<VV> 100 Amp Alternator Option

[jvhroberts at aol.com]

 10SI and 10DN alternators, when you go to the high output option, don't actually make that much more current at low speeds, the big amps appear at much higher alternator RPM. This is why you don't get much of a fanbelt problem with these. 

I was investigating adapting a CS130 alternator to a Corvair end frame, and kind of gave up on it because these alternators make crazy current at low alternator speeds, and as such, require far higher torque than the 10SI and 10DN units. Upside, absolutely no dimming of the headlights or slowing of the wipers and blower motor at idle, but I am pretty much convinced this thing would overload the stock belt. Hence, I have a bracket for mounting it like a smog pump, and will use a second idler in place of the alternator. 
As an idea of what is going on here, a 10DN or 10SI runs about 4 amps or so rotor current at full output. A CS130 runs about 20 amps rotor current at full output, hence the significantly enhanced low speed output. This was due to a very low resistance rotor winding and a power MOSFET driver and a digital internal regulator in the CS series alternators. 
It may work in the stock position, I just thought the stock belt had enough going in as it was. 

 

John Roberts
 

 

-----Original Message-----
From: Bill H. <gojoe283 at yahoo.com>
To: virtualvairs at corvair.org
Sent: Wed, Aug 25, 2010 1:23 pm
Subject: <VV>  100 Amp Alternator Option


                                                                B"H



Bob:  Clark's sells a "high output" alternator that they list as 65 amps, but 

the tech said it puts out between 80 and 100 amps.



I installed this unit and tightened the belt as you'd normally do with a Vair 

fanbelt, so you can turn the alternator pulley by hand, but it makes an 

impression on your finger when you.



Haven't had any problems with the unit since I installed it a couple of weeks 

ago, and yes, it seems to handle A/C, an aftermarket rear defogger, headlights 

and wipers all at the same time, maintaining around 13-14 volts except when 

stopped at a traffic light when the system shows around 10-11V.  If I gently up 

the idle with the PG in Neutral, the volts go back up to 13-14 with all the 

accessories humming away, so it's definitely an improvement over the stock unit.



Bill Hershkowitz 69 Monza Coupe 110 PG A/C







      

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