Les motards sont des lopettes.
C'est Furusawa qui le dit :
"The throttle-opening ratio spread of the MotoGP machine is opposite to that of a Formula One car, noted Furusawa. A Honda F1 engineer confirmed that at the fast Monza circuit, the F1 Italian GP track, full throttle would account for massive 74% of all running, whereas a MotoGP rider at Mugello, another fast track, would crack the throttle wide open for only 25% of the race. More notable, Furusawa elaborated, is that less than 10% open throttle accounts for roughly 30% of the race."
Et il affirme ne pas être convaincu par les arguments habituellement entendus pour expliquer la supériorité des moteurs big bang ou long bang :
“Uneven- or irregular-interval firing has been employed in racing engines—the so-called ‘Big Bang,’ with more than one cylinder firing simultaneously,” Furusawa explained. “Then there is the ‘Long Bang,’ with crank phases out of sync. Uneven-interval firing race engines have been known to improve lap times versus even-interval firing ones. How and why they work has not been clearly defined,” he said.
“Some maintain that closely spaced, multicylinder combustion pulses press the driving tire’s contact patch against the road surface harder, to a degree that the tire slips or spins, then enables the tire’s ‘recovery’ during the following non-combustion interval, so that pent up energy generates a stronger grip on the next power pulse—a rather dubious supposition that I do not subscribe to at all,” he continued.
Selon lui, l'intérêt de l'achitecture réside en l'amélioration de ce qu'il assimile à un rapport signal/bruit : en concentrant la combustion sur une période temporelle plus courte, il améliore le signal (pic de couple moteur) pour un "bruit" donné (dû aux effets inertiels, très importants à haut régime) :
“What the rider wants is combustion torque proportionate to the throttle work, not inertia torque,” said Furusawa, who drew an analogy to signal-to-noise ratio (SNR), an electrical engineering term. “Combustion torque is a signal, and inertia torque is noise. Unfortunately, noise increases proportionately to the square of revolutions, greatly deteriorating the SNR.”
