Quote:
Originally Posted by James Rogers
PC, you don't have to push the oil up and out the tube, all you have to have happen is for the oil in the tube to stop flowing. Once the flow is stopped by the crankcase pressure caused by the up and down movement of the pistons, the oil returning through the rear main oil tube will overwhelm the slinger trough and run out the rear into the flywheel housing and out the cotter pin hole. I have personally had a tube fall off in my car and the leak was major and embarrassing to say the least. I have also rebuilt several engines with modified tubes that were too short that leaked quite badly.
Randall and George are right, especially George and his assessment of the pump's role in this. If you don't think the tube length matters, just cut one off 1" short and get ready to carry a gallon of oil with you on even short runs.
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I agree. It has to do with the surface tension out of the main. With the tube, it is submersed in the oil with no surface tension thus allowing the oil to flow back into the pan. He was lucky that he didn't get the major leak without the tube.