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Opposite Lock: The Origami M3

BMW M3, Featured Posts, Interesting | November 15th, 2011 by 10
Formula One World Championship

What do you get when you take an inline six, fold it in half, and then spread the cylinder heads? I’ll give you a hint: …

What do you get when you take an inline six, fold it in half, and then spread the cylinder heads? I’ll give you a hint: it rhymes with “G-Fix.” A wave of speculation has risen in recent weeks, leaving many to believe that the next generation M3 will feature a V6 engine. Today, Opposite Lock takes a look at the controversy – and takes a controversial stand.

Like double-round headlamps, kidney grills, and Hofmeister kinks – inline six engines are synonymous with the brand. In fact, while BMW has long made V8s, V12s, and inline 4s – the inline 6 has always held a romantic office. Like the famed boxer twins of Motorrad, inline sixes are what first come to mind when looking at the elongated hoods of BMW cars. At a spiritual level, these engines are inseparable from the roundel.


It comes as no surprise then, that the BMW loyal are losing sleep over rumored V6 engines finding shelter under the hoods of future BMWs. The M3 is in many ways a halo car for the brand – so opening its hood to find a V6 underneath represents the greatest departure from tradition that BMW could possibly mount.

I am a traditionalist to the core, and trust me, it pains me to see the demise of the inline 6 M3. Of course, this pain has faded somewhat over the last 6 years wherein the M3 has been powered by a V8 – and a fabulous V8, mind you. Couple that with the fact that the first M3 featured an inline 4, and suddenly I6 reverence can seem a little unfounded – at least when it comes to what’s powering the M3.

Form must follow function. This doesn’t just apply to aero. To push the boundaries of what is possible (read: progress) and to achieve new possibilities through engineering, sometimes changes come as revolutions – not evolutions. There are many benefits to developing a V6 unit, and they must be weighed against the benefits of inline 6 design. “Form follows function” is a mantra I hold very close to my heart. It’s why I donned a dorky swim cap when contesting a triathlon. It’s why I insist on loading the toilet paper roll with the paper falling to the outside, not the inside of the dispenser. It’s also why I reserve a special hatred for fake air intakes used for aesthetic purposes only. If a design offends tradition but enhances function – all the power to it. “Bring it on,” I say.

The inline 6 engine layout is inherently the most balanced configuration possible, with reciprocating masses nicely cancelled out. These engines truly are, “silky smooth.” For this reason, they have long been chosen for large commercial applications, for example, most highway semi-trucks feature large diesel inline sixes. Naturally, in performance applications, this also lends itself to higher rev capabilities before grenading. The biggest draw back in the context of performance would be the length and height of an inline 6 engine. Obviously, standing the cylinders up vertically, and in the longest line possible, is not conducive to a low center of gravity, nor is it conducive to enhancing the front to rear weight bias of the car.

The V6 engine layout is not one of prestige – but it is one of function, particularly if coupled with BMW’s new cross-bank cylinder manifold technology. As in the S63 M engine, the turbos would be housed within the ‘V’ of the cylinder banks, thus making the engine incredibly compact. The blades of the turbines would be placed very close to the exhaust valves, thus decreasing lag. Also of benefit, the engine becomes slightly squatter with a lower center of gravity, and nearly half the length of the block can be eliminated, lending to better weight distribution and more nimble handling.

There are two paths to take with the V6 engine, utilizing either a more balanced 60 degree angle – allowing a 120 degree firing order – or utilizing the much rougher 90 degree design, which both feels, and sounds, less refined. The problem I see with BMW utilizing a 60 degree V design, is that it may not allow enough room to house the turbos within the V-bank. This could largely undo the argument for V6 implementation, since it likely hinges on the capitalization of a similar plumbing layout to the S63 V8 unit. Rumor has it that the M division has thus far been unable to smooth out the V6 concept engine to an acceptable level, and this also hints at a 90 degree V bank starting point. Of course, the biggest improvement expected from a turbo charged V6 design would come in the name of efficiency – with a likely target of a 30% decrease in fuel consumption. If the new M3 can offer increased performance with significantly less consumption and pollution, a good case will have been made for the controversial move to a V6.

On the topic of prestige, Formula 1 will be adopting turbo charged V6 engines in 2014. When it comes to engineering prestige, it’s tough to top the glamor of F1. An added benefit to V6 engines is found in that this configuration allows the engine to remain a stressed member – useful in such extreme performance applications.


Honda F1 Turbo V6 raced until 1988

Many among us still bemoan the move from high-rev naturally aspirated engines to the turbo units of today – and tomorrow. Those of us who have recently experienced the best BMW has to offer on the table of M design, however, are looking on the bright side. No, the new S63tu, as found in the F10 M5, does not rev to the stratosphere – and I lament this fact. But it does have a powerband spread from Monday to Sunday – and so much torque at the ready that the M5 is constantly fighting for grip. It is a magnificent car, and it is special because of its turbo engine – not despite it. The case in point: sometimes, progress is disguised as heresy, and embracing it – though difficult at first – is thrilling.

At this point, only a few well placed individuals know the fate of the next M3’s engine design. Should it be a V6 when finally released, I for one will not be found sitting on my couch sulking. I will more likely be found sitting behind the wheel, counter steering through a corner. Revolution can be a lot of fun, after all.

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  • Xcoreflyup

    no sorry, there are things that should and should not be changed nor going into revolution, and the configuration of a inline-6 engine is the one which should not be change. it’s not just an traditional, it’s something that true bmw enthusiastic and bmw itself should be proud of. proud of that fact bmw and its original idea, the idea that bmw hold on to, could withstand the trial of time and the challenges from all around the world including economy.I couldn’t care-less when i heard other people say bmw is boring babrabbab…bmw never changed,,,,,,the truth is they dont know what a ultimate driving machine is like………

    • LaMa

      yes, they all said the same thing about the diesels, and now 60% of BMW’s sold in Europe are diesels. Then the trucks. X5 came and won. Then they said the same about the missing 6 spd manual which went kaput in Europe from the M5 M6.
      Then the //M trucks ! what horror ! X5M and X6M came by and made a bunch of money. X3 will come in due time. Now its the I6 being dropped for a V6.
      Let me tell you an another thing which this article misses, there may not even be an M3 any more ! It will be called M4 as the coupe will take on the #4 designation and if BMW decides not to build a sedan M then it will be no more M3.
      Will the world still spin around ? yes.

      there are millions of things more important then these details. BMW is a company who is out there to make money. Shareholders dictate more then you think.  Do they care if the next M3 has a 3 cylinder diesel engine ? Not if they sell with a huge profit. and sell they will with profit never been seen before.

      • Xcoreflyup

        businessman vs car guy……should we keep this going?…when car guy was in charge of bmw. BMW dont have these:
        turbocharger failed on a f10 with 7800 mile on the clock
        problem that last a whole lot 4 years and still have offer officel fix, HPFP…would i still recommend getting a used bmw with a N54?
        PS: these r all first hand info. i personally see the vehicle came in for repair
        now should we let the Shareholders take charge? 

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  • Bry

    If there’s one company in the world that can produce a refined V6 engine, it’s BMW. I really like the “form follows function” theme of the article and I completely agree. I’m almost always impressed by BMW engineering and I have no doubts that they can produce a V6 turbo that works. Not only that, but it would be great for BMW Motorsport to see how the engine works on the street if they ever decide to get back into Formula 1 and use it there.

    • Mose121

      Unfortunately, F1 is a total waste of money these days.  Unless you can throw away hundreds of millions of dollars to actually be a contender, it’s a ridiculous thing to get involved in.  All of the advanced tech that was once only used in F1 is now implemented in most of the top motorsports arena’s today.  10-20 years ago a touring car would never approach anywhere near what it costs to build a competitive touring car today.  All of the same design principles right down to the aero/wind tunnel work is done in exactly the same manner now.  The ALMS/LMS/DTM will provide plenty of technology for street car implementation at a fraction of the cost.  Plus you don’t have to pay the Ecclestone tax.

  • Malosmani92

    The M3 is probably one of the best handling cars in the world. Aside from that it always used to have near perfect weight distribution and the smoothest engines in the world. Performance wise you can get 450hp fairly easy from a turbocharged inline 6 anytime any day anywhere and even efficient at that. So what’s the point of a V6 then? Im strongly against a f**cked up sounding v6.. Inline 6 is the way bmw should go about this

  • http://streammoviesfree.net/ movies

    This car looks amazing

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  • Mose121

    “If the new M3 can offer increased performance with significantly less consumption and pollution, a good case will have been made for the controversial move to a V6.”

    I don’t give a damn about less consumption and pollution on a high performance car.  Better MPG can be easily achieved by improving on the I6 design, and with the potential that was in the N54 engine there is absolutely no reason why a change to a V6 is necessary.  The only reason that would make any sense is if they wanted to work on a front wheel drive platform, which again is sacrilege when talking about BMW’s and should never be considered.  In a world where hybrid owners get tax breaks and special lanes to drive in despite their cars actually being worse for the planet over their entire lifecycle, and current board members who don’t give a damn about their brands history and just want to shoot for mass appeal it doesn’t surprise me that BMW just doesn’t give a damn about what a BMW once was and what it is supposed to be.  Get it together BMW, stop catering to people who want products like a Lexus.  You were once the best manufacturer in the premium sports car market, now you are turning into a mediocre luxury car maker.  You don’t belong in that segment.  There’s something to be said for making the best product in your segment and not building the same cars everyone else is already making.  Listen to what the engineers tell you and even if it costs a few more $$$ do it anyways.  Stop hancuffing them and get back to doing what you do best, building premium sports cars. 

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