99gtguy5usmc

I just put bbk underdrive pulleys on and I had to slide the bbk crank pulley onto the stock crank pulley to act as a balancer. The stock pulley wobbles very slightly at idle but not when the rpms are up and the bbk pulley doesn't wobble at all. I don't think it seated all the way. I'm wondering if I'm going to f'up my motor with the stock one wobbling or if it will be alright since the bbk pulley is fine? Any help will be greatly appreciated!!!

stevednmc

So you have the piggypack style? It is highly recommended that one does not get those for the very reason you are talking about. If I were you id get rid of them and, if you insist on underdrive pulleys, get the steeda replacement pulleys...but thats just me.

cliffyk

^+1.

Take them off, and throw them away (at least the piggyback crank pulley), and get an SFI approved harmonic balancer before you do some serious damage to the engine...

00gGT

What pulleys are good to replace? Is it true the alternator pulley is not worth it because it will drain ur battery?

cliffyk

Any that use a replacement harmonic balancer/crank pulley that meets the SFI 18.1 specification.

I believe BBK makes such a balancer, however it comes with aluminum water pump and generator pulleys. Aluminum is a horrible material for belt drive pulleys because it is too soft and abrasive particles will become embedded in the pulley and chew up the belt. No belt manufacturer recommends aluminum pulleys for poly-V belts, the only advantage they provide is to the maker--because they are cheaper to machine and arguably prettier when they are all shined up.

Steeda's UDP set is AFAIK the only remaining are SFI rated pulley set using all steel pulleys. Summit has their own "house brand" SFI spec'd balancer.


I have never had a problem with battery charging, however if your car is a boombox on wheels or has some other high electrical power needs you might.

FWIW--Here are some numbers comparing the stock pulleys and Steeda's UDPs:

jgordon

just a quick question about the alternater pulley,if i could just use the stock
pulley,because the belt is pretty tight.