[Tigers] high speed generator pulley

[Mark Rense]

I don’t think the Hi-Po pulley has the same offset as the Tiger pulley, you will have to redo the mounts if that is the case to get the belt aligned.

 

I’ve been through this dilemma on Tigers and other old Fords with generators. They were marginal when five grand was the upper rev limit, today most modern engine rebuilds are good for 6500 or more. Mechanically the generator is not really designed to spin at high speeds very long (Tigers run around 3K at 70), the bearings will overheat and spall, the brushes float and arc, the commutator breaks down, and then really ugly things begin to happen. Going to the Hi-Po larger pulley helps but you now have a lack of current at lower speeds from a 25% or so reduction in rpm. The combination of your headlamps, tail lamps, gauges, fuel pump, and ignition will consume around 270 watts, that’s 20 amps at 13.5 volts, and the generators I’ve had rebuilt might pump out 25 amps on a good day at max rpm, but at cruising speeds you’re lucky to get half that. Add a GPS, cooling fan or other accessory and you will run out of juice.

 

So what’s the option? Obviously an alternator is the way to go, even under-driven they put out three times the current. But they look so modern. As an alternative I have now installed three PowerGen alternators that look just like the generator. They can generate over 30 amps at idle and are good for 7000 rpm engines. They ain’t cheap but they look just like the OEM generator. They make a one-wire and a two-wire version, the Tiger offset pulley bolts right up.

 

http://www.summitracing.com/parts/PWM-82101/

 

 

The pictures are from my car.

 

Bugz

 

From: Tigers [mailto:tigers-bounces at autox.team.net] On Behalf Of genepadgett--- via Tigers
Sent: Monday, April 06, 2015 2:57 PM
To: Tiger's List
Subject: [Tigers] high speed generator pulley

 

Hi All,

 

In the book Performance Tuning the Tiger there is mention and a picture of a larger than stock generator pulley which slows the generator down and makes it happier to be run at higher motor RPM's.   Call me crazy, but I would like to find such a pulley and keep using a generator for the totally stock look on my higher reving 347 motor.     BTW, my current pulley is about 3.25 inches in diameter.

 

My current generator needs to be replaced and I have a remanufactured one on order.   It comes without a pulley.   So as long as I have to put a pulley on it, I am thinking if I could find a la rger diameter one that would fit, why not?

 

I know there are alternators now available packaged in a generator looking style case but I really do not want to go there at the present time.

 

So does anyone know anything about that larger diameter generator pulley mentioned in the book?   A part number?  Maybe it is stock for some of the other generators back in the day?

 

Any and all info would be greatly appreciated, and thanks in advance.

 

Gene

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/tigers/attachments/20150406/81305cd1/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IMG_0385a.JPG
Type: image/jpeg
Size: 233901 bytes
Desc: not available
URL: <http://autox.team.net/pipermail/tigers/attachments/20150406/81305cd1/attachment-0002.jpe>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: IMG_0390a.JPG
Type: image/jpeg
Size: 188097 bytes
Desc: not available
URL: <http://autox.team.net/pipermail/tigers/attachments/20150406/81305cd1/attachment-0003.jpe>