Description:

What with the Porsche flat-six already taken place in the car, BMW is now preparing for the two-cylinder, the R-series is that the switch from air to water cooling. This is how the new drive look like a motorcycle and in detail.


At present, multiply the first time evidence that the water is closer boxer before, as previously thought. He is certainly not in this and also not presented in the next year, not the air-cooled engine in 2013, probably abandoned. But the BMW engineers are working diligently on the first series of water boxer’s history, because there can be no doubt. The graphic virtuosity and a profound technical understanding of power to help Stefan MOTORCYCLE process of this data at visible and understandable, almost animated technology to implement. Power, for decades a popular designer, has built-in “his” water boxer also immediately in a complete motorcycle, according to BMW-habit first in a new GS. This is useful because the design of such an engine brings some design changes, not only because of the placement of the new cooling system.

By switching to water cooling it is in fact the first time to the intake port flow directly from the top of the cylinder head, to let emerge the outlet directly to the bottom. This arrangement would in an air-cooled engine, the rear exhaust expelled into the wind shadow and exposed to hostile high temperatures. And the alternatives – either only two valves per combustion chamber or a three-valve engine with two intake valves and an outlet – not enough to promise performance. For bringing a lot more than the current DOHC Boxer, a complete redesign already, and is good in the GS, RT and R version for strong torque fed 110 HP, in the sharp version of the HP2 Sport, it provides even 133 hp. At this level, but under more stringent emission and noise standards and cost-effective high-volume machining the cylinder heads must set up a water boxer. The HP2-Sport engine needs for more expensive CNC-machined inlet ports and combustion chambers.

It can be more leeway on the cooling and intake air. And yet another advantage over the current boxers kills 90 degrees offset inlet tract. The timing chain must not adventurous turns of a long inlet channel to go round, as is the case in today’s Boxer. Instead, they can drive a gear with only two deflections, which in turn rotates the two camshafts per cylinder head. This gear would with conventional flow through the cylinder head from back to front, transverse rotating in the inlet channel – an impossible solution.