CC57 Posted April 30, 2010 Report Share Posted April 30, 2010 For those Truck racers running the crate motors, if you run an alternator, what size pulley are you running on the alternator? Thanks Link to comment Share on other sites More sharing options...
Truck99 Posted May 1, 2010 Report Share Posted May 1, 2010 It depends on the size of the drive pulley - the ratio between the two is the important factor in the end. Link to comment Share on other sites More sharing options...
xcellracing Posted May 1, 2010 Report Share Posted May 1, 2010 Crew chiefs always so technical......Its about this big ( ) scale: 1.23mm=1.55" Hope this helps. Link to comment Share on other sites More sharing options...
Truck99 Posted May 1, 2010 Report Share Posted May 1, 2010 Crew chiefs always so technical......Its about this big ( ) scale: 1.23mm=1.55" Hope this helps. yeah, exactly what he said! LOL Link to comment Share on other sites More sharing options...
CC57 Posted May 1, 2010 Author Report Share Posted May 1, 2010 SS99, Good point. What ratio are y'all - or most - running? I would assume les than 1-to-1? Xcell, Helps? Uh, no, not much Link to comment Share on other sites More sharing options...
Truck99 Posted May 1, 2010 Report Share Posted May 1, 2010 We don't run one, but we have in the past. If you are driving it off of a normal size crank or WP pulley, go with the larger alt pulley - I think they are about 4". Link to comment Share on other sites More sharing options...
mikeg Posted May 1, 2010 Report Share Posted May 1, 2010 We went to a 5" and had no more problems. Otherwise at 7500 RPM the alt would come apart, even the racing alt. After the 5" no more problems. Link to comment Share on other sites More sharing options...
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