Discussion
Had spent the few weeks researching and ordering the correct parts for a LWFW conversion on my 996.1 C2. Had a nightmare week working away in Fez and Pisa so was looking forward to sorting the car out over the weekend and seeing the difference with the new flywheel.
All the parts arrived and I was fortunate that a good friend let me use his facilities on Saturday:
Got the car up on the ramp and dropped the box:
It was at this point I then notice that the ring-gear on the Carrera is mounted engine side on the flywheel and the 964RS one I have as a replacement flywheel (which had been previously installed on a 996 Turbo) has the ring-gear mounted on the clutch/gearbox side. Upon further investigation this was not the only problem: The C2 has 8 mounting bolts and the 964RS/993/Mezgers have 10. The clutch pressure plate mounting holes are also completely different...
Utter pain in the hole
If anyone else is going down this route don't make the same mistake I have done; I have had to remove and refit the clutch/gearbox/flywheel for nothing.
So I now have a Sachs Mezger engine Turbo Clutch pressure plate and release bearing for sale (only covered 1500miles) and a newly skimmed and balanced lightweight single mass flywheel (fits 964/993/996 &997 Mezger engines). Not intended as a for sale thread but if these are of interest to you, you know where I am
All the parts arrived and I was fortunate that a good friend let me use his facilities on Saturday:
Got the car up on the ramp and dropped the box:
It was at this point I then notice that the ring-gear on the Carrera is mounted engine side on the flywheel and the 964RS one I have as a replacement flywheel (which had been previously installed on a 996 Turbo) has the ring-gear mounted on the clutch/gearbox side. Upon further investigation this was not the only problem: The C2 has 8 mounting bolts and the 964RS/993/Mezgers have 10. The clutch pressure plate mounting holes are also completely different...
Utter pain in the hole
If anyone else is going down this route don't make the same mistake I have done; I have had to remove and refit the clutch/gearbox/flywheel for nothing.
So I now have a Sachs Mezger engine Turbo Clutch pressure plate and release bearing for sale (only covered 1500miles) and a newly skimmed and balanced lightweight single mass flywheel (fits 964/993/996 &997 Mezger engines). Not intended as a for sale thread but if these are of interest to you, you know where I am
Pope said:
Where did you research the LWFW mod - the non-GT / NA cars never had it?
I'll save you the faff: For the N/A 996/997 3.4 and 3.6 cars here is your answer:Flywheel: AASCO Aluminum Flywheel - 106411-11 (Carnewal, Cargraphic and FVD Brombacher labelled LWFW are all the AASCO part).
To be used in conjunction with this clutch fiction plate:
Clutch plate: Sachs 881861 999856
Use stock cover and release bearing.
depending on how far you want to go, Steve Smith @ Vibration free can either balance the flywheel as a single item, or can balance the whole flywheel, clutch cover, crank assembly dynamically to smooth out the harmonics. Once done, your engine will spin like a turbine, with a lot less stress going through the bottom end, etc.
I spoke to Hartech, who carried out a full rebuild on my car about 18K miles ago, and they had no real concerns regarding the fitting of the flywheel. I fitted an under-drive pulley yesterday (as a bit of compensation really for not sorting the LWFW 
) and they had greater concerns about this 
There is often a detrimental effect when modding cars but in the case of my 996, I have absolutely zero concerns for the level of tune I am pursuing. In fact I believe the mods I have done, if anything, will improve reliability (light breathing & exhaust mods combined with a Hartech full rebuild with reduction in transmission rotating mass can only be a good thing non.
) and they had greater concerns about this There is often a detrimental effect when modding cars but in the case of my 996, I have absolutely zero concerns for the level of tune I am pursuing. In fact I believe the mods I have done, if anything, will improve reliability (light breathing & exhaust mods combined with a Hartech full rebuild with reduction in transmission rotating mass can only be a good thing non.Edited by Richie200 on Thursday 27th August 20:17
Richie200 said:
I spoke to Hartech, who carried out a full rebuild on my car about 18K miles ago, and they had no real concerns regarding the fitting of the flywheel. I fitted an under-drive pulley yesterday (as a bit of compensation really for not sorting the LWFW ) and they had greater concerns about this There is always an pay-off or detrimental effect when modding cars but in the case of my 996, I have absolutely zero concerns for the level of tune I am pursuing. In fact I believe the mods I have done, if anything, will improve reliability (light breathing, exhaust mods combined with a Hartech full rebuild with reduction in transmission rotating mass can only be a good thing.
Not if your reduction in "transmission rotating mass" is more out of balance than the OEM part, which is possible.... The part may well weigh less, but it could do more harm than good in the long term if not well balanced. ) and they had greater concerns about this There is always an pay-off or detrimental effect when modding cars but in the case of my 996, I have absolutely zero concerns for the level of tune I am pursuing. In fact I believe the mods I have done, if anything, will improve reliability (light breathing, exhaust mods combined with a Hartech full rebuild with reduction in transmission rotating mass can only be a good thing.Slippydiff said:
Hi Richie, sorry to hear you got this far before discovering what Pope has said.
Only 964/993 and 996/997GT2/3//RS and Turbo use the Mezger bolt pattern crank. C2/4 etc use a different bottom end.
Hope you get it sorted, I'm sure you'll appreciate the difference once you have done, those dual mass flywheels weigh a ton ! !
Cheers H, the best way to learn is the hard way;)Only 964/993 and 996/997GT2/3//RS and Turbo use the Mezger bolt pattern crank. C2/4 etc use a different bottom end.
Hope you get it sorted, I'm sure you'll appreciate the difference once you have done, those dual mass flywheels weigh a ton ! !
fergus said:
Not if your reduction in "transmission rotating mass" is more out of balance than the OEM part, which is possible.... The part may well weigh less, but it could do more harm than good in the long term if not well balanced.
Of course; you'd have to be a bit of a t1t to fit an unbalanced flywheel to a performance vehicle that is used as intended. Coming from an Aviation Engineering background I can assure you this little area will not be overlooked 
mikeyr said:
Hope you are feeling a little less peeved by the whole thing today - it's a great car!
Sorry Mike, just back from a week away in le soleil Less peeved yes; still got the nagging feeling that I need to find myself a LWFW that fits as I think it will do wonders for the car.Anyone with a an air-cooled (964 on) or a 996/997 turbo want a fresh skimmed/balanced LWFW please let me know. I only want back what I have paid for it
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