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alternator drive at pinion
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DRR Pro
posted
I am curious if anyone employees an alternator, mounted on 3rd member housing, driven by a belt off the pinion flange. I know it is done on some circle track setups, just curious if anyone does so in a drag race package.


Larry Woodfin



 
Posts: 1221 | Location: Kilgore TX | Registered: March 12, 2004Reply With QuoteReport This Post
DRR S/Pro
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Other than moving a couple lbs off the front back onto the rearend what does it accomplish ?


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Dave



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Posts: 3372 | Location: Planet Earth | Registered: February 08, 2006Reply With QuoteReport This Post
DRR Sportsman
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Well if you were only interested in charging the battery a few seconds every round...


Burt

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Posts: 1089 | Location: Clinton Township, MI | Registered: September 16, 2002Reply With QuoteReport This Post
DRR All Star
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Not good for us. Stock cars are always moving


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Posts: 4166 | Location: Illinois | Registered: July 08, 2004Reply With QuoteReport This Post
DRR Pro
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just curious. I expect it would not charge enough to be of benefit.


Larry Woodfin



 
Posts: 1221 | Location: Kilgore TX | Registered: March 12, 2004Reply With QuoteReport This Post
DRR S/Pro
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Opposite of what we want. We want max power going down the track and charging when warming up, staging or driving to the lanes. I think some have used a full throttle switch that turned off alternator when wide open to get a few extra ponies but still charges all other times when motor is running.


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Posts: 1381 | Location: United States of Texas | Registered: April 02, 2011Reply With QuoteReport This Post
DRR S/Pro
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Question on alternator and know answer will vary depending upon few things.

What rpm would it take for alternator generate at least half its capability?



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Posts: 2047 | Location: Greensboro NC | Registered: May 24, 2011Reply With QuoteReport This Post



DRR Sportsman
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Mine won't put out any significant charge until about 4500 rpm.
 
Posts: 307 | Location: Southeast | Registered: March 14, 2009Reply With QuoteReport This Post
DRR Pro
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I use one of the super mini 55amp units but it is a 2 wire not 1 wire. I have a 5.125" lower pulley and the 2.5" alternator pulley. On my data recorder it is putting out 13.5 volts at idle and all the way down track. It has never put out much more than 13.7 volts but I have never had to charge the battery even making 13 passes one day. Of course I only have a SBC with 13-1 compression on alcohol. I'm sure if it were a 632 with 16-1 on gas running the fan all the time it might be different. I don't have a way to see amp output. I need to do that I guess.



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Posts: 1214 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR Sportsman
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We bought an ex-NMCA S-10 that has a pulley on the pinion flange, previous owner said he ran it that way until the "rules" said you cannot do it so is has to have some advantage I guess?
 
Posts: 454 | Location: nw ohio | Registered: November 20, 2001Reply With QuoteReport This Post
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