Differences
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techtalk:ref:oil15 [2019/06/13 02:26] hippysmack [Testing at the rocker box] |
techtalk:ref:oil15 [2019/08/16 15:15] hippysmack [At case plug outside filter (91-up)] |
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* On a cold startup, the pressure is higher due to the thicker oil present. | * 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. | * 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. | + | * Pulsating 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 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. | * 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. | ||
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{{:techtalk:evo:oil:98_cam_chest_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | {{:techtalk:evo:oil:98_cam_chest_by_hippysmack.jpg?direct&300|}} ((photo by Hippysmack)) | ||
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+ | ===== From the Oil Pump ===== | ||
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====== IH ====== | ====== IH ====== | ||