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Erik Mckenna's Avatar
 
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Do 1979 930's have the rubber centered clutch ??

from the factory that is....



TIA
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Old 05-21-2007, 05:50 PM
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yes they do
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
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Old 05-21-2007, 06:53 PM
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Yes, Porsche changed to the rubber centered clutch discs on the 3.3 Turbos. They tend to work fine on relatively stock cars, but once the modification bug bites, they don't hold up to the increased power for too long. Age also plays a big factor in their failure.

The good news is, you can swap a rubber centered disc for a 3.0 liter 930 spring centered disc without any modifications.
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1981 930
Old 05-21-2007, 06:59 PM
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I am wondering if I should change the clutch on my 930.. it's a 79 with only 15K on the clock since new... so I am sure it's old and dry!!

What do you guys think,, drive it until I have a problem? or simply replace it?
Thanks guys!

EM
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Old 05-21-2007, 07:36 PM
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If you have the engine dropped anyways, it couldnt hurt. I wouldnt drop the engine just to replace the clutch though, If you start fixing things that arent broke on these cars you wont have any money left for the fun things (turbo, intercooler, exhaust, etc.)
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John A.
1979 Porsche 930: 3.4L, SC cams, Twin plug, Leask WUR, Custom SSI turbo exhaust, Tial WG, K27HFS, and we can't forget the Zork (short lived depending on my homeowners assoc.)
05 Boxster S: For the Track.
06 Dodge Ram 2500 Power Wagon: Tow Vehicle
Old 05-21-2007, 08:21 PM
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Quote:
Originally posted by Erik Mckenna
What do you guys think,, drive it until I have a problem? or simply replace it?
If it aint broke, don't touch it

Seriously, if you are intending to do serious bolt on upgrades and the reliability of the clutch is in question, then it might be worth replacing *if* you are planning an engine drop anyway.

Otherwise just leave it until it starts to exhibit slipage etc...
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Old 05-21-2007, 11:34 PM
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The "rubber" in my '87 gave way with absolutely no warning at 36,000 miles. The car had never been tracked, was babied it's whole life, and had practically zero mods (B&B headers). I nearly over-reved the engine when it happened! I'm told that's one of the issues with the rubber centered disc, it doesn't provide the same wear feedback that a traditional clutch does....it just sort of lets go! BTW, there was plenty of material left on the disc, it was the rubber puck that just ripped!
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Old 05-22-2007, 02:21 AM
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In my history that came with my 3.3 I found some paperwork relating to the clutch failing after the car was only a year or so old. It didn't state what happened but I am guessing the rubber failed.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG.
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1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods.
Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit.

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Old 05-22-2007, 07:48 AM
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ooh.. man you guys give some food for thought.. I may error on the side of safe and just replace the old clutch .. it's better safe than sorry! A clutch package is cheaper than a top end or total rebuild on the 3.3 hahah!

Thanks for the input guys!
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Old 05-22-2007, 10:38 AM
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