Re: No low end torque

Posted by LenRahilly on December 16, 2006 at 08:20:14 from (24.50.99.60):

In Reply to: No low end torque posted by North Dakota H puller on December 16, 2006 at 07:18:01:

I'm wading into territory I've never been in before (hopping up tractors and pulling), but I HAVE spent years on H's and the tractors in the same 2-plow category that preceded them (IHC 10-20 and F-20). I still like to sit around and think about the old girls, and I do a little armchair engineering from time to time (maybe it will be obvious that I am not an engineer). The older tractors had big engines that ran slowly. Lots of torque, a bit like a big, slow guy with a lot of muscle. They were almost impossible to stop, even if way overloaded. When I first got to do the same kind of work with H's, I was terribly disappointed in the lack of torque (my father first got a low-compression H, which we ran on gasoline, then later he got a "high-compression" gasoline model; there wasn't a lot of difference in the way they performed). It helps to compare the size of the engines: the H has about 152 cubes, if I remember rightly, and the F-20, about 221 cubic inches. The H gets its horsepower from running the engine quite a bit faster than the F-20 (1650 at full load, versus 1200 for the F-20).
The F-20 on 36" rubber (low compression kerosene/distillate engine, but running on gasoline) would pull 2-14s in fourth gear at close to 5 mph, heavily overloaded and with the engine pulled way down, but it wouldn't actually die. The two H's I used over a good 15 years would pull a 2-bottom plow in sod ONLY in second gear, and if you tried to shift up even one gear, you would pull the engine speed way down and it would just stall out. Different design philosophy. No question that the H was a "sweeter" tractor than the F-20--lots more comfortable, lighter, more agile, but it just didn't have the moxie of the older tractor and its big, muscular engine. Well, this is just some fun musing over the good (?) ole days, and I hope it's at least interesting, if not really helpful.

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