If you are talking about a radial aircraft engine, the problem was oil settling in the lower cylinders and if started as such would blow the head off or something of the sort. Usually you saw the ground crew rotating the prop a few revs, and then the flight engineer would cut the spark for a few revs and then when he switched it on the engine would light off and this belch of blueish smoke would come billowing forward. I think I read somewhere that the B-17 carried 55 gallons of oil for use in each mission.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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