Dumb Question Thread - No Flaming Allowed

[IamFODI]

I guess it's a vibration damper because that's what BMW calls it. I've always thought the dual mass flywheel was the more effective harmonic balancer in the system.

If it's a damper, that means it works by absorbing vibrations.

A balancer is different; it has a counterweight on it to balance the rotating assembly (and probably a damping element as well).

Without a damper, your engine would make more NVH and not live as long. Without a balancer, your engine would run like a jackhammer and grenade in short order.

Pretty sure the crank pulley and maybe the flywheel in this engine act as dampers but not balancers. The engine is internally balanced. I can't imagine how an I6 would ever need an external balancer.

You might be right about the DMF technically doing more than the crank pulley to absorb vibration, though I'd imagine they absorb different frequencies from different sources, so they're probably complementary more than comparable.

[fattycharged]

How much, if any, play is acceptable on the output of the trans?

*rotational



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[zzyzx85]

Harmonic balancer or vibration damper?

I guess it's a vibration damper because that's what BMW calls it. I've always thought the dual mass flywheel was the more effective harmonic balancer in the system.

[L0okitzRaj]

crank hub doubles as a harmonic balancer. I would start looking to get that replaced.

damn. thats what i was scared of.

thanks for the input.

[IamFODI]

crank hub doubles as a harmonic balancer.

Harmonic balancer or vibration damper?