underdrive pulley help and question
Legend
Joined: Jul 2007
Posts: 7,843
Likes: 13
From: DFW, Texas
Uuhhhhh... I's confuzzled. If, say, the crank pulley is 10% smaller than stock, and the alternator pulley is likewise 10% smaller than stock, then the ratio is the same as stock... and the alternator will whirl around at the same speed as it did when there were stock pulleys in both locations. So, uh, where's the accelerated wear coming from?
Ain't nuthin' wrong with kicking the alternator speed up a few percent, anyway. They'll be able to make more energy at idle, and will run cooler which is very good news for the rectifier diodes.
Ain't nuthin' wrong with kicking the alternator speed up a few percent, anyway. They'll be able to make more energy at idle, and will run cooler which is very good news for the rectifier diodes.
Record Breaker
Joined: Mar 2009
Posts: 1,430
Likes: 2
From: WV
OK I know I am bringing this back up from the dead but I need some help. I don't know if any of you guys remember when I put my under-drive kit on my truck it is a 30% crank, and 25% alt. I have a 120 amp alt on my truck if I idle my truck with the blower on my alt will not keep up. Why? Does anyone have the under-drives on there truck without charging problems? If I put a 250amp alt on with the under-drives will it keep up? Any help would be great.