Re: new alternator for our old cars?
This is the info I found out having lengthy discussions with manufactures and prominent rebuild shops when I needed to upgrade mine.
The common issue with small case (older) alternators is they can have trouble with heat when pushed over 100amps. Not all do, just more likely. The small case unit I got from jegs with 120amps lasted just over a year. As well, these pumped up units tend to have trouble charging at lower rpms. With an oversized pulley you can even have trouble charging at cruise speeds.
The issue with newer larger case units is the size. They are about 1/2 different on the bolt hole. Usually causes alignment issues and belt tossing. Why someone has not come out with a bracket with this in mind I don't know. If someone wants to take that idea and run with it....Please do.
Any of them can be converted to single wire setup. Just some cases are harder to switch out the unit than others. Alternators are easy to clock so that really isn't an issue.
I use a 140 amp large case alternator from a 94 cady that I converted to single wire. And yes had belt tossing issues above 6k rpm. I now use a smog pump bracket from an 85 chevy pickup to mount it low on the passenger side by the fuel pump. I can wind it up over 7k with no problem. Granted mine is a small block setup, so not sure for big block, but the lower radiator hose from the same year truck also has to be used.
Wheres that money tree hiding and who forgot to water it?