Lightweight Flywheel Chatter - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Cloudsurfer · 08-01-2007, 09:18 PM

I've heard this is normal from a few people, but I don't really understand why it would be. The flywheel is bolted to the engine, and simply spins with the crankshaft, so I don't see why you'd have chatter from it being single vs dual mass.

Patrick

Rodger · 08-02-2007, 01:23 AM

Maybe it chaters because of the lack of springs, as in the dual mass flywheel? I would suspect the dual mass is quite a bit better a dampening any chatter, whereas the solid (it is solid, right?) light flywheel has no chatter dampening.

skip_168 · 08-02-2007, 04:56 AM

Quote:

Originally Posted by Schnell!

Maybe it chaters because of the lack of springs, as in the dual mass flywheel? I would suspect the dual mass is quite a bit better a dampening any chatter, whereas the solid (it is solid, right?) light flywheel has no chatter dampening.

The alu. flywheel is a solid mass,(well aluminum with a steel plate where the clutch contacts it..), If that was going to make noise, sumtin' might be loose...

Cloudsurfer · 08-02-2007, 10:26 AM

Exactly. It is solid (alu with steel friction surface), which is bolted to the engine, which all spins as one unit..... so I still don't see why it would chatter, even though I've heard from several that this just comes with the territory....

Patrick

skip_168 · 08-02-2007, 11:02 AM

Quote:

Originally Posted by bmwm750

Exactly. It is solid (alu with steel friction surface), which is bolted to the engine, which all spins as one unit..... so I still don't see why it would chatter, even though I've heard from several that this just comes with the territory....

Patrick

if everything is tight on the flywheel, the noise most likly is coming from the clutch disk or pressure plate....

pecivil · 08-02-2007, 11:45 AM

I have the aasco fly and it has chattered fron day1. I also had clutch done, with new everything when it went in. My porsche mech who did it told me it would chatter before he did it. What exactly makes the noise he was not sure about. He said it is much better in boxsters than in 996's. In a 996 the transmission is between you and the engine, and in the box, the engine is between you and the tranny, this was his reason. My chatter is only noticable stopped at idle, you can hear it, but it isnt what I would call loud. But any "car guy" standing next to the car would immediately know something is up.

I did get a chance to hear a 996 with one in his shop, and it is MUCH louder inside the car than in the box.

I also know that in BMWs with lt wt flys there is chatter. I think it is just inherent to lt wt flys bolted onto cars designed for dual mass flys.

pecivil · 08-02-2007, 11:48 AM

also, I am pretty sure the reason the manufacturers went to dual mass flywheels in the first place was for smoothness and to reduce vibrations in the drivetrain from the drivers perspective. I think Porsche started using them on the 964 and 968.