How Internal Combustion Engines and Superchargers
Actually Work
All naturally aspirated engines are negative or low pressure air pumps
As the piston moves down the bore it reduces the pressure in the cylinder which causes
the higher atmospheric pressure outside the engine to force air into the lower pressure
environment in the engine. Since naturally aspirated engines are not able to increase
atmospheric pressure outside the engine like superchargers, they use high rpm to further
reduce the pressure inside the engine which forces a larger volume of air into the engine.
However, during low rpm the engine is not able to reduce the pressure inside the engine as
much as during high rpm which forces less air into the engine and produces less power.
This is the reason naturally aspirated engines produce less power the lower the rpm and
more power the higher the rpm.
All conventional superchargers and turbochargers are positive or high pressure
air pumps
These devices are auxiliary air pumps which increase atmospheric pressure outside the
engine in order to force a greater volume of air into the lower pressure environment in
the engine. By increasing the speed of the auxiliary air pump without increasing engine
rpm, the air pump further increases the atmospheric pressure outside the engine which
forces even more air into the same low pressure environment in the engine. This is the
reason auxiliary air pumps are able to force a greater volume of air into the engine from
idle and produce substantially more power than naturally aspirated engines.
| Impulse Engine Technology
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Ph: (02) 9398 5544
Fax: (02) 9398 5644
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Fax: +(612) 9398 5644
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Inventor of Negative Pressure Supercharging
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