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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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