Roots vs. Twin Screw - Which is King?

This page should show you the benefits of upgrading from a factory Roots style supercharger to a aftermarket Twin Screw supercharger.

(NOTE: Adobe Acrobat is needed to view many of the links)

First, a little information which identifies the physical differences between the two blowers, and what makes the Autorotor far superior! Twin Screw vs. Roots

Also, be sure to check out the Ultimate Comparison Test between the Eaton M90 and the Kenne Bell 1.5L Autorotor on a 4.6L Mustang; the results are out of this world. Any doubters that actually believe that the Twin Screw isn't a worthwhile upgrade MUST READ THIS!

Here is the first of three diagrams showing the "performance" characteristics of the Eaton M90. Displayed is the inlet flow graph, note that it cuts off at 550 CFM, the 1.5L Autorotor flows a WHOPPING 693 CFM, an improvement of over 140 CFM!

This graph shows the parasitic losses of the M90, look closely, that is 45 HORSEPOWER that blower is robbing you of. The 1.5L Autorotor consistantly saves 10-16 horsepower over the Roots!

Outlet temps, this is one of the greatest factors in making safe and reliable horsepower on any vehicle. Lower blower outlet temperatures generally lead to a denser charge that is far less prone to detonation; as we all know, detonation is BAD!

Kenne Bell blowers have shown up to a 35% reduction in outlet temps at high boost levels. Now, THAT is a difference you can feel!