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Rear Axle Mounted Alternator

TheYeti

TheYeti

Active Member
Anyone here have real experience and not just theory on whether it's feasible for a car that will be a cruiser?

It would be a car that's driven on the highway to work or out Sunday bar hoppin... Not a show car situation, not interested in parades either so never any extended periods of idling past that of a wait at a red light.

Do they charge well?
 
Ah, I've been running my alternator off the driveshaft at the rear U-joint for 30 years:
alternator1.jpg
..it's a 100 amp GM CS alternator. Charges fine over about 20 mph. I use an Optima AGM yellow-top battery, made for fast charging and deep discharge, so I'm OK in stop 'n go traffic and sitting around idling. And the Optima is over 10 years old and counting. Regular batteries only lasted 2-3 years.
 
PotvinGuy said:
Ah, I've been running my alternator off the driveshaft at the rear U-joint for 30 years:
View attachment 22213
..it's a 100 amp GM CS alternator. Charges fine over about 20 mph. I use an Optima AGM yellow-top battery, made for fast charging and deep discharge, so I'm OK in stop 'n go traffic and sitting around idling. And the Optima is over 10 years old and counting. Regular batteries only lasted 2-3 years.
Click to expand...

Awesome. Thanks for the input! I think I'm gonna find an alt and build the bracket. That GM CS looks nice. Is it smaller than the old 10si case?
 
It appears that the alternator is mounted to the frame. How does that work as the rear end moves up and down? Is it still OK?
 
The center section of the Jag RE is mounted to the frame, so mounting the alt. to the frame isn't a problem. Having a typical RE, you'll have to mount the alt. off of the RE it's self.


iu
 
I used a caliper from a go-cart. Cable operated and works just fine. I think you can now get hydraulic ones, if you wanted.
 
Interesting thread, but what is the advantage to a Rear Axle Mounted Alternator?
 
TheYeti said:
Awesome. Thanks for the input! I think I'm gonna find an alt and build the bracket. That GM CS looks nice. Is it smaller than the old 10si case?
Click to expand...
I don't know. I bought that one 30 years ago. The dummies at Ron Francis told me it was a CS unit. They also told me it was "too complicated" to give me a wiring diagram! Turns out to be a simple 2 wire hookup.
 
Below are the dimensions for a GM CS-10si alternator. Thought this might help. I also measured my
CS-144 on the car for diameter and it's about 1/2" larger.

Delco_10SI_PerformanceCurve.jpg
FP04_CS10si_Dimensions_03112.jpg

FP04_CS10si_Dimensions_03114.jpg
 
There are a lot of high output, small diameter options available. Do a quick google to find suitable candidates, taking rotation and rpm to activate specs into consideration and go bone yarding!
 
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