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 - Tractor Hydraulics - The Basics - by Curtis Von Fange. Hydraulics was one of the greatest inventions for helping man compound the work he can do. It’s amazing how a little floor jack can lift tons and tons of weight with just the flick of a handle. What’s even more amazing is that all the principals of hydraulic theory can be wrapped up in such a small package. This same package applies to any hydraulic system from the largest bulldozer to the oldest and smallest tractor. This short series will take a look at the basic layout of a simple hydraul
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