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Behind Closed Doors: BMW’s hidden supercharged WR 750

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Behind Closed Doors: BMW’s hidden supercharged WR 750 Behind Closed Doors: BMW’s hidden supercharged WR 750

Behind Closed Doors: BMW’s hidden supercharged WR 750






The BMW Museum is the first port of call for any petrolhead visiting Munich. But there’s an even more extraordinary collection of machinery just down the road, at the BMW Group Classic headquarters.
Set inside the original Bayerische Motoren Werke factory, BMW Group Classic houses offices, archives, conference rooms and a café. But it’s also home to a small gathering of rare and vintage BMW motorcycles and cars, and a couple of laboratory-level workshops.

Access to this remarkable hoard is by special appointment only?but on this day we had one such appointment. And it was during a behind-the-scenes tour that I stumbled upon this vintage beauty.
To be honest, at first I had no idea what I was looking at. So our guide graciously explained the history of the supercharged 1929 BMW WR 750 Kompressor. Then he threw in a plot twist: this isn’t a restored WR 750, but a complete nuts and bolts replica.

It’s been executed so well, even an expert would find it virtually impossible to tell it apart from the real deal.
The WR stands for Werksrennmotorräder (works race bike), which is exactly what the WR 750 was. It was a technological tour-de-force, built to take on speed records and racing championships. They got the former right; Ernst Jakob Henne set a land speed record of 134.68 mph on a WR 750 in 1929.

The WR 750 had a 750 cc four stroke flat twin with overhead valves, a supercharger wedged between the seat and gearbox, and a single carb. It had no rear suspension, and a leading link front fork with twin leaf spring assemblies. Groundbreaking stuff, back then. The thing is, an original WR 750 is impossible to come by. Which is why collector, racer and master fabricator Jürgen Schwarzmann decided to build one from scratch.

So he joined forces with friends Alfons Zwick and Erich Frey, and the trio eventually ended up creating a small series of WR 750 replicas (the exact number of which is a closely guarded secret).
Their first challenge was finding a blueprint to work from. Only two of Ernst Henne’s original record-breaking machines still exist: one belongs to BMW, and the other is in the Deutsches Museum.

Both existing bikes are land speed racers, modified for straight-line glory. So they are distinctly different from the road racers that Schwarzmann wanted to replicate.
Bits and pieces from the pre-war race bikes do pop up on the radar from time to time. But they’re rarely for sale, and are a far cry from a complete bike. And documentation is sparse too, even in the BMW Group Classic’s extensive archives.

So the trio’s first task was a virtual puzzle build, documenting everything they could about the WR 750 before they even picked up a spanner. Their primary goal was to recreate the bike as accurately as possible, and to make it fully functional.
Once the build itself was underway, each man had a specific portfolio. Frey is an experienced engine designer; he would measure and sketch up pa...
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Behind Closed Doors: BMW’s hidden supercharged WR 750 Behind Closed Doors: BMW’s hidden supercharged WR 750

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Fuente de la noticia: bikeexif
Fecha de publicación: 06-03-2018 21:46
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