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Alpha Racing BMW-GS in the test
More power for the water boxer
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Alpha Racing wants to give the boxer more pressure with a variable valve control. The first test drives are promising.
A small side street in the Bavarian hinterland. Zero degrees, winter. Nobody suspects a motorcycle here, at most a GS. But what is it? A GS roars by, but with strange cylinder heads and a completely different sound. And very, very fast. Test drive with the alpha Racing BMW and its patented valve control system. Uwe Eisenbeis, mastermind and patent holder behind the system called VVL, promises a whopping 146 hp.
How does it all work? Instead of a conventional throttle valve, the output is controlled via the valve lift of the intake valves. Idle: hardly any valve lift, full tank: large valve lift. Sounds logical, but mechanically it is not easy to solve. Eisenbeis, who developed the system during his time as an engine builder at BMW, has a solution.
I.A small crankshaft with a connecting rod rotates at the head, which moves a sliding piece with rollers back and forth over the two rocker arms of the inlet valves. The whole thing is stored in an aluminum frame that can be swiveled and thus more or less pressed on the rocker arms.
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Alpha Racing BMW-GS in the test
More power for the water boxer
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