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-   Porsche 911 Technical Forum (http://forums.pelicanparts.com/porsche-911-technical-forum/)
-   -   Difference between a 1978 and 1981 SC? (http://forums.pelicanparts.com/porsche-911-technical-forum/260829-difference-between-1978-1981-sc.html)

Bill Douglas 01-14-2006 10:18 PM
As far as driving the cars go, you won't notice any difference. they are both excellent.

Bill - 79SC now with 82 engine.

fireant911 01-15-2006 03:50 AM
Quote:
Originally posted by Carl_Boehme
78 & 79s came with rubber clutch plate damping system. These failed regularly at 21-23,000 miles because of hardening due to engine heat. I don't suppose there are any of these in service any more. If the 78 you are looking at still has this clutch plate you are looking at clutch replacement.
Quote:
Originally posted by SoCal911SC
There was no difference. All SC's came stock with the rubber clutch.
I think that Carl_Boehme had it mostly right (at least according to my source) - the 1980 model also had the rubber-centered clutch. The Porsche 911 Red Book 1965-1999 states the following - "1981: 911SC models reverted back to to steel-spring clutches after problems with the rubber-centered units."

SpeedracerIndy 01-15-2006 04:47 AM
Quote:
Originally posted by aigel
Every 911 after 81 has an O2 sensor and none of them had air pumps any more. :) Electronics are what make modern cars last a lot longer.

George
That is true for US spec cars. But 81-83 euro models retained the air pump, no oxy sensor, and no cat cis system. They also retained the larger runners and ports.

Also, my 81 row had a stock spring centered clutch disk when I changed it a year ago.

Although none of these things matter to the original poster since he's changing the engine anyway!

GSpreeman 01-20-2006 05:11 PM
Is the board working?


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