PS122 wrote:
Anyone know if the 924/944 torquetube/transaxle shares a bolt pattern with any other VW or Audi engine (air-cooled or otherwise)?
924's used an Audi 4-cylinder motor, which was the precursor of the 5-cylinder motors Audi used in their passenger cars. The bellhousing used on the 5-cylinder motors also matches many of the the V6 and V8 motors used in Audi's.
Basically, if it can fit into an Audi and bolt to an Audi transaxle, you can make it work. Look at what the Lamborghini and GT40 guys are doing, they are using Audi transaxles with adapter plates.
http://www.lambolounge.com/chassis/transmission/audi-915/index.asp
If you have a bell housing of your own you'd rather use, then the TT has a simple 4-bolt flange at the front that is easily adapted to the back of many different bellhousings. The TT itself is mild steel and easily modified through standard metalworking practices. The central shaft is also steel and could be modified by an axle shop.
The 944 V8 folks use a Camaro or Corvette bellhousing with a shortened TT and a Chrysler or Ford clutch disc. Considering the number of Audi-style transaxles they break, I'd say it works pretty well for them.
http://www.porschehybrids.com/
http://porschehybrids.pbworks.com/