Hi all. Long time lurker, first time poster.
The rod length to stroke ratio of the stock D24 (and T) is only 1.57 to 1. The con rod length is only 136mm (5.36"). These numbers are already about as low as you would want them. When VW created the 1.9 diesel they bumped those numbers up to 1.80 to 1 and 172mm (6.78") respectively. They raised the deck height to achieve this and the stroke still didn't reach 100mm! (It only reached 95.5mm). They chose to increase the bore a bit more (to 79.5mm from 76.5mm) rather than making the stroke any longer than that already too long 95.5mm. The point is that unless there is a 6 cylinder version of the 1.9 (which would be a 2.85L), this mystery engine didn't happen. Too bad too because that would be a sweet engine.
http://books.google.com/books?id=bE1...age&q=&f=false
http://www.not2fast.com/vw/stuff/vw_engines.shtml
Regards, Eric