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Poor boy cast iron pulley.

676 views 7 replies 3 participants last post by  redwing52 
#1 ·
Anybody have an opinion on running a cast iron pulley? Is it safe to run at high rpm's?
 
#2 ·
All depends on balance and how it's made. As long as it's rated for a speed higher than you need, no problem. Split taper bushed pulleys are great. Especially if you install them with a dial indicator to get the axial runout perfect. If it's something old you have laying around with no specs, I would think twice about using it.
 
#8 ·
All but certain that is not a split tapered bushing. If you look at the other side it would have 3 threaded holes if it were split tapered. The purpose of the split taper type pulley is that they can use one pulley for a lot of different size shafts. You can change the shaft size by just changing the bushing. Suppliers don't have to stock near as many pulleys that way but they are a pain.

Just put that one on and tighten the setscrew/s if it has any. Can't really true p a standard bore pulley as they are good to go right from the manufacturer.
 
#6 ·
6670 is a little under redline, but you should be fine, as peek torque and best shift points are far below that. If it concerns you, just find one rated a bit higher. Taper bushings are just a way to mount pulleys that makes them grip the shaft and run really true. Depending on how you do the conversion it will be up to you to make everything strong with no runout. Some people have done a great job making everything fit perfect, while others have just slapped things together and adjusted with a hammer, and both methods have had success. I guess it all depends on your level of OCD. ;)
 
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