Under drive pulley weights...
11-26-2012, 10:45 AM
#1
Under drive pulley weights... ...I know there are a bunch of threads about UD pulleys, but a while back I saw a a post where somebody listed the weights of all the major brands of pulleys. I remember seeing that and saying AH-HA!! Now I know what pulley I am going to go with!! Problem is, that was a while ago and I'm ready to buy my pulley and I completely forgot which one I decided on. Does anybody remember this thread? It was really useful information. Thanks.
11-26-2012, 11:56 AM
#2
Don't remember the thread but I would be careful in buying the lightest harmonic damper as it may not do its primary job causing bigger issues. Weight on something that small in diameter, from an inertial stand-point, is not a good trade-off and won't buy much if any performance gain.
11-26-2012, 03:12 PM
#5
Don't remember the thread but I would be careful in buying the lightest harmonic damper as it may not do its primary job causing bigger issues. Weight on something that small in diameter, from an inertial stand-point, is not a good trade-off and won't buy much if any performance gain.
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11-26-2012, 06:28 PM
#8
I know that since its such a small diameter that the weight shouldnt make a huge difference. However, when you think about it...... its bolted to the crankshaft. If you were going to buy a crankshaft and the quality, materials and specs were all the same except one weighed 4 pounds less you would def pop for the lighter one.
At the end of the day I'm just looking for the post by the guy who listed all the major players in the pully/dampner for LS1 arena. My 32K stock pulley has a wobble otherwise i wouldnt even consider it. I just want to find the right one and weight does seem like a legit consideration point.
At the end of the day I'm just looking for the post by the guy who listed all the major players in the pully/dampner for LS1 arena. My 32K stock pulley has a wobble otherwise i wouldnt even consider it. I just want to find the right one and weight does seem like a legit consideration point.
11-26-2012, 07:21 PM
#9
The balancer's main purpose is to reduce the torsional vibrations of the engine...I understand your thinking that less weight is better which I would tend to agree with you on, just not on a crank pulley...if you want the best crank dampener get an ati
11-27-2012, 02:07 AM
#10
ATI for absolute best or the Powerbond if you want a little less expensive.
ATI makes power not by reducing weight, but by increasing harmonic dampening. That's worth power right there. The Powerbond might do some of that (who knows?) but it gets most of it's power from underdriving the accessories. Which is okay at speed - and if you have a big enough cam where your idle is up, you won't notice any ill effects. Stock car with stock cam might be another story...
ATI makes power not by reducing weight, but by increasing harmonic dampening. That's worth power right there. The Powerbond might do some of that (who knows?) but it gets most of it's power from underdriving the accessories. Which is okay at speed - and if you have a big enough cam where your idle is up, you won't notice any ill effects. Stock car with stock cam might be another story...
11-27-2012, 04:24 AM
#12
I did try a google search, several of them actually. Oh well. In the end I'll probably score a powerbond, but I cant help but feel there was something better out there that didnt cost as much as the ati. Sorry to bring up the same old S with this UD pulley nonsense, that wasnt my intention.
11-28-2012, 07:20 AM
#13
https://sdparts.com/details/powerbon.../kpbu1480-ss25
Anybody know if this is just the UDP or does it also come with an over drive alt pulley? Seems like a pretty good deal.
Anybody know if this is just the UDP or does it also come with an over drive alt pulley? Seems like a pretty good deal.
