Who Would Have Thought...

[Gear grabber]

...it would be so hard to find a 2.5'' aluminum 3g pulley.
I am not having much luck.

 

[Noobz347]

http://marchperformance.com/ford-sm...ratio-6-rib-serpentine-alternator-pulley.html

 

[Gear grabber]

Thanks,i have seen that. The link says 79-93 (2g)
Will that work on a 3g ?

 

[Noobz347]

http://www.stangnet.com/mustang-forums/threads/3g-alternator-pulley.722485/

 

[Gear grabber]

Now the link goes to part #228 2 3/8 replacement pulley.

 

[Noobz347]

The first link I posted is for an aluminum alternator pulley.

The information in the second link explains how to use a 2G pulley on a 3G alternator.

On a side note: UD pulleys are a waste of time and money. The stock 3G alt pulley is effectively an underdrive for a Fox. It can cause charging problems at idle. The 2G pulley has a slightly smaller OD and works well at idle on a 3G alt.

 

[Gear grabber]

My concern right now is max alt. speed. With my 6'' crank pulley
2.25'' alt. pulley and 7k limiter,the alt. will see brief periods of
18,666 rpm. With a 2.5'' it will see 15.6k at 6500 shift and 16.8
at 7k.

 

[Noobz347]

Then you should stick with the OEM 3G pulley.

 

[Gear grabber]

A couple weeks ago,i picked up a 66mm (2.59'') pulley from PA Performance.
So far no charging problems. My car has a fairly long duration cam,and idles
900/950. With,5.8'' crank pulley,divided by 2.59 alt. pulley x 925 = 2071 alt.
speed at idle and a safer 15,675 at the 7k limiter.

 

[90sickfox]

I used the pulley off of a 97 escort alternator...has worked very well for years. Not sure of the size. Its smaller than the stock 3g pulley.

 

[Mustang5L5]

Thanks,i have seen that. The link says 79-93 (2g)
Will that work on a 3g ?

Only difference is the length of the snout on the pulley that slips over the shaft. The 3G ones are a bit longer, so if you put a 2G pulley on a 3G alt, it will hit the case and not spin.

The solution? a 5/8" washer. Slide it over the shaft, and then put the pulley on, and problem solved.

https://www.autospecialties.com/ford.html

Bottom of the page. Not Aluminum though

I've had the 1 7/8" pulley on my 3G with a washer for years.

 

[Chuckman]

i just use the stock 3g pulley, no problems.