Gasoline engines type is gas engines are known as internal combustion engines and are divided into two general classes, specifically two cycle and four cycle engines. A cycle of an engine represents one stroke of the piston or one half revolution of the crank shaft, as a complete revolution represents two cycles. With a two cycle engine, the power impulse occurs at each revolution, while with four cycle engines it occurs at every
other revolution, hence the terms two and four cycle engines.

Both classes have their own specific advantages and uses. For autombiles, the four cycle engines is most used. For motor boats on the other hand, the two cycle engine is most often used.

The horse power of gas engines is designated as HP and also brake test HP. The IHP is the theoretical HP, which is found by figuring different formulas, in which the diameter of the bore, length of the stroke in inches, and number of revolutions per minute form the basis for calculation. The results are found by the use of such formulas.

The BTHP on the other hand, is the power the engine actually develops in service, and is considerably less than the IHP. Keep in mind, this depends upon the degree of the mechanical perfection attained in the construction of the same. If both the compression and construction are good, the engine may actually reach 80 - 88% of the intended IHP.

With gasoline engines, high HP and high RPM ranges are what makes them popular. Gas engines have always been more popular than diesel vehicles, for the simple fact that they can achieve more speed. If speed is what you are after, gasoline vehicles are what you should be looking for. Although they may lack in torque and raw power, they make up for it with speed and tuning options.

Why you should choose diesel enggine type ? The major distinction between diesel and gas lies in the type of ignition. While gas engines operate onspark ignition, diesel engines employ compression ignition for igniting the fuel. With compression, the air is drawn into the engine and subjected to high compression that heats it up. The result is a very high temperature in the engine, much high than that of gas engines.

In diesel engines, air and fuel are both infused into the engine at different stages, as opposed to gas where a mixture of air and gas are introduced. The fuel is injected into the diesel using an injector where in a gas engine, a carburetor is used for this very purpose.

With gas engines, fuel and air are sent into the engine at the same time, then compressed. The air and fuel mixture will limit fuel compression, and thereby hence the overall efficiency. Diesel engines only compress air, and the resulting ratio can be much higher.

Advantages
Diesel engines are much more efficient and preferable as compared to gas engines due to the following reasons:
1. Diesel engines have overcome the several disadvantages of earlier models that featured higher noise and maintenance costs. Now, they are quiet and require less regular maintenance when compared with gas engines of a similar size.
2. Diesel engines are more rugged and reliable.
3. There is no sparking at all as the fuel ignites. The absence of spark plubs or spark wires also helps to lower maintenance cost.
4. The fuel cost produced is 30 - 50 percent lower than gas engine fuel prices.
5. Gas burns hotter than diesel, and therefore they have a shorter life span when they are compared with diesel engines.

So hopefully there are benefits.

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