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BMW Upgrades Boxer Engine for 2010

Thursday, November 5, 2009
The BMW Boxer Flat Twin is upgraded for 2010 with a new cylinder head.
BMW refurbished its iconic Flat Twin Boxer with a new cylinder head and not an increase in displacement.
The DOHC 2010 Boxer design sources two chain-driven camshafts  with each camshaft controlling both an intake and exhaust valve in the radial four-valve head.
The new DOHC radial valve head delivers an extra 5 hp and 3 lb-ft of torque, as well as a 500 rpm higher redline.
The BMW Boxers 2010 compression ratio is unchanged at 12:1  however  a new combustion chamber shape necessitates the use of red-designed cast-aluminum pistons.
It was expected that BMW would debut an upgrade to its iconic Flat Twin Boxer for the 2010 R series. Now the details are revealed, as 2010 motorcycle info leaks prior to the upcoming EICMA Milan Bike Show. Here’s what the spec sheets and PR machine say about the new Boxer.

Same Displacement: No, the Boxer is not gaining any CC. Bore and stroke is identical at 101 x 73mm with the 1170cc displacement unchanged.

New DOHC Cylinder Head: The 2010 Boxer cylinder heads feature cylinder head upgrades first used on the HP2 Sport. The DOHC design sources two chain-driven camshafts, with each camshaft controlling both an intake and exhaust valve in the radial four-valve head. The valves themselves have changed, with diameter increased on both intake (1.42-1.54 inches) and exhaust (1.22-1.30 inches), with valve lift also increased. Compression ratio is unchanged at 12:1, however, a new combustion chamber shape necessitates the use of red-designed cast-aluminum pistons.

Larger Air Intakes: New black throttle butterfly manifolds are larger, up 0.12 inches to 1.97, and work with redesigned intake manifolds and air filter element.

Performance Gains: All the motor tweaks add up to more power and a higher-revving Twin. Peak horsepower claims jump 5 hp to 110 total, with torque up 3 lb-ft to 88. The peak outputs come at a higher rpm, a respective 7750 (up 250 rpm) and 6000 (up 500 rpm). The redline jumps an extra 500 rpm as well, to 8500. Overall, BMW claims the modifications “provide a significantly more homogeneous flow of power and torque throughout the entire speed range.”

Throatier Exhaust: The exhaust system looks identical to its predecessor, but BMW promises a sweeter tune with a new internal structure to the rear can, along with an electronically-controlled exhaust flap. BMW describes the new decibels as “a particularly throaty Boxer sound naturally in full compliance with legal standards.” Naturally.

The new Boxer motor headlines the upgrades to three 2010 R-series machines announced by BMW: the popular BMW R1200GS and its Adventure sibling, as well as the R1200RT tourer.

Dont expect the BMW R1200GS to lose its best-selling status in 2010 with a new  more powerful motor at the ready.
Don't expect the BMW R1200GS to lose its best-selling status in 2010 with a new, more powerful motor at the ready. The new Boxer is utilized by the Adventure version as well.
2010 BMW R1200GS & Adventure

After the engine upgrade, the changes to the 2010 BMW R1200GS models consist of new color options: Alpine White, Magma Red, Ostra Greymatt and Sapphire Black for the GS; and Smoke Grey and Brilliant Yellow for the Adventure. The standard GS now also offers an LED headlight as an accessory option.

2010 BMW R1200RT

Changes to the RT model are more significant, with a redesigned fairing and rider cockpit. The fairing shape looks a little sharper, more angular. The new bodywork is teamed with the new magnesium-colored cylinder covers for aesthetic changes.

Behind the controls a rider is greeted with a refreshed instrument cluster, as well as new switch gear. That’s right, the old paddle shifters that were killed on the K series last year, have left the R1200RT for 2010. On top of the more conventional turn signal switch, the RT will feature and intersting Multi-Controller switch for its optional audio system. The new unit is placed on the interior of the left handlebar grip and works similar to a computer mouse with a rollable, pressable wheel allowing on-the-fly music selection without removing a hand from the bars.

The new fairing design is perhaps most noticeable in the integrated signals  with a new shape in the light.Gone are the turn signal paddles. Note the new Multi-Controller switch on the left grip.The BMW R1200RT gets the new Boxer  as well as a redesigned fairing and controls.
The BMW R1200RT gets the new Boxer, as well as a redesigned fairing and controls, including a new Multi-Controller switch.

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Comments
tim Klassen -seat and other aftermarket accessories...  November 13, 2009 06:18 AM
I like the new 2010 RT and would like to replace my 06 RT. Just wondering if my aftermarket seat, mirrors, CB and other stuff will fit the 2010?
Ada Ada -2010 BMW R1200RT  November 6, 2009 08:05 AM
This is officially the next motorcycle I want, but may not be able to afford. I'd have to sell two that I have, a Vulcan 2000 cruiser and my beloved Tiger. THen I'd still have to conme up with bucks.