Though we have reported on BMW's ongoing development of a three-cylinder engine for upcoming models like the 1 and 3 Series, there just hasn't been much to go on nor have we seen an update in quite some time now. Autocar claims that sources within BMW recently provided more info and said that BMW continues development of the three-cylinder powerplant and that it should make its first appearance in the 1 Series.
The engine is based on BMW's familiar 0.5 liter-per-cylinder design. Therefore, simple math suggests that the three-cylinder powerplant will displace 1.5 liters. According to Autocar's source, the engine is, "not an entry-level unit. It's a serious, refined, sporting engine with great CO2 figures." Though BMW aficionados may worry about vibration and harshness from the three-cylinder design, Autocar's source states that the company has gone to great lengths to quell these potential problems while also noting that the company has extensive three-cylinder experience with motorcycles. We still stick with our last report suggesting that a three-cylinder Bimmer is unlikely to come to the U.S., but hopefully stringent CAFE regulations will convince BMW to prove us wrong.