BMW showcased its next-generation 2.0 litre four-cylinder turbo engine at the BMW EfficientDynamics Innovation Days this month. The new engine is codenamed the B48, while the earlier-unveiled three-cylinder engine is called the B38. Both engines made their debut in front-wheel drive form in the F56 MINI as well as the BMW 2 Series Active Tourer.
The new engine has a longer stroke and a reduced bore. It has a bore and stroke of 82 mm by 94.6 mm, and a displacement of 1,998 cc, as opposed to the outgoing 2.0 litre N20 engine‘s 84 mm by 90.1 mm bore and stroke and 1,997 cc displacement.
When we were briefed on the new engine in 2012, we were told that output targets were 40-67 hp and 60-90 Nm of torque per 500 cc cylinder for petrol engines and 27-60 hp and 75-100 Nm of torque per 500 cc cylinder for diesel engines.
This would make a 2.0 litre four-cylinder petrol engine’s output to be 160-268 hp and 240-360 Nm based on those numbers. The existing N20B28 already does 240 hp and 350 Nm of twist.
This year’s presentation reveals different output numbers. BMW’s new estimated output numbers for the B48 engine is 181-255 hp and 330-400 Nm. So we can expect the F30 328i LCI to do 255 hp and 400 Nm, up from the existing numbers. Installed in the new MINI Cooper S, the new engine produces 192 hp and 280 Nm of torque, with a 300 Nm overboost.
As for diesel, the new engine family’s 2.0 litre oil burner will do 148-188 hp and 330-400 Nm of torque – not a big improvement in terms of peak output figures from the existing engine in models like the 320d.
We’ve already tried out the three-cylinder B38 in prototype form – read our previous story for our brief test drive impressions of the engine installed in a 1 Series hatchback, and for more details on the new engine family. Our man Jonathan James Tan is on his way back from testing the new MINI in Puerto Rico so we’ll be able to read his impressions of the new engine in the new MINI too.