Direct injection: Diesel engines use direct injection, which means that the fuel is injected directly into the combustion chamber. This allows for a more precise control of the fuel injection process and results in a more efficient combustion process.
Turbocharging: Many diesel engines are turbocharged, which means that they use a turbocharger to compress the air before it enters the combustion chamber. This results in a denser air-fuel mixture and a more efficient combustion process.
Aftercooling: Some diesel engines are also aftercooled, which means that the air is cooled after it leaves the turbocharger. This results in a denser air-fuel mixture and a more efficient combustion process.
Variable geometry turbocharger: Some diesel engines use a variable geometry turbocharger, which means that the vanes of the turbocharger can be adjusted to control the amount of boost pressure. This allows for a more efficient combustion process at different engine speeds and loads.
Common rail injection: Common rail injection is a type of fuel injection system that uses a common pressure rail to supply fuel to the injectors. This allows for a more precise control of the fuel injection process and results in a more efficient combustion process.
As a result of these factors, diesel engines are typically more efficient than 4-stroke gasoline engines.
