They both have a magical rpm limit somewhere around half throttle that they will do ok. Once they have surpassed that limit, all bets are off. At this point the popping, snapping, and surging starts. The harvester engine has an electric fuel pump, so it'll tend to want to start to flood from lack of being able to burn the fuel. The hiboy has a gravity fed tank. It'll just fade out, then surge back several times until a lighter load is applied, or throttle position reduced like the harvester. If half throttle would be fast enough I'd live with it but both machines need 2000 plus rpm to function properly.
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Today's Featured Article - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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