The motorcycle brand describes the sound that its V-twin engine makes as “potato-potato-potato.” And the sound is so recognizable and so central to the brand identity that in 1994, Harley-Davidson applied to have it trademarked.

As a result, after the first cylinder fires, the second has to wait until the shaft has completed 315 degrees of rotation. Then there is a 405 degree gap until the first cylinder fires again. This asymmetrical arrangement is what gives Harley engines their distinctive, deep bass rumble.

Consider that your average leaf blower produces around 70-75 db at a 50-foot distance, enough such that the operator has to wear hearing protectors. Unmuffled Harley engines can put out around 120 db.