Twin-screw Superchargers
 Twin-screw supercharger |
A twin-screw supercharger operates by pulling air through a pair
of meshing lobes that resemble a set of worm gears. Like the Roots supercharger, the air inside a
twin-screw supercharger is trapped in pockets created by the rotor lobes. But a
twin-screw supercharger compresses the air inside the rotor housing. That's
because the rotors have a conical taper, which means the air pockets decrease
in size as air moves from the fill side to the discharge side. As the air
pockets shrink, the air is squeezed into a smaller space.
This makes twin-screw superchargers more efficient, but they
cost more because the screw-type rotors require more precision in the
manufacturing process. Some types of twin-screw superchargers sit above the
engine like the Roots supercharger. They also make a lot of noise. The
compressed air exiting the discharge outlet creates a whine or whistle that
must be subdued with noise suppression techniques.
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