Diesel Versus Spark Engine Ignition As you may already be aware of, diesel engines are more efficient than gasoline engines of the same power, resulting in much lower fuel usage. For an efficient turbo diesel, the average is 40% more miles per gallon. The higher compression ratio with diesel engines help to raise efficiency, but diesel fuel also contains around 15% more energy per unit volume than gas. Diesel engines that are naturally aspirated are far more massive than gasoline engines of the same power for two reasons. First, it takes a larger capacity diesel engine than a gas engine to produce the same amount of power. Essentially, this is because the diesel can’t operate as quickly. The rev limit is slower, because getting the correct fuel to air ratio into a diesel engine fast enough is more difficult than a gas engine. The second reason is due to the fact that a diesel engine needs to be stronger to
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