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Join Date: Sep 2004
Location: Bryn Mawr, PA
Posts: 1,207
Sportboxer with "new valve system"

Some of you guys speculated about the valves on the R1200S bike that was run at LeMans in late April. Now, MCN ( vol. 38, no.7 - July 2007) has a quick write-up on the bike on page 10. Among the many details - a factory quote of "over 134 hp@ 9500 rpm" -is a cryptic description of the motor having "a new valve operating system".

Have the details leaked out elsewhere? Is it a new system or just a modified old system?

Old 06-19-2007, 06:50 AM
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pdonnell's Avatar
Join Date: Jan 2000
Location: No. CA
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I'm sure Dr. Curves article addressing this will be out shortly.
Old 06-19-2007, 07:14 AM
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time wasting tosser
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no details, but boxercup posted some pics after the LeMans race which definately show something is different under the valve covers. I believe he said, "highly modified".

modified R1200S questions...

SportBoxer BMW Sprechen Sie

Last edited by Highlander179; 06-19-2007 at 07:50 AM..
Old 06-19-2007, 07:33 AM
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Join Date: Dec 2000
Location: Westlake Village, CA
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The Motorcyclist article this month covering BMW's early-90s desmo operated valve system stated that BMW felt this feature was very important to Ducati's dominance at the time... Of course, this was used in a radical layout that made the rider hold his elbows out to avoid the air intakes.
2010 MG Griso 8V
2000 R1100S (retired)
Old 06-19-2007, 10:20 AM
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Regnat populus
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Location: Manhattan, NY USA
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BMW Roundel NOT


The pictures you refer to were posted for comments.... BMW stimulation

Quite simply the engine was modified with durability in mind.

This is the same engine that is in the "R1200S". Just a few mods!

They call it the R1200RS SportBoxer. Same cam configuration as the R1200S. A road version is what is speculated on this board as the "HP" version. It is the R1200RS

What BMW MotorSports is working on now is getting more power and still having the durability. They have quite a few engines that are modified and being tested. They would do well with more HP.

The R1200RS has an output of 140HP on the high side and also had the revs bumped up 1000 Rpm. But that was lowered before the LeMans race. They had to finish at any expence.

Now in the future Bertie Hauser has in mind the Daytona 200 this coming year with a Formula Extreme sprint version. This bike will compete in the Daytona 200 and some select AMA races.

Oh..... BMW is buying Husky from MV Agusta.

A 250CC BMW is not far off. Yes, a newly designed 22KG 4 valve single.
BMW is going to the dirt...

Soon a BMW dealership will look like a Honda showroom with all the models...


Robert Foster

LASER Engineering Exhaust Systems
RapidBike USA
Oakland Gardens, NY

Do not go where the path may lead, go instead where there is no path and leave a trail.

Last edited by boxercup; 06-19-2007 at 04:35 PM..
Old 06-19-2007, 03:46 PM
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