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Positive Displacement
Superchargers |
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The most common Positive Displacement
Supercharger is the "Roots" Supercharger and is used by most factory
setups. These superchargers generally provide a flat torque curve boost
throughout the RPM range but are generally less efficient and thus produce
less peak power. A Roots Supercharger has two rotating, intermeshing lobes
that pump air simply by trapping it on one side of the supercharger
between the lobes and the supercharger housing and moving it to the other
side of the supercharger. The main advantage of a Roots Supercharger is
that there is immediate and proportional response to the throttle, because
the blower is always spinning and its pumping ability increases
proportionately and linearly with engine speed. Therefore, a Roots
Supercharger makes the most low RPM power of any Forced Induction system.
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