I can pick up that regulator for under $100, and if the alternator isn't producing more than 90 amps it should work safely. It has a slow start feature to limit the belt slip. If that doesn't work I'll add in a rheostat downstream of the reg to slowly ramp up the current myself.
I can't find any info about alternator output, so i'll just have to go with something. It's for a Dodge Ram 5.9 which has a 7.25" crank pulley. Probably idles around 750rpm and highway speeds at 2000rpm. 3.64:1 ratio (alt pulley is 2") so that's 2730-7280rpm at the alternator.
Most power curves for alternators look like this:
So finding that spot where it produces 90amps is going to be tough. I'm thinking it'll be somewhere between 3000-4000 RPM or a 3-4" pulley. Anyone have a source for pulleys with a 35-36mm bore?
Edit: trying to keep this on the cheap side I may buy/salvage this idler pulley: http://www.summitracing.com/parts/dac-89057/overview/ 90MM pulley = 3.5 inches. The bearing is probably a 6203 so if i can pull it i'll be left with a ~ 40mm bore. Looks like they come on Ford 7.3 Powerstrokes.
I can't find any info about alternator output, so i'll just have to go with something. It's for a Dodge Ram 5.9 which has a 7.25" crank pulley. Probably idles around 750rpm and highway speeds at 2000rpm. 3.64:1 ratio (alt pulley is 2") so that's 2730-7280rpm at the alternator.
Most power curves for alternators look like this:
So finding that spot where it produces 90amps is going to be tough. I'm thinking it'll be somewhere between 3000-4000 RPM or a 3-4" pulley. Anyone have a source for pulleys with a 35-36mm bore?
Edit: trying to keep this on the cheap side I may buy/salvage this idler pulley: http://www.summitracing.com/parts/dac-89057/overview/ 90MM pulley = 3.5 inches. The bearing is probably a 6203 so if i can pull it i'll be left with a ~ 40mm bore. Looks like they come on Ford 7.3 Powerstrokes.