Raid The Revenge
Super Member
Okay. Claud has discovered a flaw with the R1. There's something you guys should know...uhh..but there's NO WAY I CAN SAY IT! He's saying these weird words and stuff I completely don't understand. Here he is:
Do you remember the "chatter" from the '06 M1? The one that utilized a crossplane crankshaft to trade a disruption in balance for more throttle response? The one that required countless hours of virtual testing; only to be resolved by sudden tweaks by that rider, Valentino Rossi?
Yamaha has declared the same concept on the YZF-R1 of 2009. They have claimed to have perfected the concept; a purposely conducted combustion-cycle with an uneven firing order. The R1 engine used to fire in a sequence from left to right; 1,2,3,4. A 180 degree firing interval. A perfect resonance. The crankshaft balancers would work in opposite of one another to achieve balance and low vibrations. It took slightly more time for the revving cycle to accelerate...
The crankshaft of the new 2009 model is now of a crossplane design. This causes the firing order to change; 1,3,2,4. The firing intervals are uneven. The final word is: response. You are given more throttle response with this setup, without any true gain of power, but now comes the flaw...
Asymmetry. The very fundamental that caused the "chatter..." this was alleviated by adding more counterweights to the crankshaft, but that didn't rid of the final and indefinite problem: wear. Imagine a motor where one chamber works harder than the others, causing asymmetrical wear with the leftmost piston chamber.
Titanium valves? I've always despised the usage of rare materials to achieve something so simple.
Do you remember the "chatter" from the '06 M1? The one that utilized a crossplane crankshaft to trade a disruption in balance for more throttle response? The one that required countless hours of virtual testing; only to be resolved by sudden tweaks by that rider, Valentino Rossi?
Yamaha has declared the same concept on the YZF-R1 of 2009. They have claimed to have perfected the concept; a purposely conducted combustion-cycle with an uneven firing order. The R1 engine used to fire in a sequence from left to right; 1,2,3,4. A 180 degree firing interval. A perfect resonance. The crankshaft balancers would work in opposite of one another to achieve balance and low vibrations. It took slightly more time for the revving cycle to accelerate...
The crankshaft of the new 2009 model is now of a crossplane design. This causes the firing order to change; 1,3,2,4. The firing intervals are uneven. The final word is: response. You are given more throttle response with this setup, without any true gain of power, but now comes the flaw...
Asymmetry. The very fundamental that caused the "chatter..." this was alleviated by adding more counterweights to the crankshaft, but that didn't rid of the final and indefinite problem: wear. Imagine a motor where one chamber works harder than the others, causing asymmetrical wear with the leftmost piston chamber.
Titanium valves? I've always despised the usage of rare materials to achieve something so simple.
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