Drivetrain Pulley talk!
Thread Starter
|
Former Vendor
Joined: Dec 2002
Posts: 116
Likes: 0
From: Texas
Pulley Design
Why re-invent the wheel?
The factory Mini/Eaton pulley is PRESSED on, Steel center hub with a welded on outer sheet metal pulley drive. In high volume this is real cheap and reliable.
Now the press on part is Eatons choice, and as long as your pressing steel onto to steel shaft with the correct interference fit, I've never seen one come apart. So everyone understands what kind of torque this assembly will withstand, there are transmission gears and engagment gears pressed onto main shafts that will handle in excess of 500 hp that do not come loose. Providing the shaft is not damaged and the hole in the pulley is precision honed, your Mini coopers little S/C is not going to place that type of load on the shaft. Remember every Eaton has it that way.
Here are the choices:
All Aluminum: Bad ideal as the parts get hot, the aluminum expands and the hole gets bigger and the pulley falls off. Not a lot of fun at 6500 R.P.M.
Taper fit center mount: This design is similar to the way a drill bite is held into a drill chuck, there is a outer piece with an inside taper, and an inner hub, with an outside taper and when you lock the two together your pinching down on the shaft to hold tight. Well guess what? I've had plenty of drill bits spin in the chuck, and screw up the shank of the drill bit. And if you locking this together with a few 6mm bolts, your never going to lock it down as tight as a press fit. I'll bet my Mini's Supercharger on the press on system, just like Eaton, Mercedes, Ford Lightning, etc.
Now, that we've decussed the different mounting styles. And the pros and cons of the different systems. Let's also talk about product installation. That plays a big part in the success of the job. Questions you need to ask! Does the person doing the job have the experience?? Is he a friend helping you out??, Or is this a real business with some real business history, or just an enthusiast working out of his garage? The odds of the job getting screwed up in the installation is far greater than the product being of poor design. Does the installation shop have the proper tools? Does the installer have any Garagekeeper liability insurance to cover the cost of the screw up if something were to go wrong?? Having someone install your parts for cash, and without an invoice. Leaves the liabilty problem in your hands the owner of the car. Buy your parts from a REAL supplier, and have them installed by a REAL repair facility.
Al Hafner
Why re-invent the wheel?
The factory Mini/Eaton pulley is PRESSED on, Steel center hub with a welded on outer sheet metal pulley drive. In high volume this is real cheap and reliable.
Now the press on part is Eatons choice, and as long as your pressing steel onto to steel shaft with the correct interference fit, I've never seen one come apart. So everyone understands what kind of torque this assembly will withstand, there are transmission gears and engagment gears pressed onto main shafts that will handle in excess of 500 hp that do not come loose. Providing the shaft is not damaged and the hole in the pulley is precision honed, your Mini coopers little S/C is not going to place that type of load on the shaft. Remember every Eaton has it that way.
Here are the choices:
All Aluminum: Bad ideal as the parts get hot, the aluminum expands and the hole gets bigger and the pulley falls off. Not a lot of fun at 6500 R.P.M.
Taper fit center mount: This design is similar to the way a drill bite is held into a drill chuck, there is a outer piece with an inside taper, and an inner hub, with an outside taper and when you lock the two together your pinching down on the shaft to hold tight. Well guess what? I've had plenty of drill bits spin in the chuck, and screw up the shank of the drill bit. And if you locking this together with a few 6mm bolts, your never going to lock it down as tight as a press fit. I'll bet my Mini's Supercharger on the press on system, just like Eaton, Mercedes, Ford Lightning, etc.
Now, that we've decussed the different mounting styles. And the pros and cons of the different systems. Let's also talk about product installation. That plays a big part in the success of the job. Questions you need to ask! Does the person doing the job have the experience?? Is he a friend helping you out??, Or is this a real business with some real business history, or just an enthusiast working out of his garage? The odds of the job getting screwed up in the installation is far greater than the product being of poor design. Does the installation shop have the proper tools? Does the installer have any Garagekeeper liability insurance to cover the cost of the screw up if something were to go wrong?? Having someone install your parts for cash, and without an invoice. Leaves the liabilty problem in your hands the owner of the car. Buy your parts from a REAL supplier, and have them installed by a REAL repair facility.
Al Hafner
Thread
Thread Starter
Forum
Replies
Last Post
elverado
R56 :: Hatch Talk (2007+)
2
Jan 18, 2022 02:51 AM