Engine efficiency refers to the ability of the engine to convert the energy available from the fuel into kinetic energy which is handy. Modern gasoline engine operates at an average of about 20 to 30 percent efficiency.
At no time is running, the engine’s efficiency is zero because the engine does not drive the vehicle and only operate accessories, such as water pumps and generators.
See also: diesel cars
Compared to gasoline engines, diesel engines are considered more efficient. The diesel engine uses high compression in the cylinders to ignite the fuel.
This makes the higher-compression diesel engine has an efficiency of about 40 percent. This efficiency is usually only achieved by direct injection type diesel engine.
The compression ratio of the engine will also affect the efficiency of the engine. This is due, in part, due to the engine’s ability to convert heat from the combustion process to produce energy.
The higher the compression ratio, the better the overall engine efficiency.
The amount of oxygen that can be absorbed machines affect its ability to operate more efficiently.
This is the reason why nitrous oxide added to the fuel system of gasoline engines.
Nitrous oxide added molecular oxygen into the combustion chamber, so that more fuel is burned. This in turn makes the engine operate more efficiently.
The type of fuel also affects efficiency. Gasoline with higher octane will allow the engine to operate with a higher compression ratio, which means increased efficiency.
Fuels such as nitromethane produces oxygen, thereby creating greater engine power due to more fuel is burned.
Another type of machine even has a smaller efficiency. Steam piston engines, for example, operates at about 8 percent efficiency.
Steam turbine on the other hand, operates at a level of efficiency equal or exceed diesel engines.
This is why the steam turbines used for power generation.
While the gas turbine engine is the most efficient of all types of machines when operated at full power.