Does the crank pulley have a harmonic dampener?

 

yes, you talking about the stock one right?

 

Stock one does, yes.

 

Cart fan and 1107 thanks!

 

uhhhh...what the hell is a harmonic dampener?

Ryan, who does not know these things

 

supposedly stops harmonic vibrations from the crank

 

cancels the second and third degree harmonic vibrations generated by the motor...
if it was a straight six or v12 it wouldn't need one
(engineers chime in here pleese)


Nick (who rode in an M3 today - straight six torque OWNZS)

 

dont forget flat 6, Porsche OWNS

 

Actually, it is needed by straight six engines (and by extension, V12) as well. BMWs have harmonic dampers on their crank pulleys. The torsional vibration that they damp is separate from the vibration caused by reciprocating and spinning parts.




[Modified by Gansan, 3:05 PM 10/18/2002]

 

Is that the N1 pulley? I thought the N1 pulley has no harmonic balancer.

 

n1= no harmonic balancer
stock = harmonic balancer

i think the pic is an n1

 

so can't u take of the dampener off the stock and put it on the UR one?

 

no

 

well which part is the dampener? im lookin at a UR crank which is in my hands now, and it looks the same pretty much

 

So is the OEM N1 pulley safe for ur engine? Seeing that it doesnt have a damper?
Is it worth buying?

 

The purpose of the harmonic balancer is to absorb unwanted vibrations that the cranks gives off. With out the harmonic balancer the vibration will effect your oilpump and rod bearings making them wear out faster. This is why you don't want a knife edge crank for street purposes.

 

It is the black rubber "donut" sandwiched between the outer (thicker) brasslike colored ring and the thinner silver colored ring.


[Modified by RagingAngel, 4:55 PM 10/22/2002]

 

That looks like a stock pulley from the backside.

I have a stock ITR pulley that has been machined to keep the harmonic dampner intact and then balance. Removed aprox 2lbs from the pulley. there are only groves for the ALt belt, a/c and p/s have been removed.

I have one I can sell IM me

 

The UR crank doesn't have it, so don't use it.

 

Steve's gonna have something to say about that..hahha....