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<blockquote data-quote="EricM" data-source="post: 1427323" data-attributes="member: 20286"><p>No- all the Eaton, Whipple and Kenne Bell roots/twins screw blowers I've ever seen have no clutch or one-way gearing whatsoever. I have only seen clutched blowers on a few Mercedes years back.</p><p></p><p>When you shut it down, the blower is not still spinning. If the pulley is not turning, the blower is not turning.</p><p></p><p>I'd bet they ran this sprag style 1 way clutch to protect the crank snout. Imagine it's run up to redline, then you bang an 80 ms shift with that fancy trans- the blower is still at redline RPMs and the crank/belt has to slow down those rotors to the now-lower engine RPMs. Guys who ran the big 3.4L blowers on the 03/04 Cobra were breaking off the crank snout due to the massive shock load to the crank from fast RPM changes during shifts.</p></blockquote><p></p>
[QUOTE="EricM, post: 1427323, member: 20286"] No- all the Eaton, Whipple and Kenne Bell roots/twins screw blowers I've ever seen have no clutch or one-way gearing whatsoever. I have only seen clutched blowers on a few Mercedes years back. When you shut it down, the blower is not still spinning. If the pulley is not turning, the blower is not turning. I'd bet they ran this sprag style 1 way clutch to protect the crank snout. Imagine it's run up to redline, then you bang an 80 ms shift with that fancy trans- the blower is still at redline RPMs and the crank/belt has to slow down those rotors to the now-lower engine RPMs. Guys who ran the big 3.4L blowers on the 03/04 Cobra were breaking off the crank snout due to the massive shock load to the crank from fast RPM changes during shifts. [/QUOTE]
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