Chris Wilson
Moderator
What I find weird is the claim of perfect primary balance in an operating 90 degree V twin IC engine. I would accept the claim in a theoretical model that is driven by a constant speed from the crankshaft but in practice the pistons do the driving and cause an acceleration that is uneven throughout the stroke.
The secondaries or vibration that occurs twice per revolution is not twice the amount gained from 1 cylinder but the square root of 2, or on other words 1.44 times 1 cylinder.
And so a 90 degree V twin will never be as tingly as any other style of twin.
Worst tingly twin that I have ridden is a BMW 800 GT, loved the bike, hated the engine.
The secondaries or vibration that occurs twice per revolution is not twice the amount gained from 1 cylinder but the square root of 2, or on other words 1.44 times 1 cylinder.
And so a 90 degree V twin will never be as tingly as any other style of twin.
Worst tingly twin that I have ridden is a BMW 800 GT, loved the bike, hated the engine.