Alternator chart
Thread Starter
Le Mans Master
Joined: Sep 2000
Posts: 5,635
Likes: 4
From: Orlando Floriduh
Alternator chart
From time to time the topic of alternators comes up. The alternators used on corvettes is unique to Corvette and the chart clearly shows the difference. So when you buy a generic rebuilt you get a Chevy unit. That's why it is common for the voltage to be very low at idle.
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
Re: Alternator chart (Larry B.)
Yup, NAPA got me. I have their part number 13-4011A. It puts out right at 13 volts at idle cold and then 11.5 volts at idle when hot. If I had a NAPA part number for the right alternator, I'd force em to trade up. Any help?
Brett :thumbs:
Brett :thumbs:
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Re: Alternator chart (Brettmc)
Oh, Jeezus, here we go again, this same bull crap discussion going around again....look at the archives....
yes they may have made some internal changes to the vette alternators in our era, but what that compensated for was the most likely smaller diameter crank pulleys, compared to say a Pontiac or Caddy/Olds of similar design and era.....so the vette pulley cant spin that underpowered POS fast enough...
the cure is to go to a SI17 or 17SI whatever series alternator, they work fine, rated at 108 amps in my version and I have to have the brights, and driving lamps, and a/c on in gear at night OH, I have electric cooling fan,.....before it goes to around 12.5 volts output.....I have a voltmeter....so I know these things...
now that is about twice any rated so called 'vette' alternator, and is common as green grass.....it works fine....about the only thing they could do is increase the amount of poles on the field winding, that's about it....
so for you NCRS types, well have fun chasing the holy grail, but for us hotrodders/drivers....just do the obvious, and have done with it....
GENE
yes they may have made some internal changes to the vette alternators in our era, but what that compensated for was the most likely smaller diameter crank pulleys, compared to say a Pontiac or Caddy/Olds of similar design and era.....so the vette pulley cant spin that underpowered POS fast enough...
the cure is to go to a SI17 or 17SI whatever series alternator, they work fine, rated at 108 amps in my version and I have to have the brights, and driving lamps, and a/c on in gear at night OH, I have electric cooling fan,.....before it goes to around 12.5 volts output.....I have a voltmeter....so I know these things...
now that is about twice any rated so called 'vette' alternator, and is common as green grass.....it works fine....about the only thing they could do is increase the amount of poles on the field winding, that's about it....
so for you NCRS types, well have fun chasing the holy grail, but for us hotrodders/drivers....just do the obvious, and have done with it....
GENE
