BMW HP2 Sport October 2007 A Road
Race Bimmer for the Road
Exotic HP2 Sport joins the hero bike line-up
If you've been a fan of BMW's
sometimes quirky but always interesting Boxer series of powerplants,
this new toy, released in
It's no secret that BMW has been working very hard in recent years to shake off its old pipe-and-slippers image for a harder-edged and sportier version. In fact the company has done a pretty good job of dazzling us with a variety of 'hero' bikes based around its boxer-twin engine series. The latest in the hi-po line-up is the HP2 Sport, a replica of the factory endurance racer. By far the biggest news with this machine is the fact it has been running double-overhead cams - a first for the modern twins.
BMW executive, Peter Muller, used
the
The BMW HP2 Sport is aimed at purist sports riders and is equipped with many racetrack derived features proven in endurance racing during 2007. Some parts, such as the race shift for the close ratio gearbox, forged alloy wheels and MotoGP inspired dashboard are making their first appearance in a BMW series production machine. The BMW HP2 Sport will deliver thoroughbred sports riding on winding country roads as much as on race tracks.
The highly tuned Boxer engine now delivers in excess of 96 kW (130+hp) at 8,750 rpm, even more than the R1200S launched in 2006. Peak torque is 115 Nm at 6,000 rpm, while the power doesn't taper until it reaches the lofty red line at 9,500 rpm. Making the HP2 Sport the highest revving Boxer ever.
Essentially, the BMW HP2 Sport is based on the BMW R1200S. But there are significant mechanical differences, along with a new, race-ready composite carbon fibre body, race wheels and optional switchable ABS.
To allow the new HP2 motor to rev so high BMW has evolved a new cylinder head valve gear design for the double overhead camshaft layout, now using a drag lever for valve actuation. Bigger valves are also used. The double spark plug arrangement used recently on R series machines has been replaced with a single plug per cylinder thanks to radially arranged valves that provide a very compact combustion chamber design. Further modifications include porting for intake and outlet flows along with new forged pistons and connecting rods, all of which help the engine to rev higher and deliver more power.
The compression ratio is 12.5:1 and the engine runs on 98 RON or above and a pair of oil coolers is positioned behind the enhanced BMW kidney grilles in the front fairing. Externally the engine changes are announced via new carbon cylinder head covers fitted with easy-to-replace slip pads made from PA6 hard plastic, an indication of the expected hard cranked over cornering riding style.
A new stainless steel exhaust system is placed below the engine for the first time, while the silencer is of a particularly striking design. The rerouted two-into-one pipes keep the underside of the bike clear giving even more clearance for heavily banked high speed cornering.
Designed to thrill performance riders, the HP2 Sport comes with a new BMW feature, a race shift that incorporates advanced electronic control to allow the quickest possible gearshifts. The standard setting is for the rider to use the gear-shifter only, to move up the gearbox. By keeping the throttle open and ignoring the clutch lever, the rider can simply shift up with his foot. The benefit is quicker shifting and thus faster acceleration. Sophisticated electronics automatically sense the up-shift motion from the shifter and cut the ignition momentarily allowing the shift to take place when the engine is not under load. If the rider uses the clutch lever a traditional clutched up-change is effected. The default mode is race shift for switching between the six close ratio cogs. The race shift can also be optionally ordered with a reverse pattern shift and associated software specifically for competition use. This is the first time BMW has offered a race shift for a series production model.
The BMW HP2 Sport also boasts a sport chassis with fully adjustable Öhlins shocks front and rear, while a Brembo brakes set-up employs four-piston radial mounted callipers at the font grabbing a pair of 320 mm discs. A double sliding piston set up is used at the rear. Braided steel brake lines are used for optimum performance. Given the enhanced performance it was only natural that BMW engineer a specific and optional switchable ABS system for the HP2 Sport.
The BMW HP2 Sport runs on specially developed, weight and stability optimised, surface-milled forged wheels of 3.5 x 17" and 6.0 x 17". The forged wheels are fitted as standard with high performance tyres (120/70 ZR17 front and 190/55 ZR17 rear).
Optimum ergonomics are ensured by the adjustable forged aluminium footrests, adjustable stock handlebar and radial Magura clutch/brake levers.
The instrument cluster is all digital and is based on a MotoGP set-up, delivering the traditional speed and rev information along with useful race data such as lap times, etc.
Maximising the benefits of the improved power output is a stringent weight optimisation programme which has seen the wide application of lightweight composite carbon fibre for the front fairing and belly pan as well as a simplified rear structure which has an easily unclipped licence plate and tail light. Thus the BMW HP2 can be made race-ready in seconds.
The wind-tunnel honed front fairing is stiff enough to dispense with a subframe, a further weight saving. The front vista is dominated by lightweight, high-luminosity halogen twin headlamps with free-formed surface reflectors surrounded by the exposed carbon fairing and trade-mark kidney grilles which feed air to the oil coolers.
Thanks to the weight saving programme the BMW HP2 Sport tips the scales at 178 kg dry, and 199 kg ready to ride.
Rider ergonomics are suitable for both on track riding and endurance comfort. Compared with the BMW R1200S, the rider sits closer to the handlebars for a more upright position, behind the 'waistline' of the fairing. The slim-line tank is shaped to allow the rider to shift his weight across the bike when cornering hard.
Source: BikePoint