<div class='quotetop'>QUOTE (Gilly @ May 27 2008, 10:53 PM) </div>thats interesting you should mention that gilly, i always had it in my mind that when people "added another pulley to up their boost" they got a smaller pulley for the supercharger end.
i know ive heard of people getting "a bigger pulley" but never occurred to me.....oh well learn something new everyday!
as for your question, I'm not exactly sure hey.
from what i remmeber, it wasn't the fact that the solid ones were heavy/lighter it was the fact that they didn't have the rubber inbetween the layers of steel.
the harmonic balancer is acting as a mass damper system on the shaft (look up mass damper in relation to the formula 1's, this was my project, very cool also)
so mass damper is essentially a mass attached to the end of a spring (mass being the outside of the harmonic balancer, spring being the rubber inbetween, in the simple case these are the 2 variables)
like everything this will have a natural frequency, so essentially is what the system vibrates at if its left to its own devices, ie if you smack it with a hammer it will vibrate at a certain frequency (same as the tuning forks in primary school music, or when you smack a lump of metal and you get a certain noise out of it)
so the harmonic balancer would have been "tuned" for a specific frequency in order to "Damper" the out of ballance-ness of the engine.
now if you add a bigger pulley, you would be changing the weight of the pulley, and thus changing the natural freuquency of the system. and thus changing what frequencies the mass-damper system is able to damp out of the engine.
so my thinking is that, the only thing that changing the pulley will do, is change the frequency range that the mass damper is working.
as for if this is bad, i have no idea, it would depend entirely on where the new "damping frequency range" is. if originally it was designed to have a natural frequency at 5000rpm, and with the extra weight its now at like 10000rpm, then its not going to be as effective.
but i have no idea on how much the weight will effect the natural freuquency, from experience on calculating natural frequency it doens't change that much with small changes of variables. but yeah woudl need to model it and see what the computer program spits out.
and i think ive typed "natural frequency" enough times now....
that make any sense?
edit: grub screws? that sounds dodgy as! wanna hope you do them up straight or you'll throw the whole thing out of balance! why don't people get smaller pulleys for the supercharger end?
