kraftwerk
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2009 Yamaha YZF-R1I'm not particularly interested in modern sportsbikes, but I do enjoy their annual incremental technological improvement...
The 2009 Yamaha R1 has been officially unveiled, and it has a Yamaha M1-like big bang firing order. The first time a big bang engine has been used on a production bike, Yamaha is calling it “Crossplane Technology” and it puts each connecting rod 90º from the next, meaning the cylinders fire at 270°- 180°- 90°- 180°. This spreads out the power pulses to the rear tyre, allowing it to regain traction in between each pulse. The result is more usable traction under large throttle openings, meaning riders will be able to accelerate out of corners earlier and harder. MotoGP-derived technology for the street.
Engine:
* Crossplane crankshaft technology proven in victory after victory on MotoGP machines provides a high-tech uneven firing interval. Unlike typical in-line-four engine design, where the two outer and two inner pistons move together in pairs with 180°intervals, the crossplane crankshaft has each connecting rod 90° from the next with a unique firing order of 270° –180° – 90° – 180°. This overcomes the inherent fluctuations in inertial torque during each engine revolution, and the accompanying peaky torque characteristics. Instead, compression torque continues to build, giving the rider more linear throttle response with awesome power and traction out of the corners.
* To maximize rider comfort as well as power output, this newly designed engine adopts a coupling-type balancer that rotates in the opposite direction as the crankshaft.
* This engine features new forged aluminum pistons to take maximum advantage of the power characteristics. As proven on previous models, intake valves are lightweight titanium.
* A forced-air intake system is adopted to increase intake efficiency by using the natural airflow during riding to pressurize the air in the air cleaner box. This contributes to outstanding power delivery characteristics in the high-speed range, while the design also helps to minimize intake noise.
* Slipper-type back torque-limiting clutch greatly facilitates braking/downshifting from high speed.
* The exhaust system is completely new. It’s meticulously designed to enhance engine output while, thanks to its threeway catalyst technology, also reducing exhaust emissions. The silencer is a single expansion type, and, the sound coming through from the unique crossplane-crankshaft-equipped engine is unlike any other in-line four cylinder production supersport.
* This fuel-injected engine takes full advantage of YCC-T (Yamaha Chip Controlled Throttle), the MotoGP-inspired fly-by-wire technology used to deliver instant throttle response. There’s also YCC-I, Yamaha Chip Controlled Intake, the variable intake system that broadens the spread of power. Fuel injectors have 12 holes for precise fuel delivery that translates to the most power from every fuel charge.
* Have it your way, thanks to Yamaha D-MODE variable throttle control. There are three modes that control how YCC-T responds to throttle input from the rider. The selectable “A” mode puts more emphasis on acceleration in low to midrange rpm. “B” mode, on the other hand, provides less sharp response to input for riding situations that require especially sensitive throttle operation. Selecting the map you want is as easy as pressing a button on the handlebar.
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Blarno
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Yummy.
I need a bike....
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Matt
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It'd be interesting to have each year's iteration lined up side-by-side to see the evolution. That one looks quite square of the fairing, compared to the previous, pointy one.
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Dr. Hfuhruhurr
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Re: 2009 Yamaha YZF-R1 | kraftwerk wrote: | | The 2009 Yamaha R1 has been officially unveiled, and it has a Yamaha M1-like big bang firing order. |
Forgive my ignorance - presumably the M1 is the racing version?
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kraftwerk
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Re: 2009 Yamaha YZF-R1 | Dr. Hfuhruhurr wrote: | | kraftwerk wrote: | | The 2009 Yamaha R1 has been officially unveiled, and it has a Yamaha M1-like big bang firing order. |
Forgive my ignorance - presumably the M1 is the racing version? |
Yes, M1 is the MotoGP bike.
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Li'ldude
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My best friend's got her bike license, and is in love/lust for a YSF R125, but she claims that the weather here is too bad for bikes.
Out of intrest, has anyone else had the climate make this sort of decision for them before?
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