Posted: Mon Dec 21, 2009 9:28 pm
Chunk,
Sorry for not being Johnny on the spot with an answer for you. I still work a day job! You got your answer already. It's very simple geometry and math. The generator pulley will turn the alternator faster than it needs to. I never said your rig wouldn't work but your alternator will last a lot longer if you run the slower pulley. Saves on bearing wear. Electrically speaking it can be a problem in more modern engines where RPMs run much higher than these old flatties turn to. Does this clear it up for you?
Sorry for not being Johnny on the spot with an answer for you. I still work a day job! You got your answer already. It's very simple geometry and math. The generator pulley will turn the alternator faster than it needs to. I never said your rig wouldn't work but your alternator will last a lot longer if you run the slower pulley. Saves on bearing wear. Electrically speaking it can be a problem in more modern engines where RPMs run much higher than these old flatties turn to. Does this clear it up for you?