They WERE needed in tractors sold to be used in high altitudes in order to get them to make near their rated horsepower. At a high altitude, their is less air getting into the combustion chamber and that means less compression and less fuel can be burned. Two good ways to raise it. One is to raise the "mechanical compression ratio" with a high-top piston or smaller chamber in the head. Another method is to raise the "effective compression ratio" by forcing more air into the engine via intercooling and supercharging. A turbo was the common fix (exhaust driven supercharger). Mr. McCulloch of chainsaw fame invented one of them that were popular. Called the "Paxton" which was Robert McCulloch's middle name.
On the subject of higher mechanical compression - Oliver still holds the record for fuel efficiency in a gas tractor with a very high mechanical compression ratio. It's the Oliver 1800 tested in 1960. Gas tractor that was more efficient then many diesel farm tractors. An Allis Chalmers D10 took 2nd place for the record.
The high compressoin Oliver 1800 gas tractor tested more efficient than these diesel tractors e.g. Oliver 1755, IH hydro 186, Massey Ferguson 205, Kubota L185, John Deere 2010, Ford 6000, John Deere 3020,
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
... [Read Article]
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