Pulley Size- Mathematical Question

From: Henry Delchi (hddakota1993@yahoo.com)
Date: Mon May 31 2004 - 22:21:28 EDT

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Hello all,

I have a mathematical question for the mathematicians
(or someone just good at math)

If a 5.5" crank pulley is turning at 1100 RPM's, how
many RPM's would the 2.5" alternator pulley be
turning?

What diameter would the alternator pulley have to be
to keep it spinning at the same speed figured above
but with a reduced crank pulley speed of 700 RPM's?

Please also provide the formula used to figure this
out.

Thanks!
Henry Davis

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