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techtalk:ref:oil15 [2019/06/13 02:10] hippysmack [Between the oil pump and the filter (86-Up)] |
techtalk:ref:oil15 [2019/06/13 02:12] hippysmack [Rocker Box] |
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| - | ==== Rocker Box ==== | ||
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| - | A Sportster does produce oil pressure in the rocker box: reportedly 3-5 psi at hot idle and 15psi+ on cold startup on an ironhead. ((simeli of the XLFORUM http://xlforum.net/forums/showthread.php?t=263589&highlight=lower+oil+pump&page=4)) \\ | ||
| - | Depending on the gauge selected, there may be little to no oil pressure registered on a high range gauge testing form the rocker box. \\ | ||
| - | (the gauge may show some pressure when the oil is cool and thick but may not show any after 5 minutes of running) ((mycle1000 of the XLFORUM http://xlforum.net/forums/showthread.php?t=263589&highlight=lower+oil+pump&page=3)) \\ | ||
| - | Due to the low oil pressure at the rocker box, \\ | ||
| - | Don't get scared when you look down after its hot and its on zero. ((vyper202 of the XLFORUM http://xlforum.net/forums/showthread.php?t=1698960)) \\ | ||
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| - | * Residual crankcase pressure and working pressure from the lifters resides in the rocker boxes. | ||
| - | * On a cold startup, the pressure is higher due to the thicker oil present. | ||
| - | * As the engine warms up, the oil thins out and the pressure is reduced in the rocker boxes. | ||
| - | * Excess crankcase pressure (air and oil mist) is vented differently between pre and post 91 engines. | ||
| - | * On pre 91 engines, excess crankcase pressure is vented through the cam cover. | ||
| - | * On post 91 engines, excess crankcase pressure is routed up the pushrod tubes and vented thru the rocker boxes to exit a hole in each head. | ||
| - | * So, it is possible to notice different pressures from them with a pressure gauge testing from the rocker box. | ||
| - | * However, a gauge tapped into any rocker box will most likely measure air pressure instead of oil pressure. | ||
| - | * As air will compress and oil will not, therefore the readings should be lower than if you were testing at the oil pressure switch. | ||
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