Turbo Chargers
Newer diesel
engines have turbo chargers to increase their horsepower and
make them run more efficiently. The idea involves taking
exhaust, compressing it in a turbo, and injecting it back into
the combustion chamber (Nice, 2000). Diesels run on an air and
fuel mixture. When there is more air being forced into the
chamber, then there also has to be more fuel or else the
engine will not have combustion. With more fuel and air, there
is more energy
being converted and the fuels are going to be burning more
thoroughly and efficiently.
In a Diesel
engine: Air + Fuel = Power
https://www.dieselnet.com/tech/air_turbocharger.php