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Anyone know how an oil pump draws a prime?
genee/rickie claim that oil pumps have to spin for some time to draw a prime.
I am trying to visualize how an oil pump draws a prime, particularly on oil at say 15 degrees. In order to draw a prime the pump would have to evacuate the air above the oil and below the pump, the difference in air pressure on the evacuated side vs ambient air pressure leaves no more than a few pounds of pressure total (can't be more than 14.7# total, for that is atmospheric pressure). Then the oil would have to vaporize and then be drawn into the pump, then to be compressed back to liquid to then be pumped to the bearings needing pressure oil. At even normal room temperature engine starts -- let alone cold weather engine starts -- it would seem an oil pump requiring a prime to work might take several minutes engine run time to begin to pump even small amounts of oil. Anyone know how the engine designers allow for this and still make the engines last more than a minute or so? Anyone know of which engine designs have oil pumps that have to pull oil up before pressurizing it? How do they get the oil volume on such oil pumps? |
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