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Old 08-08-2004, 05:10 AM   #25
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region: NWIC
Location: portland
1990 Legacy wagon
goes 12.387 @ 116.5


Hey look what I found. I previously said that my supercharger did not have a throttle bypass vavle for when not on boost. It turns out that the clutch works as this. ie, when the clutch is not engaged, the air is just coming though. I was doing this, just didnt know this was the answer.

Here is the quote.

"One disadvantage of this internal compression ratio is higher parasitic losses during off-boost operation. A Roots blower can be bypassed with a simple butterfly valve at part throttle and the only drag will be the mecahnical movement of its gears and lobes (which accounts for only about 0.3 hp according to Eaton). A Lysholm compressor, on the other hand, will continue to compress air as long as it is being turned, even if a bypass valve allows that air to be recirculated. The only way to eliminate a Lysholm compressor's parasitic drag at cruise is to let it stop turning via a clutch. (Ironically, the Eaton Roots blower used by Mercedes-Benz uses a clutch instead of a bypass valve, despite this being the more complicated solution. Mercedes does things its own way.)"
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