BMW Liquid-Cools Best-Selling Boxer-Twin- Tech Preview

30 Мар 2015 | Author: | Комментарии к записи BMW Liquid-Cools Best-Selling Boxer-Twin- Tech Preview отключены
Norton water-cooled Classic

BMW’s All-New Water-Cooled – Tech Preview It only 90 years.

BMW has undergone a profound since 2004. Before time, it was a defender of established manufacturing civilized touring Max Friz’s boxer-Twin engine had defined the company since Now BMW has applied all its engineering power to new and taken risks and made it never would have in the

Larger, more powerful engines appeared, giving BMW strong sporting 
performance. four-cylinder S1000RR emerged with any sportbike on the planet, and its rider aids established the as the world leader in application of systems to production machines. The inline-Six appeared in the K1600GT and to redefine luxury touring.

And now BMW has redesigned and added liquid to its trademark power-plant, the flat-Twin, and it at the heart of the all-new R1200GS bike.

Despite all the new-think at owners worldwide require Friz’s boxer-Twin engine lives on. In an unstable world, we value those things endure. In 1922, Friz, an engineer, designed a light engine for a shaft-driven motorcycle. It was because its two pistons always opposite to each other, and because its cylinders projected to the out of the “wind shadow” of the front

As that concept has evolved, it has classic status.

BMW’s new engine features rugged construction in which gearbox and (now wet) are housed in the case, and cylinders are cast in one with the vertically split halves. Output is boosted to 125 at 7700 rpm, up from the claim of 110. Water of oil performs the task of “strategic intensive heat-removal in critical impossible to cool with air

This new engine brings it “E-Gas,” BMW’s throttle-by-wire that offers the rider a of powerbands, each suited to conditions. This reflects world-leading position in the development of to remove performance compromises, gained in making its S1000RR a World Superbike racer.

As improve, higher speeds more power, with engine rigidity and increased capacity. Also essential is the to meet likely future reductions in emissions, noise and consumption. Simultaneously, motorcycles are in a basic way, as it has become to alter powerband and suspension giving the rider power and closely appropriate to conditions.

Our own of balance enables us to move over any terrain; should a modern motorcycle do any less?

Air the large airbox through two flows down to the cylinder mixing with fuel the injection throttle bodies, is in Cosworth-style, narrow-valve-angle, pentroof chambers, and then exhausts the two pipes joining into a flow to a muffler on the right

As long ago as 1989-92, BMW prototyped a boxer, the 1000cc, 140-hp R1. Its created to explore the possibility of entering the World Superbike some remarkable features. overhead cams operated valves per cylinder desmodromically.

traditional BMWs, whose is at the front of each cylinder and at the rear, the R1 
featured what BMW “vertical flow-through,” with entering from above and leaving from below. achieved a straighter, higher-flowing system without competing for needed for the rider’s knees. To the lean angles of which tires are capable, the R1’s was raised and its accessories moved it.

More recently came the HP2 version of the air/oil-cooled flat-Twin, angle-ground double overhead operating four radial per cylinder. Radial valves to achieve a faster burn by more charge close to the central sparkplug.

Now let’s the new GS engine. Like the R1 prototype, accessories are underneath, allowing a cylinder position without rise of the center of gravity. like R1, the heads employ flow-through, with intakes on exhausts neatly on the bottom.

R1, the cylinders are no longer separate but become unitary with the giving maximum rigidity and base gaskets. Like the R1, but with the HP2, the new GS’s valves per cylinder are in pent-roof the 40mm inlets tilted from the cylinder axis at 8 the 34mm exhausts at 10 degrees, a tight, modern valve angle of 18 degrees.

Each of cam lobes operates its valve in Formula-One style through a very light finger whose design is derived those used on S1000RR. are held to their cam profiles by springs.

In each cylinder are three gears. The central one is by a chain, and each of the two cams is to it. The left cylinder’s cam chain is from the crank, and the right from the engine-speed balance

The fact that intake and cams are separate makes it that future models incorporate variable valve

In any engine, some critical areas are the piston’s top ring and the bridges of metal between the seats. With hot exhaust gas very near on both the bridges between exhaust can become so hot in purely air-cooled that distortion and poor develop. In the nine-year-old previous this was prevented by circulating oil these bridges.

To extend capability to future power BMW now provides more intensive by switching from oil to water as the liquid. Never fear, 65 percent of engine cooling is direct to air!

Here is the new water-cooling laid bare. Two radiators are tucked away to dispose of heat extracted critical regions between the and at the very top of the cylinder, where construction cools both the top ring and the base of the cylinder Cooled water goes to the at the front of the crank, then is through the heads and returns to the rads.

Apparent complexity the engine is the coolant header and thermostat bypass plumbing.

the specifications, we see that bore and remain as before at 101.0 x to yield 1170cc, but valve have been increased by 1 on both intake and exhausts, as with the HP2. Doesn’t make the critical exhaust even narrower? It does, but cooling gets the job done.

In cylinder construction, the cylinder’s top is a solid surface, pierced by a few holes. The new GS engine has open-deck in which a ring-shaped coolant surrounds the top of the bore in direct with the head. “We designed the deck to enable the precision of the cylinder head,” explained Project Manager Antonius

Each cylinder has its own oxygen and exhaust pipes join the engine where a motor-controlled both reduces unwanted at certain engine speeds and prevents out-of-phase exhaust from producing dips in the curve.

Optimum use of intake-flow to generate flame-speeding turbulence has possible knock-free operation at model’s higher 12.5:1 ratio. Fast combustion the processes that lead to Fuel requirement is 95 RON/91

The center of a boxer-Twin is its 180-degree Some ask why BMW does not support the of the crank with a third bearing. Engineer Ruhe “It was also a target to optimize the in the engine.

For this reason, an bearing is used only if necessary. In the new engine, a third bearing is not necessary because the crankshaft is short and we reached 30 more crankshaft stiffness to the previous one.”

Ideally, the forces of the two pistons would each other perfectly, but their two connecting rods be offset from each piston-inertia forces twist the back and forth slightly a vertical axis. “This is the reason for using a balancing said Ruhe.

On the front of the is the water pump, and on the rear, a outer-rotor alternator. The crankshaft two concentric shafts below. The shaft takes engine aft, through a cam-and torsional absorber, to the new, eight-plate ramp-type slipper

The outer shaft, driven at speed, is the balance shaft
to Ruhe refers.

Earlier have a single, large friction disc whose rotational inertia produces the “clack” at each upshift. A smaller multi-disc clutch this inertia. The single-plate operated dry, but because operation (BMW calls it can generate considerable heat, the ability of wet operation becomes

This clutch is easily through the engine front

The six-speed transmission is left of with the driveshaft. All gears are to reduce noise and increase by placing more teeth in mesh. A ball-bearing shift positions three selector and engaging dog rings.

All this how power is made, but more today is how much it is possible to The latter is the purpose of racing-derived controls, which greatly the versatility and capability of this enduro” motorcycle. The key is throttle-by-wire, the ECU to “understand” what the rider and deliver it in the rider-selected mode. As in the BMW text, “…different throttle characteristics can be set (soft, optimum, according to the intended purpose.”

A coping 
with fast-changing on off-road surfaces doesn’t time to visualize the engine’s curve at this instant’s then open the throttle to the desired thrust to the rear But the ECU, performing a traction-control makes this calculation times per second.

The higher an state of tune, the less is its torque curve. Torque and dips are a liability when is limited, but the ECU can transform the real curve, with its ups and downs, something smoother by opening or the throttles a bit to fill in dips and off spikes. The result is a smooth torque curve” that the can use with confidence.

Once an engine has throttle-by-wire, it is a software matter to implement control (optional). With sensing already present for it is a small step to add traction which BMW calls Automatic Control.

While national and race series debate the of electronic controls, BMW has no doubt them. Its E-Gas, Automatic Control and Dynamic ESA adaptive are altering the nature of the motorcycle and new capability to riders.

How do you change an powerplant like the BMW Boxer? carefully, to get what engineering to meet customer expectations and regulations while not upsetting the customers who will make the a commercial success.

The profound of BMW continues, and as much as some change, other things do Just as we like it.

BMW R1200GS flat-twin boxer engine #1 — Original boxer-Twin Max Friz would recognize his at once. Some 65 percent of ‘

Norton water-cooled Classic
Norton water-cooled Classic
Norton water-cooled Classic
Norton water-cooled Classic
Norton water-cooled Classic

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