What Else Should I Change When I do My Clutch?

[ethan]

The length of the crank in an I6 is already an issue for high RPM motors (hence the torsional damper on the front.) I8 would be even worse and, as you mention, have still worse packaging.

Edit: https://en.wikipedia.org/wiki/Engine...linder_engines

Pretty much explains the S54 design decisions.

[mrgizmo04]

There was a good paper on the old forum about all the oscillations and vibrations in the crank, I thought I saved it, but I can't find it. Believe it was posted by Drewster, IIRC. If anyone has it, please post up.

[Arith2]

That link helped me understand quite a bit.

[SteelGreyM]

Don’t get a brass pin. It will likely deform and bend before you even install it. They don’t fit perfectly and need some persuasion

[mrgizmo04]

Don’t get a brass pin. It will likely deform and bend before you even install it. They don’t fit perfectly and need some persuasion

I find that all metal ones (brass, bronze, steel) require some filing down to fit properly into the bellhousing at proper height.

[heinzboehmer]

I find that all metal ones (brass, bronze, steel) require some filing down to fit properly into the bellhousing at proper height.

Even the BMW steel pin (21511223281)?

[mrgizmo04]

Even the BMW steel pin (21511223281)?

I did steel on one of the trannies, diameter on the end going into bellhousing had to be filed. Maybe it was a bad batch few years ago.

[heinzboehmer]

I did steel on one of the trannies, diameter on the end going into bellhousing had to be filed. Maybe it was a bad batch few years ago.

Good to know. Thanks!

[mrgizmo04]

General comment on nvh that was mentioned earlier specific to the metal pins - with everyone running straight pipes, solid bushings, airboxes, nvh from the pin should be the last thing on your mind, lol.

[heinzboehmer]

General comment on nvh that was mentioned earlier specific to the metal pins - with everyone running straight pipes, solid bushings, airboxes, nvh from the pin should be the last thing on your mind, lol.

I was just worried that it would introduce noise and clunks at low speeds. The dual mass flywheel does enough of that already. Seems like this is not the case though, so I ended up ordering the steel pin.

[mrgizmo04]

I was just worried that it would introduce noise and clunks at low speeds. The dual mass flywheel does enough of that already. Seems like this is not the case though, so I ended up ordering the steel pin.

There is no clunking because the fork is attached to the pin via a spring clip and the two surfaces are in constant contact, plus you grease the mating surfaces.

If your flywheel is making noise (especially apparent when shutting the car down), might be time to replace.

[Obioban]

General comment on nvh that was mentioned earlier specific to the metal pins - with everyone running straight pipes, solid bushings, airboxes, nvh from the pin should be the last thing on your mind, lol.

Since I'm the one that made that comment, I suppose I should point out that I'm running the SS street muffler (quieter than stock), resonators, cats, and oversized pipes (quieter than stock). Airbox is quiet at low throttle levels, drivetrain mounts (which are responsible for most bushing based NHV) are all stock, and the monoballs I do have are poly isolated :P

[kaiv]

My factory pivot pin was plastic and wasn't half bad when I replaced it with a new plastic pivot pin.

I meant the factory metal pin.

The E46 M3 factory pin is plastic and they do fail.

[kaiv]

Yeah, it's a close call for me-- close enough that I have a BMW metal pivot pin on the shelf that I opted not to install, but also didn't get rid of

It's basically comes down to the slight chance of a failure from the plastic one vs the guaranteed but pretty insignificant NHV increase from the metal one. I end up on new plastic, but I wouldn't fault anyone for going the other way.

... but definitely not brass.

Part that can fail vs part that can't. To me it's a no brainer!

I never noticed any NVH increase, and it is a stock piece on the 8 series...

It is very faint. A lot of people don't notice.

[heinzboehmer]

There is no clunking because the fork is attached to the pin via a spring clip and the two surfaces are in constant contact, plus you grease the mating surfaces.

If your flywheel is making noise (especially apparent when shutting the car down), might be time to replace.

Yeah my flywheel makes a ton of noise when shutting the car down and when pressing the clutch in quickly at low speeds. New one is on the way with the rest of the parts I ordered.