No and no.jgredline wrote:To put it simply my guess would be two main things. I have not had a chance to sit down and really think about it, but my guess is this.
1) the crankshaft in a v10 would be symetrical and close to a 4cylinder engine where the counter weights are opposite each other. With the V8 crank this is not possible.
2) The firing order. With a V10 it is very posible and likely to have a firing order that would be 12345678910 (odd numbers on one side and even numbers on the other) With this style of firing order the exhaust header would also follow the same sequentail firing order thus producing less resonence and smoothing out as the RPMS go up.
Like I said I will need to think of it a little bit more, but this would be my quick guess.
1) With a V8 that is possible, and common- it's the flatplane crank that everyone has been talking about. That's very common.
You could not do a flatplane crank with a V10 because it would cause enormous side-to-side vibration. At any given time, you would have 2 pistons up and 3 down on one side and 3 up and 2 down on the other. Doesn't sound very balanced, does it? It only gets worse when firing order is concerned, because the greatly uneven torque pulses would mean that the side to side and front to back vibrations would only get exaggerated. It would be a very bad setup.
On the contrary, V10 crankshaft's throws are always seperated by 72 degrees (if looking straight on from the front), although they do not spiral down in that order. To achieve better balanced, for example, they are usually offset by 144 or 216 degrees from throw to throw, but each position along the circle 72 degrees apart is taken into account.
A picture would do a better job to help you visualize.
(And yes, that is only talking about even-fire crankshafts. I'm well aware many street V10s are odd-fire)
2) You couldn't have a firing order like the one you mentioned, 1-2-3-4-5-6-7-8-9-10. The issue here, besides the fact that it would seriously hamper cylinder filling and cause horrid resonance issues, is again the vibration issue. If the torque pulses happen such that they start in the front and work their way back, the end to end vibrations will shake the thing apart faster than you can say "waste of money". Besides, that firing order would be impossible given the way the V10 crankshafts are actually set up.