Light-weight crank pulleys

[Punisher]

I'm thinking about getting an Unorthodox light-weight crank pulley.. Ultra S series..

My question is.. do they actually make a noticeable difference.. and do they do any harm to the engine with the weight decrease? Anybody here have expirence with light weight pulleys??

[boroEF]

do a search...i inquired about that too.
it's bad for the motor....
it removes the harmonic balancer...then the stress load on the crankshaft is uneven...u could imagine the rest

[Punisher]

So I've been told.. Interesting if I do say so myself.. Although I saw that one company actually makes aftermarket harmonic balancers for their light-weight pulley's so you don't get those bad vibes