I would like to suggest a really awesome engine, The Wankel. I really like the engine and if there will be a possibility to get it I will buy this game instantly 
What do ya all think?
viewtopic.php?f=15&t=137 States that Rotaries are on the list, but only as a possible expansion down the track, the dev’s have enough on their plate with what they have at the moment and we cant rush them 