What is the difference between twin-screw and roots blower?

A twin screw appears similar to a roots style blower, but the differeneces are in the rotor designs. A roots has two equal style rotors that do not compress, instead they just draw in air. A Twin Screw's rotors, or "screws", mesh together and draw air from the back of the supercharger. The twin screw does not use equal style rotors, instead two different screw type "male" and "female" rotors. The twisting of these rotors move the air to the front of the supercharger, while compressing the air before discharging through a port at or near the front of the supercharger. Because the compression is done inside the supercharger, this design produces less heat than a roots supercharger.

That's pretty much the basics. If you want more detail I'm sure you can find it online somewhere or send me a pm.

Couple visuals for you:

Roots:


Twin Screw:


How a twin screw compresses:

The roots supercharger, like the stock Eaton, features two counter-rotating lobes that trap air from the intake side of the supercharger, move it around the outside casing of the lobes, and out the bottom of the supercharger through an outlet / discharge port. Acouple reasons why people like to get ridof the Eaton for a Twin Screw(KB, Whipple) is that the roots supercharger creates a lot of heat. There are two reasons for this. First, the roots supercharger does not compress air, it only moves from the intake port to the discharge port. And secondly, roots superchargers create higher amounts of heat is because they tend to carry some of the compressed air in the intake back into the supercharger because it gets trapped by the rotating lobes that are exposed to the hotter air in the intake manifold.A twin screw appears similar to a roots style blower, but the differeneces are in the rotor designs. A roots has two equal style rotors that do not compress, instead they just draw in air. A Twin Screw's rotors, or "screws", mesh together and draw air from the back of the supercharger. The twin screw does not use equal style rotors, instead two different screw type "male" and "female" rotors. The twisting of these rotors move the air to the front of the supercharger, while compressing the air before discharging through a port at or near the front of the supercharger. Because the compression is done inside the supercharger, this design produces less heat than a roots supercharger.That's pretty much the basics. If you want more detail I'm sure you can find it online somewhere or send me a pm.Couple visuals for you:Roots:Twin Screw:How a twin screw compresses:

Goto Benyuan to know more.

There are many relatively simple ways to add horsepower to your car's engine, such as installing a better intake, reprogramming the Electronic Control Unit, or swapping in a freer-flowing exhaust system. However, there's only so much these tweaks can do. If you have a serious need for speed, then forced induction via a turbocharger or supercharger is the way to go. These can add 100 or more horsepower to your engine, making even the most average engine a lot more fun to drive.

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Each has pros and cons, but we're not here to wade into the supercharger versus turbocharger debate. Instead, we're here to help those of you who've decided on a supercharger to figure out the next step and choose between one of the three supercharger types available: twin screw, Roots, and centrifugal superchargers. They all do the same thing &#; help your engine make more power &#; but each works slightly differently, offering advantages and disadvantages you'll want to be aware of before committing.

Of course, if you have a lot of time and money on your hands, you could just try each type and see which works best for you and your engine &#; but we're guessing that most of you aren't quite that lucky. So, to help you out, here's a quick rundown and comparison of all three supercharger types.

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