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Alternator question

 
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Tue Feb 14, 2012 11:01 pm    Post subject: Alternator question Reply with quote

I'm working on a Mustang for a buddy. I'm updating and in general fixing stuf and getting it to be able to pass tech. One thing I'm thinking about getting him to add is an alternator. I think the car will be faster or at least won't be any slower and he'll have one less thing to worry about at the track. Here's a quick run down of the car. Around a mid 80's Mustang absolutely gutted, decent 351W, good pistons, stock crank and rods (probably has good bolts), Victor Jr. heads and intake, 750 Holley dp and a 175 shot by Compucar. He shifts around 5800 - 6000. It has the following electrical - 2 Holley blue pumps (about 4 amps each), electric water pump drive (6 amps), electric fan (maybe 20 amps), MSD ignition (1 amp/1000 rpm), nos system (14 amps) and he might have to run lights on the return road at some tracks. Total draw is around the 50 amp range, I told him I would turn the fan off during a pass. What is everybodies opinion on what an alternator would do to it? The car runs 6.20's in the 1/8th now and we would like to get in the 5's without being too much harder on the engine - looking for efficiency gains first. Clay
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squeeezer
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Tue Feb 14, 2012 11:48 pm    Post subject: Reply with quote

Ignition probably always had 12 volts
Now no more charging between rounds

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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Wed Feb 15, 2012 12:06 am    Post subject: Re: Alternator question Reply with quote

clay wrote:
Here's a quick run down of the car................................ MSD ignition ..........................looking for efficiency gains first. Clay


MSD will be MUCH happier on 13.5v-14v than on 12v. put an alternator on it. been down that road with a buddy. car was night and day difference.

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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af2
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1933 Willys Coupe

PostPosted: Wed Feb 15, 2012 12:24 am    Post subject: Re: Alternator question Reply with quote

10sec.et wrote:
clay wrote:
Here's a quick run down of the car................................ MSD ignition ..........................looking for efficiency gains first. Clay


MSD will be MUCH happier on 13.5v-14v than on 12v. put an alternator on it. been down that road with a buddy. car was night and day difference.


Yep the couple HP the alternator takes to charge the battery is nothing compared to a MSD running at 12 volts or less going down the strip.
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squeeezer
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1991 Chevrolet Camaro

PostPosted: Wed Feb 15, 2012 1:17 pm    Post subject: Reply with quote

Isn't it funny we state "12 volts" as being good even though we are thinking 12.6 to 14 Laughing
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squeeezer
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Joined: 02 Mar 2007
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Location: new richmond WI
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1991 Chevrolet Camaro

PostPosted: Wed Feb 15, 2012 1:18 pm    Post subject: Reply with quote

Ohhhh....and I wouldn't even think about not running one
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clay
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1972 Chevrolet Nova

PostPosted: Wed Feb 15, 2012 11:11 pm    Post subject: Reply with quote

I agree and I'm going to do my best to persuade him. I can't think the battery can maintain even 12 volts all the way from the crank up to finishing a pass. I have to think it's more like 11 - 11.5 and I have to think that improved ignition performance will get back what little the alternator takes. Thanks for the input guys! Clay
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10sec.et
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1969 Oldsmobile Cutlass

PostPosted: Wed Feb 15, 2012 11:43 pm    Post subject: Reply with quote

after a pass, coming back up the return road, stopping to pick up your timeslip, the voltage on my buddys car was down to about 10v. he would get three passes with 10-15 minutes charging in between and then he was done. the car would start misfiring and banging out so bad he could hardly get it on the trailer. of course, there are people who have no problems at all but my experiences without an alternator were not so good.
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William Jones
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Location: Lake city, FL
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1971 Ford Mustang

PostPosted: Thu Feb 16, 2012 12:39 am    Post subject: Reply with quote

I usally try to run an alt if we are talking a bracket car if we are talking a go as fast as you can car run a 16V battery I run two 16v in mine and it has been fantastic and will flat out turn my 15.3comp motor over like the plugs arent even in it. I never see less than 14.8 volts even after 5 passes without a charge. I cool the car down with my 12v charger in between runs. My car was faster without the alt but only 6 hundredths in a back to back pass.

Bam

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