Originally Posted by abelungu
Reboring is not a good idea, if it's cast. If its stock? why be messing around have one made. Oversize a little so it run faster. Alternators burn because of not enough ventilation most of the time. Leave room for the best fan you can get on there.
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We can rebore using a lathe. It is aluminum
(I think 6013 but it may be 6061) so cutting it will not be a problem. I would like to get the company that makes the one with the smaller bore to make one for me from rod. The small bore one also has a deep recess because some of the small alternators have a shorter shafts than the heavy duty ones. The Delco 28SI has a long enough shaft that the pulley can be 1.5" thick without having to cut a recess for the nut. It will be early next week before a decision is made.
This pulley is on the alternator
so I think you intended to say smaller rather than oversize to increase the alternator rpm
. I am reducing the diameter some. The thing that concerns me is belt wrap. I have about 120 degrees. I haven't found a chart yet that shows how much I need for:
Dual 1/2" belts with 120 degree wrap. I would like to use 2.5 inch alternator pulley. Anybody know if the 2.5" will spin this alternator without belt slip?
160 amp alternator should need about 6.5 horse power and I don't know how much torque.