In article >, Steve Grauman
> writes
>>no, not all engines are the same, if you drive a W-8 back to back with a V-8
>>the W-8 will not be as smooth, it has odd firing sequence.
>
>What the hell does the engine's firing sequence have to do with smoothness?

Err, everything!

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.
--
Toby