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Illustrated: Bolt-on Supercharger
Illustrated: Bolt-on Supercharger
Supercharging: The motor’s four-stroke cycle first allows the pistons to draw air in through the Carburetor, the intake manifold and the intake valves. The air is then compressed by the piston while all the valves are closed and ignited by the spark plug. The resulting explosion forces the piston down in the power stroke. The final stage of the four-stroke cycle is when the piston comes back up and forces the spent gases out of the exhaust valve. To better understand this process see also How Does An Engine Work.


Supercharging
Supercharging Kit
In theory, a denser air charge (also mixed with fuel) will create a more powerful combustion explosion inside the cylinder, thus creating more down force on the piston which translates into horsepower. Increasing this air charge is where the supercharger comes in. The mechanically driven supercharger force-feeds the combustion chamber a denser air/fuel mixture. This mechanically increases the compression ratio by forcing a boosted (pressurized) air/fuel mixture in the combustion chamber. The denser charge will increase dynamic cylinder pressure upon ignition to create more power.

Mechanically driven superchargers can be classified into two distinct types: basic air pumps and true compressors.

Roots blowers have a two- or three-lobe rotor design, depending on the size of the case. They can move mass quantities of air which stacks up inside the intake manifold to create positive pressure, or boost, they have higher discharge temperatures than other designs.

As with everything in life, nothing is free. All belt-driven superchargers need horsepower to run--sometimes as much as 20 percent of engine’s total. The good news is that the additional horsepower created by the blower will more than make up for power loss.
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