Supercharger Information

There are three main categories of superchargers for automotive use:

– Centrifugal turbochargers – driven from exhaust gases.
– Centrifugal superchargers – driven directly by the engine via a belt-drive.
– Positive displacement pumps – such as the Roots, Twin Screw (Lysholm), and TVS (Eaton) blowers.
Roots blowers tend to be 40–50% efficient at high boost levels. Centrifugal superchargers are 70–85% efficient. Lysholm-style blowers can be nearly as efficient as their centrifugal counterparts over a narrow range of load/speed/boost, for which the system must be specifically designed.

Positive-displacement superchargers may absorb as much as a third of the total crankshaft power of the engine, and, in many applications, are less efficient than turbochargers. Desirable in applications for which engine response and power are more important than any other consideration.

CFM of Blower
60 deg std – Cu in/rev = rotor length X 27.45
High-helix – Cu in/rev = rotor length X 31.53

Opening Top:
15.06″ x 4.43″ W (Buzzard and barn door) 14-71 (older)
12.25 x 4.00″ W (bird and bug catcher) 6 to 10-71 (original)
11.875 ” x 4.50″
10.875 ” ( new style retro/setback etc)
10.50″ Top Fuel
10,00″ Top Fuel (max – 2019)
9.875 ” ( new style retro/setback etc)
9.500″
9,00
8.875″
10.00″
8,00″
7,00″
6,00″

Standard Blower Output – Cu. In. per Revolution (5.840″ represents modern designs)