Tuesday, October 25, 2011

CBR1000RR engine

CBR1000RR engine tweaked for a more enjoyable city riding experience, rather than out-and-out performance as sought by most RR owners. Basic specifications are common with the CB1000R using an in-line four, four-stroke and liquid-cooled power plant. Its lightweight cylinder head is prepared from magnesium, and houses 16 valves. An Intake Air Control Valve, or IACV, works to keep any torque reaction from causing jerky low-rpm conduct, and ensures the CB1000R stays smooth and enjoyable to ride at low speed. An in-built oxygen sensor and 300-cell catalytic converter combines with a sophisticated, electronic fuel-injection system to cut emissions.

Maximum power of 125bhp is developed at 10,000rpm and routed to the rear tyre via a light-action, ◊

∆ hydraulic-assisted clutch that takes advantage of the engine’s strong low-end torque and supplies a nice feel to the rider. The CB uses a six-speed gearbox that shifts smoothly, with respectable feel in a one-down and five-up pattern.

While the drop in power relative to an RR is quite a bit on paper, low rpm performance feels robust on the CB1000R with the bike escaping slow corners with cracking throttle response. And there’s a wave of mid-range power that pulls strongly all the way into the redline.

The CB1000R is a quiet performer with a mere hum apparent at idle, and this soft feel stays constant throughout its equator-wide power curve. Good low- and mid-range performance along with comfortable ergonomics make this an easy bike on which

to power the front wheel off the deck. Fueling always stays well sorted, with the engine firing cleanly and without flat spots anywhere in the powerband.

Although our brief ride didn’t allow us to explore high speeds, it is certain that the absence of a fairing will cause riders to catch uncomfortable windblast, and make riding over speeds of 150-160kph a chore.

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