I know these exist in a few places. What I want to know is, when they're turned off, are they a meaningful restriction? Do you need some way to circumvent them or can the motor breath right through the blower? I'm thinking centrifugal.
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Aug. 23, 2010 1:47 p.m. belteshazzar SuperDork
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Aug. 23, 2010 1:50 p.m. 4cylndrfury SuperDork
my only thought is the air running thru the impeller tines will try to force the unclutched pulley to spin backwards...may not be fun for some or all moving parts if theyre not designed to ...ahem...go both ways (Im thinking of the reducer gearing etc)
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Aug. 23, 2010 5:17 p.m. zipty842 Reader
the supercharger on my mr2 spins the proper direction when the clutch is disengaged. i have not done any testing though to see if there is a restriction. wouldn't matter much on my autocross car anyway.
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Aug. 23, 2010 5:19 p.m. belteshazzar SuperDork
but when it's not engaged, it doesn't have to bypass the blower in order to breath?
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Aug. 23, 2010 5:26 p.m. turboswede SuperDork
Nope. At least not at low engine speeds. At higher RPM, it would become a restriction, even if it freewheeled a bit.
If you're thinking of replicating the Mad Max solution, you'd need a clutch driven blower coupled with an intake bypass solution. Maybe one of those electrically operated exhaust cut-outs?
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Aug. 23, 2010 5:52 p.m. zipty842 Reader
i should add that toyota did have a bypass valve, but i have never had it installed either.
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Aug. 23, 2010 7:34 p.m. Jensenman SuperDork
I believe the Mercedes version on the 1.8 Kompressors freewheels when the clutch is disengaged. But that's a Roots type blower, not a centrifugal.
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Aug. 23, 2010 8:50 p.m. Appleseed SuperDork
Judging by your avatar, you've been watching Mad Max again.
