(Pictures courtesy of BMW Motorrad.)
Yes, as we had published earlier, BMW Motorrad decided to unveil the R 1250 GS and R 1250 RT even before the Intermot show.
So, what is all the bru-ha-ha with these two bikes, you ask?
The BMW R 1200 GS is simply the world’s best-selling motorcycle and is the cash cow for the Bavarian manufacturer. But other manufacturers are starting to encroach into BMW’s market share and it is time to move the yardstick. The obvious part to start with is obviously the liquid/air-cooled Boxer engine which began production in 2013.
As we had reported earlier, the new 1254cc Boxer is now equipped with Shift Cam, BMW’s variable valve timing apparatus. The powerplant now yields 136 bhp and 143 Nm of torque. 136 bhp is still behind the likes of the 160 bhp KTM 1290 Super Adventure among others, but according to BMW, even 125 bhp was enough.
Anyway, let us get on with a few details of the new models.
(All pictures courtesy of BMW Motorrad.)
It was BMW Motorrad’s worst secret, because the news of a new 1250cc Boxer engine and RT broke out in the open as soon as they started working on the project. Hence probably why BMW decided to roll out the specs and features of the 2019 R 1250 GS and R 1250 RT even before the expected launch at Intermot.
For your information, the German manufacturer has followed their tradition of launching both new GS and RT simultaneously.
We have covered most of the techs of the new 1254cc Boxer with Shift Cam variable valve timing, so far but here is a little bit more about the new engine since the full spec sheets have been released, also.
We have previously shown the illustration of the workings of the new Shift Cam technology, so please click on this link for more information and the video.
BMW R 1250 GS Boxer Engine with “Shift Cam” Technology Illustrated
That is it for now. Check back with us tonight as we take a closer look at both the new models.
It was hotly rumoured that the new 1254cc Boxer engine in the new 2019 BMW R 1250 GS will feature variable valve and cam timing but there was no concrete proof. But now, a promotional video has surfaced online which illustrates the new Boxer engine with “Shift Cam” technology, courtesy of Motocular.com.
The system aims to provide the best acceleration along with high power gains, while maintaining smooth power delivery, and lower fuel consumption as well as exhaust emissions to meet the tough Euro 5 standard.
To achieve those targets, the BMW Shift Cam system is simple, utilizing an intake camshaft with two cam profiles and a mechanical shift gate at one end.
At low engine loads (lower RPMs), the shift gate engages the camshaft and locks the low lift and short duration cam lobes over the finger followers. That way, both intake and exhaust vavles shut quickly for less overlap, promoting low-end torque.
Conversely, at high engine loads (higher RPMs), the shift gate… er… shifts the camshaft to present the high lift and longer duration cam lobes. Consequently, the intake valves shut later for more valve overlap timing, raising the engine’s power output.
It is the best of both worlds. (You may read more about valve overlap in this article.)
The new Boxer is claimed to produce 136 bhp and 143 Nm of torque, up from 125 bhp and 125 Nm of the present 1176cc engine.
Besides seeing how the new engine works, the video also revealed how the 2019 BMW R 1250 GS will look like.
As we have reported earlier, the new engine may also power the entire Boxer-engined line-up. The R 1250 GS and new models should make their first official appearance at the Intermot show in a few weeks’ time.
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