BMW will use turbocharged 4-cyl engines for outputs up to 241bhp under the plan

BMW is planning to turbocharge all its future four cylinder petrol engines, according to new information from company sources.

The company will use four cylinder engines for outputs up to 241bhp under the plan. Above that level BMW will use its new-generation straight-six engine.

Read more on BMW's turbocharging plans

All the four cylinder turbocharged engines will be based on the same new-generation 2.0 litre aluminium block, with different power outputs delivered by using two different types of turbocharger and different engine management maps.

The new block gets a new type of cylinder lining, which sees iron sprayed on at a thickness of just 0.3mm, instead of using conventional 1.5mm thick cast iron liners.

The range-topping 241bhp version of the unit, which makes its debut this week in the X1 SUV, gets a double-sided 'twin scroll' turbocharger, double vanos variable valve timing and high pressure (up to 200 bar) fuel injection.

Lower-power versions of the unit will probably get a conventional single turbo.

Compared with the outgoing 2.8-litre six-pot unit, the '28'-badged four-cylinder engine which replaces it, offers a hike in torque from 229lb ft to 258lb ft, a cut in the 0-62mph by 0.7sec to 6.1sec and a reduction in CO2 output from 219g/km to 183g/km.

The new range of turbo fours are expected to debut in the forthcoming new-generation 3-series.

Hilton Holloway

See all the latest BMW reviews, news and video

Add your comment

Log in or register to post comments

Find an Autocar car review

Driven this week

  • First Drive
    27 March 2015
    Lavishly-equipped, rugged-looking Peugeot 508 estate is a pleasant drive, but there are many more recommendable alternatives
  • 308 GT 1.6-litre petrol is priced from £24,095
    First Drive
    27 March 2015
    Peugeot's given the 308 the engine from the 208 GTi 30th and some chassis upgrades; we find out if the changes bring a bit of old-school Peugeot hot-hatch magic to this likeable family hatch.
  • Car review
    26 March 2015
    Does Suzuki's new city runabout have what it takes to succeed?
  • First Drive
    26 March 2015
    Collins Performance has given the Fiesta ST 270bhp and 265lb ft, but has our favourite fast Ford been ruined in the process?
  • First Drive
    26 March 2015
    The Seat Leon X-Perience is the closest thing to an SUV that you can buy with a Seat badge for now, blending estate practicality with off-road ability