The original Farmall Cub conversion was part of some other custom work, a tricycle cub, being done. Despite what was said, the Cub clutch, drive line, camshaft, carburetor, and crankshaft are more than strong enough or large enough for the 4 cylinder to 2 duel cylinder conversion. The horsepower will not be significantly larger or smaller although the torque curve will likely change.
The camshaft was cut in half at the center bearing and rotated. Just one cut not 3. There are custom camshaft folks that could also have made the camshaft. The ignition system was composed of 2 duel spark motorcycle coils,each firing 2 cylinders at the same time. Three of the 4 distributor lobes were ground smooth and the remaining lobe opened and closed the points. An additional set of points was added 90 degrees from the original set. One set of points went to one coil which fired pistons 1,4. The second set of points went to the second coil and fired pistons 2,3. The rotor etc... was not needed.
I don't think anyone doing this type of conversion believes it will result in a pot of gold at the end of all the rainbows in the world nor will it place the bluebird of happiness on everyone's shoulder, it is just something interesting to do, for those that like the sound of a 4 cylinder engine then don't do the conversion. It is just a tractor engine not a cure for cancer.
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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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