Re: dual fuel H

Posted by LenNH on February 18, 2010 at 17:37:27 from (24.60.236.239):

In Reply to: dual fuel H posted by ryanwheelock on February 18, 2010 at 06:10:58:

Can't answer the question about the early options, but I can say that the distillate option was still a strong one in 1939. The F-20 and F-30 and tractors with similar engines continued to be made distillate-only right up to the end, if I have my info right. One thing I can say: I was "active" on IHC tractors from the age of about 8 (1939) until just a few years ago, and in all the years I was around IHC tractors with kerosene/distillate engines (low-compression, hot manifold), I never saw ANYBODY go to the trouble to use kerosene or distillate.
It is a royal pain in the you-know-what. To start, you had to make sure the carb was clear of kerosene by opening the drain, unless you were sure you killed the engine the night before by shutting off all fuel, or shutting off while running on gas; open gas valve; start; warm up good and hot--steam from radiator, or proper indication on temperature gauge available on some tractors; work and keep hot--they didn't work well on light loads and slow engine speeds--you could expect some sputtering; shut off kerosene, turn on gasoline if you preferred to stop with the carb full). Incidentally, those petcocks along the side of the crankcase were meant to be drained down to the lower one every morning if you had used the tractor for any length of time the day before--kerosene or distillate would condense enough to dilute the motor oil--another nuisance to add to the mix.
I guess it's obvious that the low-compression ratio necessary for kerosene or distillate didn't get the most power from gasoline, which can take quite a bit more compression before
detonating. There were lots of aftermarket kits
available for raising the compression on the older tractors, often, I believe, in the form of pistons shaped to increase the compression ratio. IHC, in fact, sold "5000 ft." and "8000 ft." pistons, which were intended for use at those altitudes where the air is thinner. Still, I imagine those pistons were sometimes used for increased power at lower altitudes. I often wonder if they might have given a higher compression ratio than would have been good for the bearings. Anybody out there have experience with such pistons? What were the results in power and in reliability of the engine?

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