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BMW Z4 Roadster
First turbo four model will arrive this fall

Earlier this year, we reported that BMW's normally aspirated inline-6 engines will be ushered out and replaced by a new family of turbocharged four-cylinder engines. BMW today confirmed that four-cylinder power would return to U.S.-bound BMWs after a 10+ year absence. 

The first model to get BMW's new 2.0-liter TwinPower Turbo four-cylinder engine will be the Z4 sDrive28i Roadster (say that five times fast). The engine develops 240 hp and 260 lb-ft of torque (30 percent more torque at 1,500 fewer RPMs than the naturally aspirated 3.0-liter inline-6).

BMW says that the new turbo four will be 20 percent more fuel efficient than the inline-6 when paired with the 8-speed automatic transmission. We're sure that there are fuel efficiency gains to be made with the 6-speed manual transmission as well, but it's likely nowhere near 20 percent (or else BMW would have mentioned it in the press release).

The Z4 sDrive28i Roadster will arrive in showrooms this fall, and the turbo four will likely filter down to other BMW models soon after.



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RE: Nice engine but...
By zzatz on 4/18/2011 7:26:51 PM , Rating: 3
Yes, inline sixes are smooth, as are V12s and boxers. But mileage is more important now.

Taxes based on displacement, common everywhere but the US, encouraged small high-revving engines. The same effect occurs in racing, where displacement limits reward designs that get the most power out of a given displacement.

But the most power per displacement is not the same as the most power per fuel burned. For that, you want fewer but larger cylinders, running at lower speeds and higher boost.


RE: Nice engine but...
By YashBudini on 4/19/2011 12:31:36 AM , Rating: 2
quote:
Taxes based on displacement, common everywhere but the US, encouraged small high-revving engines.

Hence such wonders in the 60's and 70's in Europe of 2 liter 6 cylinder engines. I once saw a Honda motorcycle, a 400cc in-line 4. I always wondered how smooth that ran. The closest we ever got to that was the V30 Magna.

Did Porsche make a 2 liter flat 6 in one of their 914 models decades ago?


RE: Nice engine but...
By Spuke on 4/19/2011 12:57:16 AM , Rating: 2
quote:
Did Porsche make a 2 liter flat 6 in one of their 914 models decades ago?
I believe so. Not to mention, early 911's also had 2.x L flat 6's. I sure would love one of those but the prices are going up and up on them.


RE: Nice engine but...
By YashBudini on 4/19/2011 7:37:06 PM , Rating: 2
RE: Nice engine but...
By Spuke on 4/20/2011 12:12:11 PM , Rating: 2
quote:
And you didn't even ask.
Didn't know there were some out there with actual 911 engines!!! Nice! Thanks for the link.


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