_drawing_1_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) {{:techtalk:ref:oil:oil_pressure_drawing_4_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) | + | {{:techtalk:ref:oil:oil_pressure_drawing_1a_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) {{:techtalk:ref:oil:oil_pressure_drawing_4a_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) |
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So, in essence, the oil tank acts as an oil / air separator like the breather valve but the air only expels the engine from the engine's breather vent. \\ | So, in essence, the oil tank acts as an oil / air separator like the breather valve but the air only expels the engine from the engine's breather vent. \\ | ||
- | {{:techtalk:ref:oil:oil_pressure_drawing_2_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) | + | {{:techtalk:ref:oil:oil_pressure_drawing_2a_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) |
- | {{:techtalk:ref:oil:oil_pressure_drawing_3_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) | + | {{:techtalk:ref:oil:oil_pressure_drawing_3a_by_hippysmack.jpg?direct&450|}} ((drawing by Hippysmack)) |
The piston movements in the HD engine are not in apposing positions to balance out the displacement of air. \\ | The piston movements in the HD engine are not in apposing positions to balance out the displacement of air. \\ | ||
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See more here [[techtalk:ref:engmech04|Evo Crankcase Pressure]] on engine breathing, crankcase pressure and blowby in the REF section of the Sportsterpedia. \\ | See more here [[techtalk:ref:engmech04|Evo Crankcase Pressure]] on engine breathing, crankcase pressure and blowby in the REF section of the Sportsterpedia. \\ | ||
- | If the oil tank vent line is plugged up, the oil pump will still send air/oil pressure into the tank. \\ | + | **If the oil tank vent line is plugged up**, the oil pump will still send air/oil pressure into the tank. \\ |
The air pressure can't leave the tank but the oil is recirculated from the tank into the engine by the feed side of the pump. \\ | The air pressure can't leave the tank but the oil is recirculated from the tank into the engine by the feed side of the pump. \\ | ||
Pressure will build in the tank until the cap blows, oil leaks from the cap or the oil tank splits (plastic). \\ | Pressure will build in the tank until the cap blows, oil leaks from the cap or the oil tank splits (plastic). \\ |