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-   -   altenator pulley ratio to crank (https://classracer.com/classforum/showthread.php?t=30572)

west coast 01-02-2011 11:04 PM
Re: altenator pulley ratio to crank
 
Wade are your pulley numbers backwards or is it just me. I have found pulleys for my crank with ratio of 2.26 and 2.10 for my altenator pulley size. Thanks guy's for the helpjust need to make brackets now.

nwebber 01-02-2011 11:08 PM
Re: altenator pulley ratio to crank
 
Is there any benefit to underdriving the alternator?

Tom Goldman 01-03-2011 01:19 AM
Re: altenator pulley ratio to crank
 
Wades numbers are right for a Stocker that needs no real alternator output.
carburated Stockers run faster with a fully charged battery and an alternator that is really just along for the ride.

GTX JOHN 01-03-2011 04:30 AM
Re: altenator pulley ratio to crank
 
I agree with Tom and Wade.....That how we run all our stockers (Although not the truck we use to tow them Home).

Tom keedle 01-03-2011 05:47 AM
Re: altenator pulley ratio to crank
 
Quote:
Originally Posted by Tom Goldman (Post 230978)
I tried one on my car when I had a micro v belt system on the car.
Two of them failed ,altho they were OEM units. ... locked up the overunning clutch.
may have been the rpm range , as I was running a small engine at the time and hitting about 8400 in the traps.
The most common application of these pulleys is on diesels ,to help minimize belt screech at shut down. ...They also cut down on belt whip when a automatic tensioner is employed .
i was kinda thinking that might help on gear changes...just a thought.

Bob Bender 01-03-2011 10:33 PM
Re: altenator pulley ratio to crank
 
Quote:
Originally Posted by Wade_Owens (Post 231075)
x2, I have an east coast alt. also. 3" crank, 5" alt. no issues at all.

Wade O
Me too.......................

west coast 01-04-2011 11:52 AM
Re: altenator pulley ratio to crank
 
I should have mention this is a stocker. Wade and Bob are you guys just running off the battery and not running any electricity to the altenator?

GTX JOHN 01-04-2011 05:12 PM
Re: altenator pulley ratio to crank
 
We use Denso Alt. and still have 13.8 to 14.2 volts above 2,500 with above ratio.....I like all the voltage I can get with MSD. We are seldom below that RPM even in Pits.

John Irving

Wade_Owens 01-04-2011 05:17 PM
Re: altenator pulley ratio to crank
 
Quote:
Originally Posted by west coast (Post 231321)
I should have mention this is a stocker. Wade and Bob are you guys just running off the battery and not running any electricity to the altenator?
With my ICE Ignition, he likes to see over 14v. By about 3000-3500 rpm's, I have 14.4

I did have a racepak on for awhile, after peaking at 14.4, it stayed there for the duration of the run.

We do have to have a working alternator, hooked up and charging as per rules.

Wade O

Bob Bender 01-05-2011 02:40 AM
Re: altenator pulley ratio to crank
 
Quote:
Originally Posted by west coast (Post 231321)
I should have mention this is a stocker. Wade and Bob are you guys just running off the battery and not running any electricity to the altenator?
My alt. turns on at approximately 3000 to 3200 rpms and puts out 14.2 volts.


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