An auto engine might make it's max rated hp at 4500rpm where-as a tractor engine makes its max power at anywhere from 975 to 2200 rpm. they are made to sustain max power all day long in the field under load and will do it for many many years. Try running a car engine in a tractor in the field under load at 4500 rpm or higher if so rated , and see just how long it will last. If you throttle it back to 2000 rpm to make it last then it won't have enough torque to pull through a mud hole. A car engine is designed to have great reserve power for just short spurts when you need it and the rest of the time it "loafs". Tractor engines are made to work all day and car engines are made to loaf all day unless needed to get through a yellow light or occasional drag race.
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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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