Thu May 01, 2014 5:51 am by gt1cooper
Remember, guys, this game is a tycoon game. They must cater to the things which almost all cars used. Thus, these engines, with such a small market shares, hold little import to the game. Also, I believe it was said it takes several months per new engine added; time which could be better put into more important things. We do not want to add things into the game which will only be useful for a couple of years. Single cylinder engines are not used today in cars; they are obsolete for that purpose. V twins are almost never used in cars, only bikes (which this is not simulating). I2's experience the same issue. I believe the furthest they will go along this line is I3's.
Look at the recent q&a video. Diesels are far more popular in cars than these, and killrob effectively explains why they are a low priority.