[DeTomaso] Alternator found

[Tomas Gunnarsson]

3:1 overdrive sounds like a lot to me. What is the max rpm for the
alternator? I'm more used to a 2:1-ish ratio.
 
Tomas

<-----Ursprungligt Meddelande----->
From: David D Fisher [fisher95020 at yahoo.com]
Sent: 12/9/2012 10:35:41 PM
To: Pantera mailing list
Subject: [DeTomaso] Alternator found

My quest for a new alternator has ended, and at the risk of sounding
like a product advertisement I'll share what I ended up with. 
 
You may recal, my primary issue was the at idle with all systems
running,  I was draining the battery at the rate of about 75A continous.
After some searching I found a company that specs output at idle (2400
rpm at the alternator, 800 rpm at the motor) as well as ideal operating
RPM.
 
I just installed it last night in 1 wire mode (although you can wire the
speedo light aka 3 wire mode if you want)
 
I turned on all my consumers  (cooling fans, lights and A/C)  and it was
still charging with about 50 amps to spare at 800 rpm.  Bump the RPM to
2000 and it had much more than enough current than I can consume. 
 
I cant speak to the long term peformance, especially given the pathetic
air flow its going to get up there behind the engine cover but I guess
it's life is still considerably better than the poor baked starter....
Speaking of which, does anyone wrap their starter to try and reduce heat
soak?
 
My Alt is a Powermaster 57141, purchased from Summit.   You can get
Output v.s RPM curves from the Powermaster catalague and they ship the
Alt with a test tag that tells what this actual unit did on the test
bench (pretty impressive, see pic)
 
No problems with fitting on the car, except the high current connector
on the back was dangerously close to my valve cover so I cut about 1/4
inch off the end. 
 
http://www.poca.com/index.php/gallery/?g2_itemId=37998
 
David
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