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914World.com _ 914World Garage _ Can a sportomatic tranny handle the higher hp motors?

Posted by: funk Jun 24 2017, 11:47 PM

I know the sporto was made for a 2.0 flat six and I have heard varying reviews to the enjoy ability and more so performance. some saying it made a dud out of certain models?
I know sacrilege to the beast? so it made me thing how a sporto would be to drive with say a 2.7 s all ported out and outperforming any of the stock touring sixes but would you have to heavily modify the tranny and such? This must be where LSD and such come in handy? I have nerve damage in my feet so clutching it is getting painful to say the least?just looking for opinions and knowledge? thanks,Jo

Posted by: funk Jun 25 2017, 12:17 AM

well I just answered my question. I see that there are factory 2.7 s with sportos? but how do they perform? I couldn't find a 3.0 from factory with sportos I think once the 3.0 came out it was a new ball game for the transmissions?

Posted by: Gustl Jun 25 2017, 01:42 AM

The Sportomatic transmission was used from the factory from 1968 up to 1980.
So there are various types that would work with various engines (power).
From my best knowledge, the 925/16 tranny would work with the highest power.

Posted by: flyer86d Jun 25 2017, 03:58 AM

Two PCA members that I knew each had Sportomatic cars with larger engines. One had a 1977 european Carrera 3.0 Sportomatic. He changed the original 3 speed Sportomatic to an earlier 4 speed Sportomatic and autocrossed the car extensively. The other was a member with an early 3 liter 930 that he had changed to a Sportomatic. He tracked the car quite a bit.

Charlie

Posted by: infraredcalvin Jun 25 2017, 10:21 AM

Some good info here:

http://forums.pelicanparts.com/porsche-911-technical-forum/456154-4-speed-925-sportomatic.html

Posted by: stownsen914 Jun 25 2017, 08:21 PM

There are 901-based sportomatics and 915 based sportomatics. I suspect the torque limits would be similar to the trans on which there were based.

There was a guy back in the late 70s or early 80s who raced a sportomatic 911 in IMSA, believe it or not. I guess it can be done.

Scott

Posted by: bdstone914 Jun 26 2017, 06:18 AM

What engine are you running? Why would you want one? They are not popular with 911 guys. They require cooling which is handled through the oil tank on a 6.