BMW Announces Plans for B57 Quad-Turbo Diesel Engine

By Christian Stampfer on 23 May 2016
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MUNICH—At the 37th International Vienna Motor Symposium, BMW announced plans for a new quad-turbo diesel engine.

The new engine, designated B57, will be a 3.0-liter inline 6 turbo-diesel with four turbochargers capable of delivering 394 horsepower and 561 pound-feet of torque, the latter available between 2,000 and 4,000 rpm. The powerful engine will nonetheless be rather fuel efficient. BMW says to expect fuel economy ratings of 41 mpg or 5.7 l/100 km when it appears in the upcoming BMW 750d. The Bavarian automaker also says to expect it to accelerate from zero to 60 mph (96 km/h) in 4.5 seconds, just 0.2 seconds slower than the current 750i that is powered by a gasoline-powered twin-turbo 4.4-liter V-8.

The B57 achieves its power and fuel economy through multistage turbo charging: two low-pressure turbos and two-high pressure turbos provide low-end and high-end torque, respectively, along with better charge-air cooling.

BMW says the engine will meet upcoming European and U.S. pollution standards, which means there is a good chance the engine will be available in the U.S. market as well as in European markets where diesels account for more than half of all new-car registrations.

(Photo: Accura Media Group)