I just learned about these today and thought it would be a neat thing to retrofit. Reduction in vibes is my main reason but seeing one in action is pretty neat. I haven't got a chance to measure or get measurements from the pulley on my k24 but wondering if any folks here have any experience with them. Is this something I can easily adapt or am I kicking rocks up a tree?
I've always thought this was a neat idea too, but all I ever hear is people complaining about them breaking.
In reply to obsolete :
Seems to be a common problem I'm reading about as well. Sounds like a brand name Litens has a better version of it that helps address some of the shortcomings. If I can find one to fit the dimensions it would be a fun experiment. Or a nightmare. I guess I could carry the stock one to swap back if it gave me trouble.
The alternator shaft has to be designed to take the special pulley.
My interpretation of their purpose is that they allow the OEMs to run less belt tension, which makes the belts and accessories last longer (remember when Buick 3.8 water pumps lasted 25-30,000mi?) and reduces parasitic drag. When one of those suckers fails, the belt will flap around and chirp. I've seen alternator inertia pull the belt tensioner to its stop while the other "side" of the belt looked like a jumprope.
It is amazing how much crankshaft speed varies in each revolution! Four cylinders are possibly the worst for it because all of the pistons hit TDC/BDC at the same time making for weird inertial and friction effects.
In reply to Pete. (l33t FS) :
As in the way it fastens to the shaft or the shafts metallurgy and fastening are engineered to handle the "give"?
In reply to captainawesome :
It looks like the shaft needs to be threaded to accept the pulley, with provision to lock the shaft for torque and removal. You might be able to find one to match the threads of the K-series alternator (if they go down far enough), but I don't know how you'd stop the shaft from spinning in order to torque the pulley.
In reply to captainawesome :
The ones I have seen were splined, sometimes have a tapered thread.
Which makes a kind of sense when you think about the forces an overrunning clutch would have on the shaft. (See also the explosion of the flexidrive on Binky - that was due to all of the reverse loads on the shaft due to crankshaft harmonics)
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