What is the diff b/t types of superchargers
06-01-2004, 03:56 PM
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What is the diff b/t types of superchargers
what is the main differences between the superchargers: root/screw/centrifugal and is one better than the other or should u just screw the sc and go turbo please help
06-01-2004, 04:33 PM
#2
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RE: What is the diff b/t types of superchargers
Hmmmm, how can I answer this without an essay?
Roots style: positive displacement (without going into a bunch of detail, positive displacement means it moves alotta air at low rpm speeds - means lotsa boost real fast). They generate alotta heat though. The 03 Cobra has a Roots style supercharger.
Screw style: as in Twin Screw style. Its a positive displacement also and it looks nearly identical to the roots, but it uses two impellers that compress the air, instead of just moving the air around like the roots does. They don't get as hot as the Roots either. They can actually produce more boost down low than a Roots, but they also suck up more power to run at cruising speeds because its always trying to compress the air.
Centrifugal: is what you see on most modded cars - mounts like an alternator instead of on top of the intake. It is NOT a positive displacement - which means it puts out different boost amounts per RPM. They also don't suck up nearly the power of the other two types of superchargers or get nearly as hot. The only real drawback is that it takes alotta of speed to start producing boost. On a 10 lb centrifugal supercharger, you may only see 2 lbs of boost at 3k rpm - where as with the other two you can usually see full boost already. On the plus side they are more efficient - meaning they will produce more power up top than the others will.
Turbo: Think of a turbo as a centrifugal supercharger driven by exhaust gas instead of a crank driven belt. Basically all the advantages and disadvantages of a centrifugal supercharger except that a Turbo has 1 up on it - it doesn't take hardly any power to run it (no power from the crank needed to spin it. A turbo is gonna produce boost in a similar fashion, but at a much faster and larger amount of horsepower. A turbo will always produce more power than a supercharger because it does't need a crank driven belt dragging down power to run it. But, its a much more complicated and more costly system.
So there you go. If you want a stump puller - get a twin screw. If you want massive torque and a hellacious bottom end - get a roots. If you want maximum acceleration at the drag strip - go with a centrifugal supercharger, or if you have the big $$$ get a turbo.
Man I don't wanna ever type all this crap again, hehe. Hope this helps.
Roots style: positive displacement (without going into a bunch of detail, positive displacement means it moves alotta air at low rpm speeds - means lotsa boost real fast). They generate alotta heat though. The 03 Cobra has a Roots style supercharger.
Screw style: as in Twin Screw style. Its a positive displacement also and it looks nearly identical to the roots, but it uses two impellers that compress the air, instead of just moving the air around like the roots does. They don't get as hot as the Roots either. They can actually produce more boost down low than a Roots, but they also suck up more power to run at cruising speeds because its always trying to compress the air.
Centrifugal: is what you see on most modded cars - mounts like an alternator instead of on top of the intake. It is NOT a positive displacement - which means it puts out different boost amounts per RPM. They also don't suck up nearly the power of the other two types of superchargers or get nearly as hot. The only real drawback is that it takes alotta of speed to start producing boost. On a 10 lb centrifugal supercharger, you may only see 2 lbs of boost at 3k rpm - where as with the other two you can usually see full boost already. On the plus side they are more efficient - meaning they will produce more power up top than the others will.
Turbo: Think of a turbo as a centrifugal supercharger driven by exhaust gas instead of a crank driven belt. Basically all the advantages and disadvantages of a centrifugal supercharger except that a Turbo has 1 up on it - it doesn't take hardly any power to run it (no power from the crank needed to spin it. A turbo is gonna produce boost in a similar fashion, but at a much faster and larger amount of horsepower. A turbo will always produce more power than a supercharger because it does't need a crank driven belt dragging down power to run it. But, its a much more complicated and more costly system.
So there you go. If you want a stump puller - get a twin screw. If you want massive torque and a hellacious bottom end - get a roots. If you want maximum acceleration at the drag strip - go with a centrifugal supercharger, or if you have the big $$$ get a turbo.
Man I don't wanna ever type all this crap again, hehe. Hope this helps.
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