• Feb 18, 2011
BMW X1 2.0-liter turbocharged four-cylinder - Click above for high-res image gallery

We sure hope you BMW fans out there like your four-cylinders with forced induction. According to Autocar, the German automaker has committed to strapping a turbocharger to all of its four-cylinder engines in the near future. The report cites "company sources" as saying that the company plans on using turbo four-pots for applications requiring up to 241 horsepower. Above that magic number, the tried and true inline-six will step in to take over.

Furthermore, each of the company's four-cylinders will all be based on the 2.0-liter aluminum block with different turbochargers and engine management to help crank out different levels of punch. Autocar says the block will use a sprayed-iron liner that's just .3 mm thick instead of the conventional 1.5 mm cast-iron cylinder sleeves for added durability and reduced weight.

Chances are we'll see the first iteration of that lump crop up in the upcoming X1, which Autocar says is set to debut sometime later this week. It will pack the most potent variation of the four-cylinder, though BMW has rated the mill at around 245 horsepower thanks to a twin-scroll turbocharger, variable valve timing and a high-pressure fuel injection system. What's a few ponies among friends?



[Source: AutoCar]


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  • 50 Comments
      • 3 Years Ago
      I'll take this more powerful and more efficient engine over the NA inline 6 any day. I'm wondering what the cost difference will be though....
      • 3 Years Ago
      I assume the inline sixes will all be turbocharged as well? I have not heard much regarding the fate of the N52 NA straight six but I'd like to see it live on in some form or another. It would be a shame to not have an NA straight six anywhere in the BMW lineup.
      • 3 Years Ago
      Looks like the germans need to start asking the koreans....or the japanese....or even the americans how to make a turbo engine

      its a sad day in deutschland
        • 3 Years Ago
        Audi has been making turbocharged engines for years.
      • 3 Years Ago
      I guess CAFE regulations might be responsible for this.
      • 3 Years Ago
      so this is the official BMW excuse for not being able to make as much hp per liter as Hyundai does with the sonata's 2.0 turbo? any thing over 240 some ponies needs to be a v6 huh. ok
      • 3 Years Ago
      I can't see how spraying the iron liners will increase durability. Sure you will save a bit of weight, but it can't be that much. I bet it's just faster and cheaper to use the spray method. Wonder how this would affect rebuildabilty, not that anyone rebuilds engines anymore.
      • 3 Years Ago
      so finally audi is going to have to put the K04 in the damn 2.0tsi to make around 260 in the A4 and play nice with the 3 series

      I would love to own a 3 with a turbo four hope the tuning guys extract the same kind of power the guys tuning VAG are doing now.

      • 3 Years Ago
      4 cylinder turbos are the new black. Every manufacture will have at least one in their lineup.

      And I for one, applaud it. It is the best compromise between weight, power and fuel efficiency.
        • 3 Years Ago
        Exactly. That's why GM developed a 260hp/260tq I4T 5 years ago. Good to know that BMW finally figured it out.
      • 3 Years Ago
      This is awesome news for E30 owners...

      Bye Bye S50 swap.
        Carlos
        • 3 Years Ago
        You read my mind! Not only will this give the E30 a nice boost in power but they will be able to keep the engine a lot closer to the firewall to shift some weight off of the front axle. Plus who doesn't love turbochargers.

        Side note: BMW should replace the N54 in the 1M with this, I'd be okay with a 1 series that weighs 100lbs less and makes 50 less hp while gaining more fun.
        • 3 Years Ago
        How about 200lbs less?

        Anyway, I love this whole Idea, but what's up with the "spray on" cylinder liners? How much boost will this be able to take down the road?
      • 3 Years Ago
      I'm not seeing a 1.5mm thick cast iron liner (that they're avoiding) Anyone else here have a hard time seeing someone perform such a casting? I suppose a spray on liner will work.

      For what it's worth, we love our BMW/PSA developed I4 turbo in our R56 MINI. However at 75k miles, I'm burning a significant amount of oil. I for one, like the ability to rebuild engines, and a .3mm spray liner isn't very promising on that account.
        • 3 Years Ago
        1.5mm is approx. 0.06". For comparison sake, the minimum skin thickness of a 747 Jumbo jet is 0.042". The thinest material used for a structural component on a 747 is 0.016". Having touched and worked directly with material from 0.01" - 0.1", I can say I could see a cast iron sleeve then machined to 0.06" thick. Such a tube would have definate thickess and more than adqeuate wall stiffness for causal handling. (During use, the Aluminum block would provide wall stiffness).
      • 3 Years Ago
      I rather have the extra 2 cylinders rather than a 4cyl turbo.
      Smoother and no lag, period.
      Mileage is the same.
      If this decision is for cos-cutting, BMW is certainly not passing it on to the consumer
        • 3 Years Ago
        The numbers simply do not support what you have stated. The 1-series is actually quicker, faster, and gets better mileage with the 4T. I suggest that you look at the actual performance numbers and mileage figures for yourself before you make such assinine statements.
        • 3 Years Ago
        I would have like to have BMW combine direct injection with Valvetronic in their naturally aspirated engine.
        BMW could get 300hp from circa 3.3 liters 86x94.5mm, with traditional smoothness and aural pleasure.

        This engine is a derivative of the N55, so the cost cutting is on the R&D side.
      • 3 Years Ago
      Got to drive a 4 cylinder loaner BMW over here in Germany while my 128i was in for service, what a unpleasent sounding and running engine it was, compaired to the six cylinder 128 engine.The turbo 4 would be just as nasty. If you afford the BMW you can afford the 2 mile per gallon increase in fuel consumption and not put up with a 4 bangers nastyness.
        • 3 Years Ago
        I assume this is packaging, as in, the BMWs which will be getting the I-4 won't have the space for the I-6 engine.
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