Anybody use large dia. pulleys on your alternator? - Moparts Forums

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Anybody use large dia. pulleys on your alternator? #458785 09/03/09 11:44 PM 09/03/09 11:44 PM
Joined: Aug 2006 Posts: 85 Iowa R Rodder OP member
Rodder OP member R Joined: Aug 2006 Posts: 85 Iowa	I have tried tried two different pulleys for racing. One spit off the end of the shaft and went down the track, and the other won't keep the belt on. I gave up on the last one because I could not line it up to keep the belt on no matter what I tried. Do they really give you any performance gain?

Re: Anybody use large dia. pulleys on your alternator? [Re: Rodder] #458786 09/04/09 09:44 AM 09/04/09 09:44 AM
Joined: Oct 2004 Posts: 8,165 Left Coast B BobR master
BobR master B Joined: Oct 2004 Posts: 8,165 Left Coast	Quote: I have tried tried two different pulleys for racing. One spit off the end of the shaft and went down the track, and the other won't keep the belt on. I gave up on the last one because I could not line it up to keep the belt on no matter what I tried. Do they really give you any performance gain? Performance gain? Slight. Sounds like you have some alignment issues.

Re: Anybody use large dia. pulleys on your alternator? [Re: Rodder] #458787 09/04/09 09:55 AM 09/04/09 09:55 AM
Joined: Oct 2007 Posts: 4,213 New York polyspheric master
polyspheric master Joined: Oct 2007 Posts: 4,213 New York	Rather than just slow it down (reduced charging at all speeds), the usual method is to keep the same ratio so it charges at idle, and kill the current to the fields under WOT with a micro-switch and relay so there is no drag during the run except the belt friction. Boffin Emeritus

Re: Anybody use large dia. pulleys on your alternator? [Re: polyspheric] #458788 09/04/09 11:00 AM 09/04/09 11:00 AM
Joined: Oct 2006 Posts: 365 Motor City S Shaker223 enthusiast
Shaker223 enthusiast S Joined: Oct 2006 Posts: 365 Motor City	Take 10 pounds out instead. 11.02 @ 120 mph - Slant 6 & Turbo http://www.youtube.com/watch?v=EAxRmoDgsdY Chassis Dyno http://www.youtube.com/watch?v=wd6hFGzLJMc

Re: Anybody use large dia. pulleys on your alternator? [Re: Rodder] #458789 09/04/09 11:11 AM 09/04/09 11:11 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Moroso sells a 5" deep groove press on pulley. 5461781-DSC00207.JPG (99 downloads) Fastest 300

Re: Anybody use large dia. pulleys on your alternator? [Re: Rodder] #458790 09/04/09 11:15 AM 09/04/09 11:15 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	I make my own pulleys for my stuff and yes I do make the alt pulley larger but not alot due to the groove I put into them... its deeper so it has a lesser chance to throw the belt... I use to have a switch to turn off the field but found it didnt make any difference on my car so when I replaced my switch panel I didnt do that switch

Re: Anybody use large dia. pulleys on your alternator? [Re: Crizila] #458791 09/04/09 12:06 PM 09/04/09 12:06 PM
Joined: Nov 2003 Posts: 378 NW Indiana USA 727specialist enthusiast
727specialist enthusiast Joined: Nov 2003 Posts: 378 NW Indiana USA	Quote: Moroso sells a 5" deep groove press on pulley. I use that same pulley. I kept frying bearings with the high RPMs. I haven't had anymore problems with the bearings since using it.

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