Quote:
Originally Posted by RickInVA
Oil pump question. On the Burtz site there is a guide for modifying a stock oil pump to use on the engine. These insturctiions are to inlarge many of the openings on the stock pump. I was taught that a gear pump was a positive displacement pump. As long as the rpm remained fixed so does the output remain fixed. By changing various orfices you can change the velocity of fluid but not the volume. If this is the case, what do you achieve by opening up passageways other than slowing down the flow while the flow capicity remains the same. Granted, the physics class was long ago and I dont remember crap but i would like some help in understanding what is going on.
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I think the general idea is that, by widening the intake area, you expose the vanes of the pump to the oil sump for a longer amount of time on each rotation, which helps to ensure that the volume between the vanes is filled with oil. If you visualize a positive displacement pump spinning, but with only a tiny hole between it and the sump, you can see how the pump could potentially spin too fast for the liquid to flow into and fill up the empty volume in the pump.