Quote:
Originally Posted by ryude
Roots is a pump, it draws the air through the inlet, the air heats up against the casing causing heat\turbulence. Cheap to build, easy to tune, and tends to be more efficient at lower boost levels.
Twin Screw is a compressor, it draws the air through the inlet and compresses the air within the screws. Less heat\turbulence, more expensive, better at higher boost levels.
Twin screw has less parasitic loss compared to a Roots, but you're talking 5-10 HP in our power range.
OEM's use roots style because they are reliable and cheap.
TS are used in lots of after market and racing applications. |
Sorry man you're not exactly right, both are positive displacement pumps and operate on the same principles. Any difference would be attributed to mechanical friction, assuming good sealing.