>Smoothness is all down to the movement of the pistons relative to each
>other. They need to fire in a sequence such that their momentum
>relative to each other balances out.

I'm having a fit of dumb**** and not following. I'm well aware of how the
standard combustion driven engine operates but I'm not sure as to how a
4-cylinder with a 1-2-3-4 firing order could be any more or less smooth than
one with a 1-3-4-2 firing order, or any other variation. Beyond that, I've
ridden in a W12 Pheaton and found it to be quite smooth, so I find Ghee's
claims (as usual) to be obnoxious.