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New BMW 2.0-liter turbocharged four-cylinder for US offers performance of a six

BMW this past week announced the return of a four-cylinder engine to the US BMW line-up for the first time in since 1999 (earlier post), and has now provided a few more details. Like the company’s latest 3.0-liter turbo inline six, the new 2.0-liter engine will combine twin-scroll turbocharging with high-pressure direct-injection and BMW’s VALVETRONIC intake control.

Maximum output of 240 hp (179 kW) is achieved at 5,000 rpm, 1,500 rpm lower than in the normally-aspirated 3.0-liter inline six. The peak torque of 260 lb-ft (353 N·m) comes on stream at 1,250 rpm. That is 30% more torque than the aforementioned inline six, and also peaks 1,500 rpm earlier. The power comes on early and climbs steadily all the way to redline.

The four-cylinder engine with its all-aluminum crankcase is lighter and more compact than a six-cylinder engine of equivalent power. The turbocharger is a twin-scroll system. The exhaust streams leaving the two pairs of cylinders are kept completely separate as they flow through the exhaust manifold and the turbocharger, taking a spiral path to the turbine wheel.

This configuration results in very low exhaust back pressure at low engine rpm, and allows the energy of the exhaust gas pulses to be optimally managed and translated into powerful rotation of the turbine blades, without a delay in throttle response.

The patented BMW VALVETRONIC system with seamlessly variable intake valve lift control dispenses with the throttle valve system typical of conventional engines. Instead, combustion air mass is controlled inside the engine, resulting in much faster response. Pumping losses are kept to a minimum, making the engine more efficient.

The High Precision Injection direct-injection system also helps to improve efficiency. Centrally positioned between the valves, solenoid injectors with a maximum injection pressure of 200 bar (2,900 psi) precisely control the supply of fuel. The fuel is injected very close to the spark plug, resulting in clean and homogeneous combustion.

The cooling effect of the injected fuel also allows for a higher compression ratio than might otherwise be possible. This results in further efficiency improvements.

US-specific model and timing information will follow at a later date, but the engine is promised to arrive in the US later this year.

Comments

ejj

I'm sorry but there is nothing like a big-block V-8 with 350-400 HP...what I'll be buying the rest of my life...unless there is an electric vehicle with the equivalent HP.

Treehugger

eji

you typically reflect the american idiocy that is now sinking like a stone...

GreenPlease

@ejj
I disagree, and I currently own a car with a 6.3liter V8. My prior car had a twin turbo inline six and, to be honest, I preferred the inline 6. The only reason I'm in my current car is for the chasis and its aesthetics.

I really hope BMW puts this new I4 in a 5 series. I'll pick one up in a heartbeat provided I'm not limited to lower level accessories.

Engineer-Poet

The Ecoboost 3.5 liter V6 puts out 365 horsepower and is more efficient than a V8. There is no need for a V8 in anything smaller than a medium-duty truck any more.

HarveyD

ejj must be joking. Recent small 4-cyls are a lot more fuel efficient and as powerful if not more than large V-8s of a few years ago.

Many of us (specially from Texas) would prefer V-12 with 1000+ hp and a 5+ tonnes car.

When and where did we acquire so much non sense?

Is there a low cost cure for it?

ejj

B i g g e r

s t i l l

i s

B E T T E R !

citizen

testosterone is such a funny thing..

3PeaceSweet

It used to be that large displacement engines were needed to get low rpm torque, but now DI, turbo, VVT and electric motors can do the job. If you save weight on the engine you can have a lighter chassis and brakes etc and get a better weight distribution.


This engine would be a good match to the 40kW electric motor / hybrid system detailed here. With a decent battery the car should be able to travel highway speeds on electric power. With that much low end torque the engine could probably turn at less than 2000 rpm on the highway


http://www.greencarcongress.com/2010/02/5hybrid-20100226.html

3PeaceSweet

In fact the engine will be producing nearly 50kW at 1250rpm. Pretty impressive

Treehugger

eji

America think that being the bigger is enough to be the dominant culture and country in the world. No need to educate people since "Bigger is Better " right? but the truth is
1 : America a found bigger than her : China
2 : America is sinking in its fat in its debt and above all in its idiocy

isn't that enough ? don't you think it is time to look elsewhere, to somewhat more refined thinking and lifestyle ?

Rytooling

If you really want a great engine look at the Hyundai Sonata Turbo 4-cyl, it produces more power than a lot of V-6's (274) and has world class efficiency. Why buy a V-8 gas hog?

Arnold

I have a twin cylinder fiat with itunes and earphones.
If anyone is in the market?

fred

GMs LNF engine has been out for 5? years now.

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