Vibration Damper and L/W Flywheel (993)

[Cookie Porsche]

We are having an interesting discussion with a customer and I need a little input.

His 993RS is fitted with the non-damper l/w single crank pulley. Before he took delivery the engine was rebuild by Porsche and a l/w flywheel setup (non DMF) was fitted.

The question now is - should one fit a vibration damper pulley on the front of the crank to compensate for the new l/w flywheel setup?

We have several 964/993 engines running the Clubsport type l/w flywheel, and sofar have had no problems.

Would there be a difference btw a road and a pure track setup? i.e. use vibration dampers only for a road engine?

Regards
Tom

[2.7RACER]

Tom,
Check the post "New problem with 3.6 case" on this page. Lots of great info.

[Cookie Porsche]

A case of premature posting... Just read that thread and you're right - good info.

Tom

[Bill Verburg]

The question now is - should one fit a vibration damper pulley on the front of the crank to compensate for the new l/w flywheel setup?

No, they serve unrelated functions, the 964 used a harmonic balancer to address some issues specific to the 964 crank, a 993 does not have those issues.

The dual mass flywheel was intended to address transmission gear rattling issues(as was the original rubber center clutch)

Would there be a difference btw a road and a pure track setup?

no, the difference is between 964 and 993

993 Cup cars did use the harmonic balancer but I believe that was because of production line expediancy related to the early date of their manufacture