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 - Engine Basics: Spark Plug Cleaning - by Staff. Cleaning procedures: Brush or blow dirt from around the spark plug base. Remove the plug with a correctly fitted wrench. Examine the porcelain insulator and points. If the insulator appears to be melted or blistered, cracked or broken, and the points seem unduly burned it is evident that the plug is operating too hot and it should be replaced with a colder plug. If the plug is fouled excessively with carbon it apparently is operating too cold and it should be replac
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