YZF R1 – Crossplane X Flatplane

Still today, its just log on to the online motorcycle forums or youtube to see the debates about “the ugly sound of the ‘new’ R1.” And it was clear the disapproval of the majority of users of 1000cc about the noise that the bike brings from the year 2009. (I say was, because the Yamaha YZF R1 returned among the top 10 sport bikes sold). And I, exercising my civic duty, came to say a bit of that bike with “ugly” noise, but that it needs to be really brave to accelerate.

But why the sound has changed ???

It is not only a change of a more acute sound, it is a set of results of a configuration previously unheard in street bikes.

Launched in 2009, the YZF R1 brings the same technology as the Valentino Rossi YZR M1 in MotoGP. But the big differential of this “new” R1 is that, in fact, the model incorporates the same engine architecture used on track bikes (and is not a simply phrase from Yamaha’s marketing department). It is a crankshaft where the configuration was inherited from competition motorcycles, a different arrangement of crankshafts, called “Cross-Plane”. This new technology is in the engine and is called “Big Bang”, that is, a “big explosion”. That’s because the entire engine blast cycle changed, its in-line four cylinders had different blast times, with two cylinders exploding at each cycle (turn of the crankshaft) and in the next cycle the other two.

lijsom4kg4vspuddmp4gThe Big Bang System innovates with the four cylinders exploding in the same cycle, even in misaligned times (different) they have sequential bursts every 90 degrees or ¼ turn of the crankshaft, so the answer in the accelerations is countless times stronger. Another innovation is that the second cycle of the engine turns without explosion, which causes the rear tire to recompose itself giving adhesion and soon in the next “poww”, one more strong explosion. With that changed the riding characteristic completely, and the R1 was born that was elected the bike of the year 2009/2010.

3934083777_e7cd8d0144 Some other changes have also been made to complete this new concept. The new Delta-box frame was also inspired by the Italian rider’s race bike, and received improvements to “support” the more powerful engine. It has strengthened rigidity, ensuring better manoeuvrability, more precision in the bends and stability at high speeds. The rear balance, built asymmetrically, is 30% stiffer than the previous version, and promises to keep the wheel on the ground at the curve outputs. The suspension system has also been redesigned with a new rear shock damper, fully adjustable. At the front, the 43mm diameter upside down fork has gained new adjustments and is firmer. The brakes are also new in this fifth generation. In the front, the wheels came with two discs 310 mm in diameter (10mm smaller than the 2008 version) but with more powerful six-piston radial calipers.

So, laud sound or technology/power?

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