• Sep 28th 2009 at 11:00AM
  • 47

BMW M5 – Click above for high-res image gallery

The straight six in the first BMW M5 supersedans was silky smooth and plenty powerful, but it was getting a bit long-in-the-tooth, so it had to go. It was replaced by the 400 hp V8 in the E39, then later with the fire-breathing V10 in the current M5 (above) that pushed horsepower into the stratosphere, particularly when you activated the 'M' button. That engine remains powerful, but with CO2 concerns, fuel economy standards and the fact that the V10 isn't available in much of anything else in BMW's lineup, it seems like the next-gen M5 will probably find its motive power supplied by a V8 instead. If a V8 is good enough for the Audi RS6 and Cadillac CTS-V, perhaps it's good enough for the BMW M5, too.

We saw speculation about a V8 M5 as far back as May, 2008, and more recent speculation that it was going to be a twin-turbo V10 instead, but now Inside Line is reporting that BMW reps have confirmed that a V8 will indeed be in the next M5's engine bay – although they didn't confirm which one. Most likely, it will be the 4.4-liter turbocharged V8 that first appeared in the X5M and X6M. With 555 horsepower and 500 pound-feet of torque, it falls right in the ballpark with other supersedan outputs. That new powerplant will sit in a new cradle as well, with the all-new 5-Series just months away. Around these parts, we're starting to refer to this next generation M5 as the Goldilocks Edition. Six wasn't enough, ten was too much and eight is just right. Thanks for the tip, Derick!



[Source: Inside Line]


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    • 1 Second Ago
  • 47 Comments
      • 6 Years Ago
      there has been rampant speculation about this for over a year now... If this is confirmation then fine, otherwise this is non news.
      • 6 Years Ago
      "CO2 concerns"...
      hahahhahahaahahahahahahahahahahahahaahaha

      what a joke
      • 6 Years Ago
      V8TT M5 announced, S/C V6 S4 reviewed...good day for cars
      • 6 Years Ago
      Thats not totally correct, the previous M5 had a V8 which was a fun car.
      • 6 Years Ago
      Seems logical. The idea of a V10 sports sedan was one of my main attractions to this car though. Whatever I guess, it's not like I can afford one anyway.
        • 6 Years Ago
        Yeah you're right. You can't argue with an engine change for better performance, but how many V10 sport sedans are out there? The V10 is what really made this car unique compared to the Caddy or Audi.
        • 6 Years Ago
        The number of cylinders means little to me, except in the way it impacts performance, sound, and refinement. If they can get the desired qualities out of a four-cylinder, then that's fine-- nothing special about a V10, V8, etc. Personally I liked the smoothness of the inline 6 better than anything else BMW has put out.
        • 6 Years Ago
        Actually the current S6 is a v10 as well...I am not sure if it comes in stick though. But the current RS6 is a twin turbo v10, which is easily tunable to 700+hp.

        I believe Audi will be going twin turbo v8 with their next gen rs models as well, which will make for some nice competition. BMW's and Audi's turbo v8's will be monsters....With just a software upgrade you should be getting 650hp minimum.
        • 6 Years Ago
        I personally prefer the 555hp/500 lb-ft of torque (most available at 1800rpm IIRC) over the V10 with 500hp/380 lb-ft tq. But that's just me.
      • 6 Years Ago
      I guess the global recession continues...

      I hope Mercedes doesn't get rid of its V12.
        • 6 Years Ago
        @esoterica

        Don't forget the Carrera GT; that V10 sounds incredible.
        • 6 Years Ago
        @ Estoerica......

        and V12's?
        • 6 Years Ago
        Has nothing to do with global recession, has more to do with these engines being unnecessarily large (physically). Difficult to package, DOHC heads already raise the center of gravity in these motors. The eights represents less mass. Less mass contributes to better handling.
        • 6 Years Ago
        And V8's are the second-most inherently balanced engine configuration after the inline 6. V10's are ... not. And the BMW V10 sounds awful. Really actually the only V10 I've heard that sounds good is the one in the Gallardo (and I would assume, by extension, the R8 V10) but its shrieking sound wouldn't be very appropriate in a Jekyll/Hyde sports sedan.
        • 6 Years Ago
        Don't forget the torque!

        The current V10 is less powerful than the Turbo V8 and the Torque is much higher. Seems like a win-win to me...
        • 6 Years Ago
        Hey Dr. Greenthumb, well by your reasoning, why not stick an LS7/LS9 motor in there? It has compact packaging, it's lighter, and lower center of gravity. It's even more reliable. Heck, I don't mind it at all, and I own a BMW. The LS7 has comparable numbers to the motor mentioned in this article. In fact, I want to swap the motor in my 6 series with an LS4, LS7 or LS9.

        • 6 Years Ago
        A cross plane crank V8 is not inherently balanced.
        V12 is the best. There really isn't any synergy with a V16 configuration, and the marginally smoother power delivery is enough to offset reduced power (for same displacement)

        V10 are variable: A 90 degree odd firing version can utilize the same balancing arrangement that V8's use.
        http://www.timberwoof.com/motorcycle/V-TWIN-7.html
        Motorcycle V4 are usually 180 degree crank to have the slight imbalance offset each other.
        The result is an acceptable, because engine is very narrow, side to side moment imbalance. Though Honda does 360 degree crank with balance shafts in the ST1300 (for exhaust scavenging, think of it as two inline2 engines)

        an inline8 has about the same balance as a x-plane V8, but makes crap for power-due to manifolding
        a boxing 8 is as balanced as a balanced cross plane V8 (and still fires LRLLRLRR)
        a flat plane crank V8 with balance shafts is almost as well balanced as a balanced x-plane V8

        Inline 6 > boxing 6 > Vee 6
        • 6 Years Ago
        I liked the V10 in the M5. In my opinion, it sounds really good.
        • 6 Years Ago
        Add two turbos, inter-cooling and associated plumbing, I'm not so sure that there is much of a weight benefit to be gained.
      • 6 Years Ago
      Hey i got a novel idea: How about another 3.5 straight 6 in the M5 and a 2.3 inline 4 in the M3? Both Twin Turbo'd; of course.
      • 6 Years Ago
      Boooo!....Can't they just make the V8 bigger or add a supercharger instead? I just don't care for turbos...
      • 6 Years Ago
      V8's are always better. It's when they go to some limp-wristed twin-turbo V6 that we'll have to worry.
        • 6 Years Ago
        The Nissan GT-R might disagree with that statement.
        • 6 Years Ago
        You do know there is a difference between an I6 and a V6 right?
      • 6 Years Ago
      Who the hell would rather have a n/a V10 than a turbo V8? Think of the tuning possibilities with that turbo. Mark my words, you're going to see guys putting close to 700 hp to the wheels in these cars. Insane.
      • 6 Years Ago
      The 5.7l V10 in the Porsche GT sounds fantastic.

      If BMW switches to a turbo V8, I hope it still tops out above 8K.
      • 6 Years Ago
      bi turbo v8? sounds fine, sounds like audi will return to the previous RS6 forumula as well.
        • 6 Years Ago
        I just call it like audi does, even the tupercharged.
        • 6 Years Ago
        BiTurbo = parallel turbocharging
        Twin Turbo = mostly sequential turbocharging

        Or atleast that's how I remember it....
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