You are right about the vacuum reducing the efficiency of a gasoline engine over a diesel. They used to have contests where guys would compete to see which car and driver could get the best miles per gallon of gas. This was a long time ago but even with older cars they were getting fantastic mileage!. One of the tricks that they used, was to hold the throttle wide open till they got up to speed and then they would shut the engine off and coast. They would do that over and over. That would let the engine be just as efficient as a diesel except for the higher heat value of the diesel fuel. You could never drive like that on the highways but I thought it was interesting.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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