The amount of power that a used diesel engine can produce is limited by how much fuel it can burn, and the amount of fuel it can burn is limited by the amount of oxygen in the cylinder, which is the amount of oxygen in the cylinder is limited by the amount of air in the cylinder.
Used diesel engine lasts much longer than gasoline engines because gasoline destroys lubrication and diesel fuel does not. Cold start-ups are a real killer for gasoline engines because of extra gasoline required to start a cold engine. Used diesel engines require more frequent routine maintenance than gasoline engines: more oil changes at 3,000 miles and more fuel filter and air filter changes. On the plus side however, routine gasoline engine maintenance--such as replacing spark plugs, a distributor cap, rotor and replacing ignition wires--are not necessary on a diesel engine.
One major difference between a gas engine and a used diesel engine is the injection process. Most car engines use port injection or a carburetor rather than direct injection. In a car engine, all fuel is loaded into the cylinder during the intake stroke and then compressed. The compression of the fuel/air mixture limits the compression ratio of the engine. If it compresses the air too much, the fuel/air mixture spontaneously ignites and causes knocking. A diesel compresses only air, so the compression ratio can be much higher. The higher the compression ratio, the more power is generated. For more information about used diesel engines, visit Depco's website.
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