Like beauty is subjective, so is everyone’s preference for motorcycle exhaust note.
V-Four engines are among the best – if not the best – sounding.
Listen to this Yamaha YZF-R1 and Aprilia RSV4 RF.
Just as beauty is subjective, so is everyone’s preference for motorcycle exhaust note. To bikers, the exhaust note is another aspect which stirs the sould. However, V-Fours sound the best in our books as demonstrated by this Yamaha YZF-R1 and Aprilia RSV4 RF.
Yes, yes, the Yamaha R1 isn’t a V-Four but an inline-Four, instead. But I’m sure you already know that the “crossplane” crankshaft is arranged in such a way that the engine fires like a V-Four, hence sounding like one. Or like some say, sounds like Valentino Rossi’s YZR-M1 MotoGP bike.
The crossplane crankshaft spaces the crankpins at 90ofrom each other. Therefore, the R1’s firing order mimics the firing order of a V-Four with a 180ocrank, which gives it a 270o– 180o– 90o– 180oignition timing. The irregular firing order is what gives the bike its distinctive exhaust note compared to traditional inline-Fours.
The Aprilia RSV4, on the other hand, uses a 65oV-Four with a 180ocrankshaft. As such, the firing order is a regular 180o– 115o– 180o– 245o, giving it another distinctive and gloriously LOUD(!) exhaust note.
By the way, the numbers with degrees denote the crankshaft rotation angle.
NOTE: Please ride responsibly on public roads.
Video credit: SuperBike Racer