Janicholson said: (quoted from post at 04:44:34 07/21/09) I'm glad. I made a mess once with light oil in a cleaner cup. Engine intake pulses are actual and capable of moving oil against logical processes. Jim
In order to get the intake valve open quickly enough for optimum performance the intake opens a little before TDC. There is still some residual exhaust pressure left in the cylinder at this point in the cycle. There also is a vacuum in the intake manifold so that as the intake opens some of the exhaust gases push into the intake system. Under light load there is enough vacuum in the manifold that it probably is not able to move the oil up the pipe. Under full load there is very little vacuum and also there is a lot more exhaust pressure so that is most likely when the oil is thrown up the pipe.
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