2009 R1 might not be the prettiest looking bike, but
- Thread starter Toecutter
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Bogie
Two Wheels Forever!!!
Ben Spies and Tom Sykes testing the 09 R1 then running some laps on the the 08 then back on the 09.
Really can hear the difference in the bikes!!
https://link.brightcove.com/services/link/b...bctid1904707279
Really can hear the difference in the bikes!!
https://link.brightcove.com/services/link/b...bctid1904707279
Shadow
Well-known member
Crossplane
Big Bang
Big Bang
Shadow
Well-known member
Bogie
Two Wheels Forever!!!
Yup...I'm very aware of that but I just love the sound of the motor!! :yahoo:
MMMM!! Listen to this clip of Sykes's 09 WSBK R1!! : :dribble:
spalkin
Well-known member
The sound is incredible. As for the looks, they're all going to the 'praying mantis' look. More technical than organic I guess. Looks great.
Rider has a bit this month about the new GSXR 1000. Complete makeover. I can't wait for the comparo with our R1.
The bike that lacks in looks, IMO, is the Buell but when you see it in person it's amazing.
Rider has a bit this month about the new GSXR 1000. Complete makeover. I can't wait for the comparo with our R1.
The bike that lacks in looks, IMO, is the Buell but when you see it in person it's amazing.
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fjr105
Well-known member
I'd love to put one of these bad ***'s in the stable next to the FJR
:aacool:
:aacool:
Bogie
Two Wheels Forever!!!
Bulldog9
Well-known member
My understanding of this new engine design (been used in racing bikes, this is the first production engine with this design) is that only ONE piston is at top dead center at a time, where previous inline 4's have two cylinders at TDC at a time. This allows a more linear and tractable application of the power to the road.
timk
timk
with an uneven firing
interval of 270°- 180°- 90°- 180°
Why is this a uneven firing order?? Seems like 90 degrees apart. What would be an even order?????
interval of 270°- 180°- 90°- 180°
Why is this a uneven firing order?? Seems like 90 degrees apart. What would be an even order?????
Ari Rankum
NAFO Karting Champion, 2012
It's a 4-stroke motor. So it's suck, squeeze, bang, blow (oh crap...counting down to odot in 3, 2, 1...) over two complete revolutions of the crank (720 degrees). An even firing interval would have each piston firing at 720/4, or 180 degrees apart. In the crossplane design, the sum of all the firing intervals is still (obviously) 720 degrees, but the intervals are not all equal. The pistons all being spaced 90 degrees apart only ensures that the interval between firing is a multiple of 90 degrees and that the sum of all the intervals is 720 degrees, but does not require that the intervals are all equal.
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Yeah, exactly. The standard I4 firing order, translated to the full 720 degrees of the 4-stroke cycle would be 0 - 180 - 360 - 540 - 0...
I believe what they're saying is this engine fires at 0 - 270 - 450 - 540 - 0...
I'm not sure why this uneven firing order is supposed to be such a benefit. I guess maybe it allows you to mix some of the horsepower benefits of even firing (like standard I4) with the torque benefits of a V engine.
I believe what they're saying is this engine fires at 0 - 270 - 450 - 540 - 0...
I'm not sure why this uneven firing order is supposed to be such a benefit. I guess maybe it allows you to mix some of the horsepower benefits of even firing (like standard I4) with the torque benefits of a V engine.
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MotorToad
Well-known member
It's more like "kinetic energy management."
The main benefit to the cross-plane crankshaft is the conservation of kinetic energy. On a flat-plane crank all four bouncy bits stop completely twice a revolution, which means the crank and flywheel mass have to jerk them all back the other direction at the same time. The amount of energy needed to do that increases with revs and can be close to the engine's total torque output at the revs GP bikes are running, which makes for horrible spikes and valleys in the resulting power output. With the cross-plane crank, half the bouncy bits are at 100% velocity when the other half are stopped. Even though the pistons have to be ****** back the other direction, it's only half as many and the other half are helping the crank's mass to do it. The downside to the cross-plane is that it requires balance shafts to control the wobble, the crank's no longer symmetric and the ends want to travel in circles out of phase with each other. You can see the lobes for the counterbalancers on the front of the engine. Traditionally, this extra spinning mass has made the crank too heavy for racing use, but as revs go up needs change.
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Bulldog9
Well-known member
This all makes lots of sense. Is anyone else wondering why this isnt the normal way engines are built?
Toecutter
What would DoG do?
Well, there is that whole primary mis-balance thing. The added complexity of balance shafts and such.
To me, a better solution is the one taken by BMW automobiles for all these years. Build inline 6 cylinder engines. But a tad tough fitting one in a bike...
To me, a better solution is the one taken by BMW automobiles for all these years. Build inline 6 cylinder engines. But a tad tough fitting one in a bike...
