Once owned a Nova hit and miss engine attached to a water pump. The engine was a single cylinder water cooled unit. The piston/cylinder wall/head were surrounded by a water jacket that was open on the top. It was designed to run continuously. The water would get hot, not boil. (Other hit an miss too have a water trough)
As some on the forum have issues with a T and a water pump, my question is related to this, the water cooling system of a T is designed to create its own "thermo-" flow to cool the engine, is the fan necessary?
Would not an extra horse or two be gained by not using the fan? Not to mention removing the power drain of the water pump.
My $.02 worth:
A T engine with a clean, in good repair (no loose fins) and leak free radiator/water jacket does not need a water pump. The thermosyphon system works just fine. There are guys who frequent this forum that will say you don't really need the fan either. Of course, if you're traveling 40 MPH in 70 deg. F. weather, you probably don't need the fan. On the other hand, stop and crawl in a parade in 100 deg. F. weather is a different story.
Removing the fan would save a little power, but I sincerely doubt it would be enough to notice while driving.
What Henry said.
You don't need to drive 40 mph without a fan - 5 mph is probably enough, you just don't want to stand still with the engine running for more than a minute or two when it's hot. And if you're stuck in traffic and steam starts to come through the overflow, then it's just to shut it off for a few minutes and wait until the obstacle clears.
And the main reason for me to remove the fan isn't the minimal horsepower gain, it's the reduced complexity. Three common problem areas reduced: the fan belt, the fan bearing and metal fatigued fan blades that breaks.
One alternative is to leave the fan in place but take off the fan belt. With the belt in the tool box it's easy to put it back, should driving conditions call for it.