2 Blade Fan Shortage

As mentioned above, beware of old fans. I had a big chunk of fan blade fly off of my ‘26 T - luckily went straight down to the ground without damaging radiator or sheet medal. A friend gave me another ‘26 fan - came apart in my hands. Replaced with a new fan from Snyder’s - been fine since.
A ‘31 Sport Coupe followed me home a year ago - added a new leak-lesss water pump and aluminum 2 blade fan (no grinding needed) and a tapped gooseneck and vintage S/W temp gauge - runs 140 degrees in 90 degree weather.
Changed the water pump studs for bolts - removed three blind studs easily - used heat and wax method to remove upper right-hand (pass. side) stud that goes into water jacket.
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I have a late '31 original two blade fan. It looks like Ford knew of this breaking issue prior to the end of Model A production and modified it's construction to alleviate the fan problem. Question: Is this modification enough to trust installing?
 
A two blade cast aluminum blade fan is available from most vendors. The best place to buy an original fan would be as a flea market so you can inspect the blades for cracking next to the hub area. Don't try to rotate the engine with the fan blades when setting timing etc. When original fans fail your hood and/or radiator will be damaged!
 
nkaminar said:
I don't remember the source, but the 4-blade fans and the 2-blade fans perform the same.
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I also can't seem to find the data, but I recall that the 2-blade had slightly more airflow at idle than the 4-blade. Even though the 4-blade is better than the 2-blade at higher rpms, the plastic fan is the best one of the three for airflow at all speeds.
 
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