Saleen VI Series Maintenance Schedule - page 3
Rotor Clash on Twin-Screw Supercharger
The Saleen Series IV and Series VI superchargers are extremely efficient twin-screw
style superchargers. They are chosen for their excellent power delivery characteristics,
and for their ability to keep air temperature cool and maintain high boost under harsh
operating conditions.
The twin-screw style superchargers feature tightly bound rotors. As a result of the tight
tolerances, the rotors are relatively loose when cold and when the engine is running at
idle. This causes a whirring noise to emanate from the core of the supercharger which is
known as “rotor clash.”
If a twin-screw supercharger is noisy when cold and running at idle speeds, but the noise
subsides as the car (and the supercharger) warms up, and as engine speeds climb into
normal driving speeds, the supercharger may be considered to be operating properly.
All superchargers are carefully examined after being assembled, and are pressure tested
before shipment. The Series VI unit is also subjected to a special test stand where it is run
at high velocity; the noise level from the supercharger is measured and compared to a
pre-determined standard to ensure that all moving parts are properly installed and
working as designed.
An easy field test for a supercharged vehicle is to compare it to an equivalent Saleen
supercharged vehicle.
If you have any questions, please feel free to contact us at
248
-
743
-
4800
.