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Originally Posted by JiXer  You are confused. I did not measure the radius. The full outer diameter of the SC pulley is 2.97" Rib to rib would measure slightly less. Do you measure in the valley of the rib or at the crest? I'm sure it doesn't matter much, but fo ID purposes between different pulleys, it might mean something? So if I am running the 5.75" crank pulley and a 3" SC pulley, I might be over revving the blower. So for 12 psi and safe revs, I may want to run the 3.4" pulley: http://pulleyboys.com/bmw.html $90 seems pricey for a pulley? J. |
I'm confused I saw middle to edge instead of accross middle to edge. My error. I'm stumped since you have a SC pulley I'm not aware of. If my crank pulley is 6" then you might be ok. I will try a measurement tomorrow so you can calculate my blower rpm and go from there. Sorry about that. Good news is I have the 3.4" and 3.6" pulley's if you want to try them. I could send both and you keep the one you like for half the price of a new one. Both are in excellent condition with less then 100 miles on each
