Most diesels make low end torque and most gas engines make high end power because that's what their designers intended them to do, not because there in anything inherent in one or the other that dictates that result. Cam profile/duration and stroke length are largely what dictates engine breathing, thus it's torque curve.
If you were to root out the nebraska test results for the Ford 3000 and 5000 tractors in both the gasoline and diesel versions using the 175 cid and 233 cid engines respectively I believe you'll find that they have almost identical curves... much to the point that the profiles are the same excepting that the spark engine will probably achieve peak torque at 100-150 rpm faster than the diesel. This will result in the spark engine being a bit prouder on the top end because the torque rise was basically identical to the diesel. Again... SAME cam shaft in both. Same lift. Same duration. Same stroke and displacement.
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Today's Featured Article - Talk of the Town: Winterizin Engines - To Drain or Not to Drain? - by Staff. Another great discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "Winter is fast approaching..for a gas tractor should the gas tank be drained and run the engine til the carb is dry or do the gas stabilizer products I've heard of work? (tractor will not be used til spring) any other tips for winterizing?? "
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