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To increase mass of air delivered to each cylinder (by increasing air pressure). More air means more fuel can be injected into each cylinder hence producing more power for given engine size and as a by product it also improves efficiency.

Inter-coolers provide further power increase by reducing air temperature and once again increases mass. Fuel efficiency goes up again as does power to weight/cost ratios.

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Q: Why is a turbocharger used on a diesel engine?
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Related questions

How much horsepower does a turbocharger use from a diesel engine?

depends on the engine size


What spins the turbocharger on a diesel engine?

The flow of exhaust gasses


How does one use a turbocharger?

A turbocharger is usually found in race cars and automobiles that have a diesel engine. The point of a turbocharger is to give said automobile a significant amount of extra power to the engine's horsepower.


Will any turbo fit on a diesel?

No, a turbocharger must be appropriately sized for the engine.


Which cars can use turbo diesel?

Cars that are capable of using turbo diesel are any cars with an engine that is equipped with a turbocharger. The turbocharger produces higher power output, lower emission levels, and improves the overall efficiency from a similar style of engine.


Is it possible to fit a supercharger and a turbocharger on the same engine?

Yes, this was done on diesel engines for a while.


Why supercharger are not used in ci engine?

now a days superchargers are replaced by the turbocharger. supercharger is taking drive from engine while turbocharger taking drive from exhaust gases.


Why diesel vehicles have turbocharged engines?

In order to use less gas, the size of the engine is reduced, but it also reduces its power. A turbocharger is then added to increase the power of the engine.


What type of engine does a Dodge Cummins have?

The Dodge pickup trucks with Cummins engines are diesel turbocharger engines. They are built by the Cummins company and have been used in Dodge Ram trucks since 1989.


Why is oil coming out exhaust from diesel engine on a tractor?

Most likely, the turbocharger is toast. I hope you have some butter handy to help you eat it.


Why a turbocharger is not used in a petrol engine?

They certainly are. Using them together with carburetted engines can be a bit tricky, and usually the compression has to be lowered when compared to a naturally aspirated engine.


What happens if petrol is used in diesel engine and vice versa?

If gasoline is used in a diesel it will damage the engine. If diesel is used in a gasoline engine it will do no real damage as the engine will not run.