I think that diesels run cooler for the following reasons (in order): 1. The engine provides high torque at low rpm, which means you can run the engine slower with a taller gear, which means that less fuel is consumed, i.e. less energy expended per time. 2. Slower engine means less total mechanical friction. A DI system is more expensive because the pressure required to squirt fuel into the combustion chamber is 50 to 100 times higher than with PI, and the higher-pressure pump imposes parasitic losses First, though, we have to take a look at an engine's basic functions. An engine works by igniting fuel in two ways: heat and compression. Spark-ignition engines are found in most gasoline cars. In these types of engines, the spark plugs fire to ignite fuel in the combustion chamber, while the fuel and air mixture is also being compressed. Density. The kerosene vs. diesel density discussion reveals the latter to be denser. Its density ranges from 0.85g/cm3 to 0.96g/cm3 at 59 degrees Fahrenheit. At the same temperature, kerosene’s density shifts between 0.789/cm3 and 0.81g/cm3. Diesel, with a high density, is prone to gelling when temperatures drop. The Diesel Engine. The diesel internal combustion engine differs from the gasoline powered Otto cycle by using a higher compression of the fuel to ignite the fuel rather than using a spark plug ("compression ignition" rather than "spark ignition"). In the diesel engine, air is compressed adiabatically with a compression ratio typically between The science behind gasoline. Everything you need to know about gas. Combustion, Octane, engines and more. How do different octane ratings affect your engi In other words, for every 6.5 to 7.5 miles, a gasoline-powered vehicle travels on a gallon of fuel, a diesel powered engine will travel 10. And the amount of CO2 produced by the diesel engine is only 2.5 percent greater. A diesel engine produces 30 percent more work and only produces 2.5 percent more CO2 for that gain. Still a Fossil Fuel, However The cost differential for a larger diesel pickup is $8,000 to $11,000 — though a smaller diesel in a ½-ton pickup can be far less. The latest big-block gasoline V-8 is Ford’s 7.3-liter model, introduced last year as an alternative to the Power Stroke diesel. Like other gasoline engines, the 7.3 can be had with hardened valves so it can be Myth #3: Diesel cars don’t perform well. Because diesel engines are still most common in trucks, many people assume that diesel-powered cars would behave like a truck behaves: slow and sluggish. “ But keep in mind, that truck’s likely hauling around 50 tons,” Ciatti said. “ In fact, to some degree, some people who drive diesels find dykk.

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