[Fot] Oversize alternator pulley source

[Mordy Dunst]

Why run an alternator?   Do vintage rules require an alternator and a lead acid battery?  

Get rid of the alternator and battery and save 30lbs . Get an "antigravity  battery".   It weighs 3 lbs, it is safer and has enough power to run the ignition and fuel pump easily for a couple of 25 min sessions.  Get a simple volt meter in the dash . It starts at about 13.4 volts and ends @ 12.9 depending on how much you need to crank.  Heck get two -one to power the starter and one smaller for the rest of the car. 

That's what I'm told anyways. 


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On Sunday, July 2, 2017, John Styduhar via Fot <fot at autox.team.net> wrote:

Bill, could I use my Denso alternator setup to charge the LiPos or what charging system is required?​


On Sat, Jul 1, 2017 at 1:32 AM, Bill Babcock via Fot <fot at autox.team.net> wrote:
More realistically:  Typical single cell lipo is 3.7V nominal, 4.3 V fully charged so four cells in series is nominally 14 to 16. Volts, which makes electronic ignition systems much happier than the 12.5 volts of lead acid batteries. A typical little battery for a RC model is 5000mah (or 5AH in more normal parlance) and it's a little smaller than a pound of butter. While one of them might actually crank your motor, five or six is a better bet. I had ten handy that I'm no longer using (new drone) so I put them together for peyote. 50AH, 1000Amps of cranking current. If I ever draw that my starter wire will probably vaporize, but the starter spins briskly. pertronix ignition at 6000 rpm draws five amps. So eight to ten hours of running flat out. That's the biggest load by far unless you're running an electric water pump.  

People's bad experience with total loss has to do mostly with lead acid batteries. Electronics are generally designed to run at alternator voltage of 14V. With typical voltage drop an LA battery might drop to 11V at full load. LiPos start with a higher voltage and don't droop as much, so everything works better. 

Sent from my iPad

On Jun 30, 2017, at 8:00 AM, D V <explore8 at outlook.com> wrote:

Elon? Is that you? Drove one of your cars the other day....nice.

Sent from my iPhone

On Jun 30, 2017, at 5:30 AM, Bill via Fot <fot at autox.team.net> wrote:

You know, these days I could build a battery that would power any race car for a couple of weeks and weigh fifteen pounds. Why would I bother charging it?? It’s 2017. I made a battery recently that lets me weld aluminum. I can put it in a lunchbox. Alternator, really? Why?


On Jun 29, 2017, at 5:00 PM, Bob Totten via Fot <fot at autox.team.net> wrote:

What is the size of the shaft on the Denso ??

Curious,

Bob T
stom make? Thanks
>_______________________________________



-----Original Message-----
From: Tony Drews via Fot <fot at autox.team.net>
To: John Styduhar <johnstydo at gmail.com>; Triumph 'Friends of Triumph <fot at autox.team.net>
Sent: Thu, Jun 29, 2017 3:48 pm
Subject: Re: [Fot] Oversize alternator pulley source

I'm not sure of the shaft diameter on the Denso 
alternator, but here's a couple of 
possibilities. I think I'm running the first one.
https://www.summitracing.com/parts/sum-g3969/overview/
https://www.summitracing.com/parts/pwm-182/overview/
https://www.summitracing.com/parts/mor-64800/overview/

basically, search for "alternator pulleys" on  www.summitracing.com

Regards, Tony Drews

At 09:20 AM 6/29/2017, John Styduhar via Fot wrote:
>I'm running a single groove Denso 55A alternator 
>(Lester No. 14684) in my TR racer. Pulley OD 
>is 2 11/16". Does anyone know where to buy a 
>larger diameter pulley for this unit or will I have to custom make? Thanks
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