Alternator and Crank pulleys for a Drag application.

I want to put a small alternator on my car this spring. Has anyone here found a specific pulley combo that can be bought for this application? I think I should have an oversize alternator pulley and a smaller crank pulley to slow it down a little. I'm turning about 6500 at the stripe. My water pump is electric. I've seen some aluminum stuff on line but I was hoping some of you guys might know a proven combo/manufacturer that has worked for you.

Had to make my own.   9200 at line..  even "race" stuff wasnt slow enough.

6500 isn't going to hurt anything and Dennis at dscmotorsport.com  makes a nice billet crank pulley for 50 bucks and you can make the brackets for about 11 bucks from the hardware store, I've yet to throw a belt even at 7k and I've put this setup on three cars now using the regular gm one wire alternator

May not toss a belt.  Alternator doesn't really need 14k rpm.  Honestly anything above about 4800 rpm and the alternator is maxed oit.

Looks like a good solid setup to me... if the alternator doesn't need the rpm it should not matter, if it is wired and regulated correctly. If the alternator can't handle the given rpm, then you need to regulate the alternator, or reduce the rpm to the alternator... different pulley sizes are available for the crank and the alternator find what fits your application.

I followed their recommendations and my stuff has been wrkn great.

http://www.powermastermotorsports.com/power_pulleys.html

I went w a 2:1 ratio (alt is overdriven) on mine since it does see some street miles.

Powermaster offers 3 different size pulleys that may work for you, 2.8", 4", and 5-1/4".


That's the 2.8" on my alternator. My crank pulley is a custom deal I had made for mine. At the time when my engine was built Peterson didn't offer Spline Drive V belt pulleys (they do now, 2.5" & 3.5" dia.) so I had one made that fits between the crank trigger wheel and the spline drive mandrel. With Powermaster alternators  they do have a cut in point, so when you slow them down you have to remember to blip the throttle so it starts charging.

nuclearcobra wrote:6500 isn't going to hurt anything and Dennis at dscmotorsport.com  makes a nice billet crank pulley for 50 bucks and you can make the brackets for about 11 bucks from the hardware store, I've yet to throw a belt even at 7k and I've put this setup on three cars now using the regular gm one wire alternator

News Flash DSC doesn't make anything He resells that is a March Pulley I have one

I have a front plate on mine so it will be a custom mount anyways...Likely go with a small jap buggy alternator or a Powermaster one wire deal.

On the one wire alternators you can always run an ignition wire and it will charge like normal instead of having to get over 1500 rpm or where ever it turns on at. I ended up doing this on a couple of my cars. Once charging they are supposed to stay charging but I have not had a lot of luck with the Powermaster units working properly over time. They have warranty on them but if you have to start shipping them across the country because they don't work then warranty doesn't really mean crap because the shipping costs will kill you. I would rather just have a unit that works properly. I have junked two of them now and the one in my 56 just charges whenever it feels like it so it will get replaced soon.

the Coug wrote:

nuclearcobra wrote:6500 isn't going to hurt anything and Dennis at dscmotorsport.com  makes a nice billet crank pulley for 50 bucks and you can make the brackets for about 11 bucks from the hardware store, I've yet to throw a belt even at 7k and I've put this setup on three cars now using the regular gm one wire alternator

News Flash DSC doesn't make anything He resells  that is a March Pulley I have one

No way man he just makes them for March

You really need to change drugs you are hallucinating

the Coug wrote:You really need to change drugs you are hallucinating

Pass the pipe buddy......

the Coug wrote:You really need to change drugs you are hallucinating

Well maybe some people like hallucinating , Do you really think the Indians only stuffed tobacco in those big peace pipes

Yea...I don't think tobacco was the reason they called them "Peace Pipes"

I used a Db electrical 105A on mine w a 5"BBC crank pulley from East Coast auto electric.(Had to open up the center bore to register over the raised snout on the FRPP balancer.)

That looks simple enough. Outside of the snout modification did the BBC bolt pattern line up with the BBF balancer?

Yes...but only because the ford racing balancer comes w both bolt patterns (3 bolt chevy and 4 bolt ford)