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Cookie Porsche's Avatar
 
Join Date: Jan 2005
Location: Darkest Africa
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Vibration Damper and L/W Flywheel (993)

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
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Old 02-22-2006, 09:28 PM
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Tom,
Check the post "New problem with 3.6 case" on this page. Lots of great info.
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'76 911S 2.7, webers, solex cams, JE pistons, '74 exhaust, 23 & 28 torsion bars, 930 calipers & rotors, Hoosiers on 8's & 9's.
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Old 02-22-2006, 09:43 PM
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A case of premature posting... Just read that thread and you're right - good info.

Tom
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Old 02-22-2006, 10:04 PM
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Quote:
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)

Quote:
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
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Old 02-23-2006, 02:20 PM
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