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techtalk:ref:oil20 [2022/06/08 21:22] hippysmack [Crankcase Pressure / Venting the Oil Tank] |
techtalk:ref:oil20 [2022/09/10 02:52] hippysmack [Oil Tank Pressure] |
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| ====== REF: Oiling & Lubrication ====== | ====== REF: Oiling & Lubrication ====== | ||
| ====== Oil Tank Pressure ====== | ====== Oil Tank Pressure ====== | ||
| + | See also, [[techtalk:ref:oil21#oil_tank_head_pressure|Oil Tank Head Pressure]] in the Sportsterpedia. \\ | ||
| There should not be any noticeable pressure in the oil tank due to the generated pressure being vented back into the cam chest. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5736179#post5736179)) \\ | There should not be any noticeable pressure in the oil tank due to the generated pressure being vented back into the cam chest. ((Hippysmack of the XLFORUM http://xlforum.net/forums/showthread.php?p=5736179#post5736179)) \\ | ||
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| That air is full of condensate. A slightly negative (to atmospheric) pressure in the tank facilitates vaporization of the condensate. \\ | That air is full of condensate. A slightly negative (to atmospheric) pressure in the tank facilitates vaporization of the condensate. \\ | ||
| - | * **1977-2003 Sportsters use oil pump scavenge and the oil tank to remove __some__ of the crankcase air into the cam chest**. \\ There are holes in the cam walls for crankcase air to escape into the cam chest and head drains that carry crankcase air when not flooded with oil. | + | * **1977-2003 Sportsters use oil pump scavenge and the oil tank to remove __some__ of the crankcase air into the cam chest**. \\ However, there are also holes in the cam walls for crankcase air to escape into the cam chest and head drains to the crankcase. \\ These holes carry crankcase air out to the cam chest without using the oil pump. \\ The oil pump does still have bigger feed gerotors that will pick up crankcase air to the oil pump also. \\ But the crankcase is not bottled up like 2004-up motors. |
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| * **2004-Present Sportsters use oil pump scavenge and the oil tank to move __most__ of the crankcase air into the cam chest**. \\ Some goes out the pinion shaft bearing clearances but the only other outlet for piston downstroke air is the oil pump. \\ The source of air intake to the crankcase on piston upstroke is the pinion shaft bearing clearance. \\ The oil pump is steadily pushing oil and air out of the crankcase into the oil tank and then into the cam chest / rocker boxes to the head vents. | * **2004-Present Sportsters use oil pump scavenge and the oil tank to move __most__ of the crankcase air into the cam chest**. \\ Some goes out the pinion shaft bearing clearances but the only other outlet for piston downstroke air is the oil pump. \\ The source of air intake to the crankcase on piston upstroke is the pinion shaft bearing clearance. \\ The oil pump is steadily pushing oil and air out of the crankcase into the oil tank and then into the cam chest / rocker boxes to the head vents. | ||
