964 crank pulley with dampener
03-20-2019, 03:53 PM
#2
Intermediate
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03-20-2019, 09:05 PM
#3
Rennlist Member
I think Rothsport has one too but it may be the Clewett not 100% sure.
03-20-2019, 11:45 PM
#4
Pro
Be aware that the Clewett kit deletes the factory crank pulley and harmonic balancer which some consider to be an issue. There is little in the way of hard statistics to make a determination as to whether removing the harmonic balancer will affect the life of the crank but the factory considered it important enough to engineer it into the car.
That said I have installed the Clewett kit on my car so time, as they say....will tell.
Neil
That said I have installed the Clewett kit on my car so time, as they say....will tell.
Neil
03-21-2019, 07:47 AM
#5
Seared
Rennlist Member
Rennlist Member
Be aware that the Clewett kit deletes the factory crank pulley and harmonic balancer which some consider to be an issue. There is little in the way of hard statistics to make a determination as to whether removing the harmonic balancer will affect the life of the crank but the factory considered it important enough to engineer it into the car.
I installed a Clewett kit on my ‘95 993 four year ago and love it. Bombproof simplicity and top-notch machining & finishing. Since then, I’ve installed five more of these setups on other 993s. Before I purchased my setup, I exchanged numerous emails with Richard Clewett - I’m sure he’d be happy to shed some light on the harmonic balancer question.
Andreas
03-21-2019, 08:28 AM
#6
Pro
There are a couple of threads here on the 964 board regarding the harmonic balancer. The main issue is whether the 964 engine can safely be run without a harmonic balancer. I've fitted the Clewett kit to my car and during the research was unable to find an specific instance of a crank failing because of the balancer. The one on my car was well worn and out of balance and I can't imagine that it was doing a better job of damping out harmonic frequencies than not having one at all. The 993 as you have indicated doesnt need a harmonic balancer so it's a no brainer to fit one of the kits.
Neil
03-21-2019, 09:14 AM
#7
Rennlist Member
I am running one on my 993 engine. The crank has been modified and tolerances tightened considerably on the 993 eliminating the need for the harmonic balancer used on the 964. Without mods to the crank on the 964 I would be concerned especially if you are using a LWF both for the crank the tranny and a multitude of other potential issues. .
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03-21-2019, 11:49 AM
#8
Rennlist Member
I am running one on my 993 engine. The crank has been modified and tolerances tightened considerably on the 993 eliminating the need for the harmonic balancer used on the 964. Without mods to the crank on the 964 I would be concerned especially if you are using a LWF both for the crank the tranny and a multitude of other potential issues. .