The major difference between a diesel engine and gas engine are truly quite easy. The gas engine takes a mix of fuel and air and compresses it then ignites it with a spark. A diesel engine takes in just air, compresses it, then injects fuel into the compressed air and the heat from the compressed air ignites the fuel.

Gas engine sometimes use carburetion or port fuel injection. In carburetion the air fuel mix is accomplished before it ever reaches the cylinder. In port injection the fuel is injected just before the power stroke. It isn't injected into the cylinder. It is injected into the air blend outside of the cylinder. A diesel engine however uses direct fuel injection. What this suggests is that the fuel is injected right into the cylinder on the compression stroke of the cylinder.

Diesel engines cost more when first acquired than does the equivalent size gas motor. A diesel engine is rather more lethargic and less respondent in some instances while a gas engine will reply faster.

The gas engine will be dearer to operate in the long term as far as repairing and maintenance and will wear out long before a correctly maintained diesel engine.

In an auto or light truck the fuel potency of a diesel will be rather better making your decision slightly of an environmental choice. Either engine has its issues and endowments and neither is better than the other. It reduces down to private preference and availability. The sole exception being in circumstances like enormous trucks, locomotives and anything which has to perform a heavy load for long periods then the diesel is the engine of preference.