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techtalk:ref:oil15 [2019/06/13 02:26]
hippysmack [Testing at the rocker box]
techtalk:ref:oil15 [2019/06/13 02:28] (current)
hippysmack [Testing at the rocker box]
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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.