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Message: <blockquote data-quote="synchron" data-source="post: 694952" data-attributes="member: 115">Here is the answer to your question1)In order for a centrifugal to pump efficiently, it has to spin very very fast and that is why step up gearboxes are for right? YES2)Do roots use step up gearboxes too?NO3)But why do centrifugals have to rev up high to pump efficiently?Centrifugal s/c needs to certain amount of s/c RPM to make boost. It pump efficiently from low and high RPM as long as it does not rev over it's max supercharger speed.4)do roots have to do so too?NO, because they are pumping alot of air from the start and when the RPM get higher it begins to generate heat, so it looses a good amount of cool air. Presure of a roots charger is generated in manifold ( that is why the boost remains the same in high RPM) where the centrifugal s/c generate it pressure in the compressor housing. 5)and if your centrigual s/c unit supports up to 110000 rpm as stated earlier, tht means your s/c can still pump air at 10,000 rpm engine speed and wont have to worry bout your s/c overspeeding and getting choked where the air enters the speed of sound and stops moving? YES, it can pump air into the engine at high rpm. The other part is that revving more than the s/c speed is also determine from the ratio of the crank pulley and the s/c pulley.6)are reversions are bad thing for supercharged engines?If you mean back flow, then the answer is yes. It will spoil the charger. 7)are high cams lucrative on supercharged engines? i just know it isnt for turbocharged.Supercharger are in a different from turbocharger. The more power the engine generate the more powerful are supercharger. They are belt driven by the engine speed. You can actually run high comp piston on a s/c but the only set back is that you will need alot of fuel.Smaller CC engine work very well with the centrifugal s/c while the roots or screw type works well with bigger CC engine. If you want to go for roots chargers might as well go for screw chargers, screw charger are more responsive, can boost more , able to go at a higher RPM. The reasons that i choose centrifugal s/c is that they are much cheaper, able to reach a high rpm for the engine, less stress to the engine, easier installation, does not need to use intercooler. Especially the newer centrifugal s/c because they can spin faster than a turbo because of the high step-up ratio.</blockquote>

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