Light flywheel 'rattle" question

[dr914jr]

Thanks Brad..DR914.

Easy now. That title is taken by a well know fellow in Hotlanta :) I claim to know nothing. Easier coming off as dumb than smart :)

B

I'm just doing my best to follow in the masters footsteps. ;) I had no idea one person could store so much Porsche knowledge but I'm happy he's willing to share it.

[Brad Roberts]

Yep :) He has done a lot for the 914 aftermarket. Ask him one day how he funded his GT flares for the 914's.

B

[KevinMac]

As far as transmission lube i just did mine and used RedLine 75-90 MTS which does not have the limitied slip fricton modifier. I will say the shifting has improved. Since I don't have LS, the lack of friction modifier allows the synchros to stop qucker. If you do have LS use any synthetic with the LS friciton modifier already in it! Most do!

[tholyoak]

I'll add my $0.02

All Porsches up until the 964 came with single mass flywheels with no issues. Porsche has added dual mass flywheels for the luxury segment their cars are now aimed at to reduce noise and the ease of driving. See the LUK website if you don't want to take my word for it.

The issues people have with adding a LWF to the newer cars stems from using a standard, non-sprung disk with the LWF rather than a correct sprung hub disk like every car, including Porsche has when it has a solid flywheel from the factory.

The real issue is not the noise, it is simply the audible sign there is an issue. The issue at hand is there needs to be some sort of system in the to take up the drivetrain shock upon engagement. Eliminating the dual mass flywheel and the sprung disk as most people seem to do when converting to a LWF will eventually lead to increased driveline stress and most likely premature failure of directly coupled components.

-Todd

[fpb111]

I'll through my 2 cents in on this. I'd say all of those early single mass flywheels had no trans rattle at idle; as long the 5 lb chunk of rubber bonded between the clutch disk and splines had not disintegrated. After that they were usually replaced with a spring centered disk. Then you could hear the trans rattle at idle with the clutch engaged.

At least that is the way my 1970 2.2S E/W 901 trans, 1972 2.4 E/W early 915 trans and 1978 3.0 E/W 915 trans were with a spring centered clutch disk. The 1978 was the one with the disintegrated rubber center and had the most noticeable rattle after the swap. Not sure if the other two ever had rubber damped disks. They did not when I bought them.

[Brad Roberts]

All correct!!

Cool part: we now have a 6 spring centered SACHS disc to match up to our LWFW :)

And the stocker!

B

[BTERRY1]

reviving this really old thread.  would be interested to know what tranny fluid would quiet things down the best.  I love my LWFW and don't mind the rattle, but in the summer months with the AC on the rattle is even louder with the slight change in RPMs.  sounds like i am pulling up to a tractor pull.