This high compression ratio causes increased cylinder pressures of 400 to 600 psi, this in turn increases the air temperature inside the cylinder to such a high degree that it ignites the atomized diesel fuel that is injected. Compression Ratios & Fuel InjectionĬompression ratios in diesel engines can be up to 24:1. In a gasoline engine, the speed of the engine is primarily controlled by the amount of air admitted into the carburetor or fuel injection system.ĭiesel fuel is injected into the cylinder by a fuel injection system, which basically consists of a pump, fuel line, and injector or nozzle. Another difference is, the speed of a diesel engine is controlled by the amount of fuel injected into the cylinders. One difference in a diesel engine is diesel engines compress only the air within the combustion chamber. Combustion of fuel within the engine cylinders is the source of its power. Like the gasoline engine, the diesel engine is an internal combustion engine using either a two or four-stroke cycle. The diesel engine is known as a CI (compression ignition) engine, while the gasoline engine is known as a spark ignition engine.

An engine out of adjustment can cause excessive exhaust smoke, poor fuel economy, heavy carbon buildup within the combustion chambers, and short engine life. The diesel fuel injection system is a major component of a properly operating engine.

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