Quote:
Originally Posted by industrial
I wonder how many people bother to have the clutch cover and flywheel balanced before installing. Flywheels are usually balanced well but as an assembly with the cover they can be off by a lot. They need to be balanced together. Perhaps changing the stock balanced rotating assembly with some unbalanced parts induces some need for the compliance inherent in the stock pulley. The stock pulley is a harmonic balancer which is not required by the engine according to oem engineers.
|
Clutch components are zero balanced, so they don't need to be balanced together unless they're sub-par.
There is still no proof that the OEM engineers said anything of the sorts...
Quote:
Originally Posted by Infamous Performance
Yes. The stock OEM crank pulleys do absorb some vibration. They are technically 2 pieces separated by a thin rubber "absorber". When the pulleys age (heat also seems to play a role) the pulleys can eventually separate. I have seen this too (catastrophic loss of the engine). The separation "issue" is one of the factors that drove many early EJ adopters to the single piece LWCP.
|
Yep, it's common to run ATI dampers in the other car circles I run in because of this failure (as the OEM pulley is actually more expensive). Not to mention ATI is SFI rated while none of the normal LWCPs are.
Generally speaking though, pulleys are a bling item and nothing more (unless you're talking underdrive pulleys which introduces it's own set of issues).