Overdrive alternator pulley question.

[DaveL]

Is it possible to overdrive an alternator too much? Does anyone know what the stock size alternator pulley is as well? I'm thinking of getting a 70mm pulley.

 

[wytstang]

70mm is an underdrive pulley. The over drive pulley is 56mm.

 

[mystang94gt]

Not sure about the stock size but that seems HUGE imo. I think the one on my Alt (u/d one) is like 50mm at the most.

 

[mystang94gt]

70mm is an underdrive pulley. The over drive pulley is 56mm.

Really? Damn I must be tripping. I looked at my ruler and thought 70mm seemed way to big.

 

[wytstang]

Not sure about the stock size but that seems HUGE imo. I think the one on my Alt (u/d one) is like 50mm at the most.

That can't be right. The bigger the pulley the slower it turn hince underdrive. The smaller the pulley the faster it spins hince overdrive.

 

[wytstang]

GO to this link scroll towards the bottom it says underdrive Cobra R pulley 70mm right under they have one for sale as overdrive 56mm http://www.mustangparts.com/engine.htm

 

[mystang94gt]

That can't be right. The bigger the pulley the slower it turn hince underdrive. The smaller the pulley the faster it spins hince overdrive.

Well your right about that. I just couldnt picture a 70mm pullie on my alt. I'm on my way out the door so I will go measure right now. LOL.

 

[DaveL]

GO to this link scroll towards the bottom it says underdrive Cobra R pulley 70mm right under they have one for sale as overdrive 56mm http://www.mustangparts.com/engine.htm

Dang I need glasses cause that's the exact page I was looking at! Thanks.

 

[mackey]

I would never overdrive my alt. I blew up two in one week at New England Dragway. Good thing the one i bought has a lifetime warranty. The first one, just stopped charging (bad diode). The second one had the voltage regulator go, and cooked the battery at 18+ volts and the battery literally exploded acid everywhere.