Quote:
Originally Posted by RWebb
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The imbalances in a V-8 create an interesting harmonic structure ("rumble") and are fairly well controlled, altho the imbalances are greater than in a flat design.
(A V-6 is a horribly imbalanced design and I hate hate hate them -- the V-6 does go well with cup-holders however.)
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A US V8 w/ a 90* V angle and a 90* or X-plane crank creates it's characteristic rumble from it's need to sequentially fire 2 cylinders from 1 bank and then 2 from the other. These creates a stumble in the sequence of exhaust sounds that many find pleasing. There is a similar stumble(though for a different reason) in HD and Ducati exhaust notes
The Ruf V8, like Ferrari V8s, and most champ car V8s while using a 90* V angle, use a 180* or flat crankshaft. These engines like a stock Porsche flat 6 always fire alternate banks so do not have the stumble to their rumble. They also have different exhaust needs related to their firing orders.