Fan Belt Speed (pulley ratios)

[Ben Umberger]

Greetings,

I am working on a 29 and and when it came to me it had a 1/2" belt which sits lower in the pulleys.

When I replaced it with a 5/8" (standard Model A) it rubs the radiator inlet hose so I put back a 1/2" belt.

The question is can anyone tell me since the belt sits lower in all of the pulleys is the fan speed unchanged, faster or slower?

I do have an over heating problem which I think is actually a new (used) radiator but the fan speed question bugs me.

Thanks