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Clewett Serpentine Fan Belt

 
Old 11-19-2011, 09:05 PM
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Default Clewett Serpentine Fan Belt

Anyone have the Clewett serpentine fan belt set-up installed on their 964?
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Old 11-19-2011, 10:12 PM
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Every year I get close to ordering this setup, and every year I waffle. I think it may happen this winter.

Very similar to the 993 RSR setup and should do away with any shredded v-belt worries for years.


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Old 11-21-2011, 01:46 AM
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Yes, had it in now for about two and a half years without any problems. Put it in right after a bearing failure was causing the fan to rub the housing. Simplifies everything and looks much better too.
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Old 11-22-2011, 07:44 AM
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I thought about it too. However I was wondering if there are any issues losing the harmonic balancer pulley.
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Old 02-04-2012, 01:20 AM
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Originally Posted by Ducks964 View Post
I thought about it too. However I was wondering if there are any issues losing the harmonic balancer pulley.
Anyone have any issues with this setup because of the elimination of the harmonic balancer?
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Old 02-04-2012, 01:27 AM
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Originally Posted by NoEardGoat View Post
Anyone have any issues with this setup because of the elimination of the harmonic balancer?
I may be wrong, but I believe the 964 used a harmonic balancer crank pulley, while the 993 is an all-steel design.

I think this tidbit possibly came from one of my discussions with Richard Clewett.


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Old 02-04-2012, 03:34 PM
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Originally Posted by AOW162435 View Post
I may be wrong, but I believe the 964 used a harmonic balancer crank pulley, while the 993 is an all-steel design.

I think this tidbit possibly came from one of my discussions with Richard Clewett.


Andreas
Andreas,

You are correct.

The Clewett set-up eliminates the harmonic balancer. That is why I posted my thread on the 964 section. I should have been more specific about my concerns with the elimiination of harmonic balancer.

You are good to go on your 993--no harmonic balancer
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Old 02-04-2012, 07:11 PM
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The 964 should have the the harmonic balancer in place. In the long run it's not a good idea to remove it. Even Porsche left in place on the cup-cars and just removed the extra generator belt. The 993 is another story.

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Old 02-05-2012, 10:50 AM
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Ok question begs to be asked then. - since the 993 and 964 are basically the same engine with a few updated changes - WHY does the 964 need the harmonic balance pulley and the 993 doesn't. What is the reason.?.
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Old 02-05-2012, 11:38 AM
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Different crankshaft design. The webs for the 964 were too thin and therefore a crank damper was needed. For the 993 they beefed up the crankshaft and took weight out of other moving parts.
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Old 02-07-2012, 12:10 PM
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Originally Posted by Gus View Post
Ok question begs to be asked then. - since the 993 and 964 are basically the same engine with a few updated changes - WHY does the 964 need the harmonic balance pulley and the 993 doesn't. What is the reason.?.
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Old 05-02-2016, 03:01 AM
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I know this is an old thread but I wanted to see if anyone in the last 4 years using the Clewett serpentine on their 964 has had a problem. Unusual vibrations? Bearing failure? Idling issues? Broken crankshafts? I'm looking for real world experience. I'm well-aware of the harmonic balancer issues and the science behind it, but the argument still seems inconclusive from everything I have read. I haven't seen any negative posts on the Clewett system anywhere online.
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Old 05-03-2016, 05:01 PM
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Originally Posted by apanossi View Post
I know this is an old thread but I wanted to see if anyone in the last 4 years using the Clewett serpentine on their 964 has had a problem. Unusual vibrations? Bearing failure? Idling issues? Broken crankshafts? I'm looking for real world experience. I'm well-aware of the harmonic balancer issues and the science behind it, but the argument still seems inconclusive from everything I have read. I haven't seen any negative posts on the Clewett system anywhere online.
I finally took the plunge and installed the serpentine belt setup last year. Zero regrets. Works perfect, gives sufficient charge at idle, and takes away the possibility of v-belt failure.

I know it's a 993, but see page 2 of this thread for my install:

https://rennlist.com/forums/993-foru...stalled-2.html



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