Tag Archives: Big Boxer

BMW reveals R 18 Big Boxer details

Details of the Big Boxer engine in the new BMW R 18 cruiser have finally been revealed in Munich overnight.

The air/oil cooled boxer will have 1802cc of capacity and develop just 67kW (91hp) at 4750rpm, but a whopping 158Nm of peak torque at 3000 revs.

More than 150Nm will be on tap from just 2000 to 4000 revs.

Despite the enormous pulling power, BMW says the “generously sized flywheel mass” will provide “exemplary running smoothness”.

It will idle at a lumpy 950rpm and hit the limiter at a lazy 5750rpm.

However, we still don’t know what the final appearance of the bike will be.

Following two independent custom shop R 18 concepts, BMW Motorrad unveiled their Concept R 18 at the Concorso d’Eleganza Villa d’Este in May 2019 and a second concept, the more modern R 18/2, was unveiled at EICMA earlier this month.

There have also been some spy shots, but not a full reveal which is expected early next year.

Even before a production model R 18 cruiser has rolled out of the Spandau factory gates, BMW Motorrad Australia is taking orders and deposits and has set up a dedicated site.

Big Boxer detailsBMW R 18 Big BoxerBMW R 18 Big Boxer

BMW says the Big Boxer engine will have overhead valves and a separate engine and transmission housing, but otherwise the same structural features of their first boxer which had laterally controlled valves.

It is BMW’s highest-capacity twin-cylinder boxer engine in motorcycle series production.

The Big Boxer weighs a hefty 110.8kg and has a 107.1mm bore and 100mm stroke.

Other features are large ribbed cylinders and heads with a vertically split aluminium engine housing.

Unlike their classic air-cooled two-valve boxer engines, the crankshaft is forged from quenched and tempered steel.

It has an additional main bearing at the centre, which is necessary to prevent “undesirable bending vibrations of the crankshaft”.

Like the crankshaft, the two connecting rods with I-shaft are mounted on plain bearings and are also forged from quenched and tempered steel.

They accommodate cast aluminium pistons with two compression rings and an oil wiper ring. The running surface of the light metal cylinders is coated with NiCaSil.

Lubricating and cooling oil is supplied by a wet sump lubrication system with a two-stage oil pump via sleeve-type chain driven by the crankshaft.

Two camshaftsBMW R 18 Big Boxer

Modern features include four valves, dual ignition, a modern combustion chamber architecture, intake manifold injection and the BMS-O engine management system for optimum torque and to meet Euro emissions targets.

However, it uses the classic OHV configuration for its valve drive of the legendary R 5 to R 51/2 from 70 years ago.

2016 BMW R 5 Hommage
2016 R 5 Hommage concept

As in the historical role model, the two camshafts are positioned to the left and right above the crankshaft in the Big Boxer.

BMW says the advantage of this “twin camshaft boxer” is shorter pushrods which reduces moving masses, minimises deflections and lowers linear expansions for a stiffer valve drive with improved control precision and higher speed stability.

In the traditional BMW Motorrad boxer design, the two pushrods actuate one pushrod per cylinder side for the intake and one for the exhaust side, guided in a sealed pushrod tube on the top of the cylinders. The two intake and exhaust valves in the cylinder head are actuated in pairs via fork toggle levers.

In contrast to today’s widespread engine technology, valve clearance compensation is not effected by means of hydraulic elements, but – as was the case in most classic air-cooled BMW two-valve boxers for decades – via one adjusting screw with one lock nut for each valve.

As was formerly the case in the classic two-valve boxers, valve clearance adjustment (0.2 – 0.3 mm) in the R18 Big Boxer is also quick and easy. The valves are made of steel, with a disc diameter of 41.2mm on the inlet side and 35mm on the outlet side. The valve angle is 21 degrees on the inlet side and 24 degrees on the outlet side.

TransmissionBMW R 18 Big Boxer

It is married to a constant-mesh six-speed transmission and self-reinforcing single-plate dry clutch with anti-hopping function to prevent rear-wheel lock-ups on rapid downshifts.

The transmission is located in a dual-section aluminium housing and is designed as a four-shaft transmission with helical gear pairs.

The gearbox input shaft with lug dampers drives the two gearbox shafts with the gear wheel pairs. An output shaft is provided to bridge the distance and reverse the direction of rotation. A reverse gear is available as an optional extra. This is driven by an intermediate gear and an electric motor and can be shifted manually.

As in all BMW motorcycles with boxer engines, torque is transmitted from the gearbox to the rear wheel in the R 18 via a propeller-shaft or universal-shaft drive with universal joint, shaft and rear-axle drive with bevel and ring gear.

The propeller shaft and universal joint are classically nickel-plated and open, as used by BMW Motorrad in models up to 1955.

A so-called tripoid joint is applied on the gearbox side for length compensation.

Source: MotorbikeWriter.com

BMW Motorrad Concept R18 | Big Boxer Custom

BMW Concept R18 – Big Boxer Custom


BMW Motorrad have unveiled the third custom creation based around the new 1800cc Big Boxer powerplant, this time offering a modern interpretation of the classic 1960s boxer powerplant, alongside an R5 inspired overall theme. The bike was unveiled at the Concorso d’Eleganza Villa d’Este.

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’concept art
Edgar Heinrich – Head of BMW Motorrad Design

“With its clear aesthetics openly on display, the Concept R18 embodies for me what motorcycling, at its core, is really about. It is all about feeling instead of thinking, and not using technology for self-staging, instead giving space for imagination. This concept bike appeals to something deep down – you just want to just get on it and ride off. But when you get off it again, you don’t just put it in the garage and walk away – you turn around again and give it a final parting glance.”

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’
Bart Janssen Groesbeek – Designer

“The biggest challenge in the design is to render everything visible. Every part has a functional purpose. There are not many who would dare to take such an absolutely honest approach.”

The BMW Motorrad Concept R18 features a boxer engine, cradle frame, exposed shaft and drop-shaped fuel tank. Its black paintwork and hand-applied contrast lines are typical design icons of BMW Motorrad classics

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’

Balanced proportions are reminiscent of classics like the BMW R5, and convey – even from a distance – the look that comes about whenever things are consistently reduced to their bare essentials. The frame and tank create a common line all the way from the steering head to the rear wheel hub and lend a somewhat flowing elegance to the side view.

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’

The large spoked rims (21-inch front and 18-inch rear) provide a particular stance and balance around that hulking big-bore power unit.

The heart of the BMW Motorrad Concept R18 is the Big Boxer, a newly designed, two-cylinder 1800cc flat-twin, a layout synonymous with BMW and its history. Its outward appearance is consciously reminiscent of the engines that BMW Motorrad used to build up until the end of the 1960s – but with a considerably bigger displacement and modern air/oil cooling.

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’

The engine block and transmission are made of glass bead-blasted aluminium, providing an ideal stage on which to present the hand-polished aluminium components as well as the belt guard and valve covers.

The engine badge bears the name of the concept bike. In addition, Solex dual carburettors – similar to those used in the famous BMW 2002 sports cars – also hark back to the brand’s history.

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’

A chrome-plated universal shaft connects the back wheel to the drive. There are no further covers anywhere on the motorcycle. Similarly, the electronics of the concept bike are reduced to no more than starter and lights.

As for its colour design, the BMW Motorrad Concept R18 shows itself to be a classic. The theme is typical BMW: the white, hand-applied lines on the fork and fuel tank in combination with the black base colour represent the classic BMW colour theme.

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’

A discreet yellow-gold varnish effect lends the bright twin lines an exclusive touch, and the black effect paintwork on the tank and fork rods similarly reveal, in the best custom style, an unusual depth when the sunlight strikes the large metallic particles in the various layers of the paintwork.

The visual design of the imprinted single leather seat is borrowed from the classics of the 1950s. Reinterpreted and somewhat more comfortable.

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’

The cantilever spring strut is integrated beneath the seat. The graphics of the headlamp design are also reminiscent of the 1950s. The classic U shape of the original glass cover components are now interpreted as LED lamp elements.


Big Boxer Concepts

The BMW Motorrad Concept R18 is the third in-house interpretation of the large-capacity boxer engine to come from BMW Motorrad. Last December the model created by the Japanese customisers, Custom Works Zon was presented at the Yokohama Hot Rod Show, on the basis of this new prototype engine.

BMW Boxer Zon
Yuichi Yoshizawa and Yoshikazu Ueda with the Custom Works Zon

The ‘Departed’ won the biggest accolade of the event, the ’Best of Show Motorcycle’ award, thrilling motorcycle fans with its classic forms, modern production techniques and all manner of manual art and craft in the details.

The next round was the interpretation by Revival Cycles. The customisers from Austin, Texas created a spectacular bike with their ‘Revival Birdcage’ model, an ideal presentation platform for the Big Boxer. The specially developed titanium frame features an unobstructed view of the engine and drive from all angles. This American design created a furore at last month’s Handbuilt Show in Texas.

BMW Cruiser Big Boxer
Revival Cyles showcase the new BMW Big Boxer cruiser engine in their showpiece

Edgar Heinrich – Head of BMW Motorrad Design

“For me, motorcycles like the BMW Motorrad Concept R18 are a response to a growing need among the motorcycling community: instead of technology, the focus here is on simplification, authenticity and transparency. I observe an almost romantic yearning for real mechanical engineering. Our aim with this concept bike is to address this need and turn it into an analogue statement in a digital age. We have a rich history of iconic motorcycles, and they all bear the same design characteristics. We believe that this can still work well together today with the current technology.”

BMW Motorrad Concept R Big Boxer
BMW Concept R18 ‘Big Boxer’

Source: MCNews.com.au

BMW confirm 2020 entry to the cruiser market with Big Boxer

Production BMW Cruiser will be presented in 2020

BMW Cruiser Big Boxer
New BMW Big Boxer to be used in 2020 BMW Cruiser model range

BMW have again chosen to showcase their new retro style Boxer engine, rumoured to be around 1800cc, in partnership with a specialist custom motorcycle builder.

BMW Cruiser Big Boxer
Revival Cyles showcase the new BMW Big Boxer cruiser engine in their showpiece

The collaborative partner for the “The Revival Birdcage”, is Revival Cycles, a Texas based outfit that have previously made some pretty ‘out there’ designs.

BMW Cruiser Big Boxer
Revival Cyles showcase the new BMW Big Boxer cruiser engine in their showpiece

This bike’s purpose in life is essentially to further publicise the new engine and confirm that BMW will enter the cruiser market with OEM models in 2020. It does make quite a statement.

BMW Cruiser Big Boxer
BMW Cruiser Big Boxer

There has already been a lot of speculation about the large-capacity prototype engine that BMW chose to first showcase in another custom build, the “Departed” from custom house Works Zon (Link)

BMW Cruiser Big Boxer
Revival Cyles showcase the new BMW Big Boxer cruiser engine in their showpiece

Both the exterior geometry as well as the visible elements such as the push rods running in chrome-plated protection ducts are reminiscent of the BMW boxer engines that were built in the 1960s. Just that the cubic capacity is now much larger now and modern air-oil cooling is used.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

The exclusive Revival Party on eve of the annually held Handbuilt Show in Austin/Texas was the occasion chosen to reveal the machine.


Timo Resch
BMW Motorrad Vice President Sales and Marketing

“This is the second fascinating custom bike built around the prototype of the new Big Boxer. We will also be soon showing a BMW developed concept bike featuring this engine.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“BMW will present a series production motorcycle with the Big Boxer for the Cruiser segment in the course of 2020.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“Naturally we want to keep growing. One step we will take to do so, certainly in the US market, is to enter the Cruiser segment.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“BMW Motorrad is consistently pursuing its growth strategy with the clear aim of becoming the number one in the Premium Big Bike Segment.”


The frame of the “Revival Birdcage” is made of titanium and was developed by Revival Cycle.


Alan Stulberg, head of Revival Cycles

“This was our first time to build a frame with titanium, that alone was already a significant challenge.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“Regardless, the frame came together very well in the end and we are very pleased with the result as it accomplished the goal of being nearly transparent.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“We wanted to focus attention on the engine and that is precisely what we achieved with this completely unique frame we designed.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“You can easily view the engine and the drivetrain from all angles.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“In addition, almost every single other part on the bike such as handlebars, footrests, shift lever, seat and unique carbon suspension components were all individually crafted.”

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

Alan Stulberg’s team was inspired by Ernst Hennes’ record-setting machines from the late 1920s and early 1930s and said that it took around six months to develop the motorcycle.

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

“We had already dreamed about this bike for years and in December 2018 we received the engine and could finally get to work. I have always been a fan of the boxer engine, but the pure physical size and aesthetic appeal of this prototype really inspired us.”

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

It will be interesting to see how BMW’s own machine will look, and whether, unlike this show pony, it will have reliable functioning brakes!

BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser
BMW Cruiser Big Boxer
Big Boxer for new BMW Cruiser

Source: MCNews.com.au