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techtalk:ref:oil04 [2024/02/02 23:26] hippysmack [Checking Oil Pressure] |
techtalk:ref:oil04 [2024/02/02 23:32] (current) hippysmack [Sportster Oil Pressure (57 to Present)] |
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| When checking oil pressure, it's important to note that you are not testing pressure at a dead stop standpoint (as in a dead end of pipe). The oil is flowing into the engine at the same time you are testing from the test site. And the resulting pressure reading is a reflection of current pressure near the source WHILE oil flows downstream and out from there. Oil pressure will be lower downstream of the oil pump depending on the restrictions in the oil path and how big the outlet holes in the top end as well as the pinion to flywheel path. \\ | When checking oil pressure, it's important to note that you are not testing pressure at a dead stop standpoint (as in a dead end of pipe). The oil is flowing into the engine at the same time you are testing from the test site. And the resulting pressure reading is a reflection of current pressure near the source WHILE oil flows downstream and out from there. Oil pressure will be lower downstream of the oil pump depending on the restrictions in the oil path and how big the outlet holes in the top end as well as the pinion to flywheel path. \\ | ||
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| + | **Rocker box oil pressure (Evo)**. \\ | ||
| + | Evo Oil pump pressure does feed up into the rocker arms via the lifters but is heavily restricted by the path through each lifter and slightly restricted further by elevation. \\ | ||
| + | * On a cold startup, the pressure is higher due to the thicker oil present which is also flowing slower (hence the higher pressure). \\ As the engine warms up, the oil thins out, pressure is reduced since the oil can flow faster. | ||
| + | * A PSI gauge tapped into any EVO Sportster rocker box will most likely measure crankcase air pressure instead of oil pressure. \\ It's not possible to accurately measure engine oil pressure from the rocker boxes. \\ Oil pump pressure is relieved once oil is sprayed / leaks out the rocker arms. And you can't actually attached a gauge to the rocker arms. | ||
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| + | **Cam cover oil pressure (All)**. \\ | ||
| + | Oil pump pressure is always present internally in the cam cover with the engine running. \\ | ||
| + | That is also a deceiving statement. Pump pressure runs through internal cavities in the cover to get from the top to the bottom of the cover and to the pinion shaft. \\ | ||
| + | However, oil pump pressure is confined internally in the cover and does not pressurize the cam chest. \\ | ||
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| ====== Checking Oil Pressure ====== | ====== Checking Oil Pressure ====== | ||
| [[techtalk:ref:oil15|Click Here]] to view "Installing an Oil Pressure Gauge" in the REF section of the Sportsterpedia. \\ | [[techtalk:ref:oil15|Click Here]] to view "Installing an Oil Pressure Gauge" in the REF section of the Sportsterpedia. \\ | ||
