![]() ![]() ![]() Gasoline engines are sometimes referred to as “spark-ignition” engines, as opposed to diesels, which are “compression-ignition” engines. Why are diesels so much more thermally efficient than their petrol-fueled counterparts? The answer lies in the differences between how diesels and gasoline engines operate. For biodiesel at a 20 per cent blend, diesel still beats petrol, packing 109 per cent of petrol’s energy. One gallon of low-sulphur diesel fuel has 113 per cent of the energy of one gallon of gasoline. This very fact probably explains why, according to a UK survey, 50 per cent of the cars sold in the European Union are diesel-powered: Fuel prices are extremely high in the EU compared the US. This of course equates to overall engine efficiency. Of all the commonly used engines available today, the diesel has the highest thermal efficiency, meaning its ability to extract energy from its fuel. ![]() The Yanmar 6LY 400/440 is a modern turbocharged marine diesel in the company’s Powerboat Engines series. ![]()
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