I have a 1925 Tudor with a 1925 motor. At present it has an improved (26-27) fan/pulley support installed, instead of the older arm type. This looks like a far better setup, ease of adjustment, with the cooling benefit of the fan being more centered in front of the radiator. My question is, If I went back to the older style in the name of "correctness" what would I lose,maybe a little cooling ability. The radiator is fitted with a flat tube core and works fine. I've had no overheating problems, even on 100 degree days. I need to replace the pulley and shaft anyway so for me it would mean just finding the correct arm, purchasing the correct shaft and installing a new pulley.
Thoughts anyone, and thanks in advance.
You might have a late 25 with hogshead that bolts to the back of the block. I would use the fan pulley bracket that you have. If you do have the later engine I don't think the timing cover has provisions for the earlier arm style bracket.
My first day 26 style engine made july 27, 1925 has holes for adjustment of the older style fan arm. You can try drive it without any fan - works for me, as long as I don't stand still idling for more than a minute before moving along - 5 mph is enough speed for it to cool great without a fan
Thanks Ted and Roger. The timing cover does have provisions for the older style arm, that's what caused me to investigate further. I guess there is no real downside to the older style.
The belt position changes slightly when switching between the two styles of fan.
Everything cleared when I had a 1919 motor in my T but when we changed to a 27 motor with the new style fan bracket the timer arm ran into the belt at full advance.
We used the same timer on each motor.
If it works, don't fix it. Only if you will be using the car for a show car where there will be judging for authenticity would you need to be concerned about what fan to use. You would need to do some research on your car to see what date the car was manufactured, and when the fan was produced to be sure you have the correct one. If this is a tour car, just leave it alone. 99.9% of the people who see it wouldn't know the difference.
Charles: If you stay with the improved style fan, you will need the Early 26 fan. It is not the same as late 26/27. That is if you want to be correct. Dan
Early '26 fan eccentric wasn't a good design - too easy to break ! Ford re-designed them for a reason. YMMV !
There is nothing wrong with the 1925 fan set up. Why change it?
Thanks Fred,Norman,Dan,Steve and Larry for your time and additional input. According to the block serial number it looks like it was made in February of 25. The older arm idea was just that, an idea. As mentioned the present pulley, shaft and casting is of the "Improved" variety.Both pulley and shaft are worn resulting in some "wiggle" and noise if not heavily greased. If there were no worn parts it would be left as is. I just figured that now would be the time to go back to the older style arm if I could. To be honest I think the older setup looks kind of neat. For the most part that is what fueled the thought process.
I don't foresee the car ever being judged, I like driving it too much. Once again thanks everyone. You've made this newbie feel welcome.