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Message: <blockquote data-quote="-e f i n i-" data-source="post: 693631" data-attributes="member: 7258">Sorry to bring up old topic again, but theres just something that i want to confirm.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? Do roots use step up gearboxes too?But why do centrifugals have to rev up high to pump efficiently? do roots have to do so too?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? are reversions are bad thing for supercharged engines?are high cams lucrative on supercharged engines? i just know it isnt for turbocharged ones.</blockquote>

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