> I may be wrong, but isn't odd/even related to V type engines,
> and meaningless on inline engines?
Not necessarily. "Even fire" means that the cylinder firings are evenly
spaced around two rotations of the crankshaft (for a 4 cycle engine).
The old John Deere inline 2 cylinder tractor motors were odd fire. Instead
of having the crank arranged so both pistons came to TDC at the same time
(as required for an even fire 4 stroke 2 cylinder), the throws were
opposite. Thus the cylinders fired 180 degrees apart, then no firing for
540 degrees. The resulting exhaust note earned them the nickname "Johnny
But I don't know of any other examples of inline odd fire engines.
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