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A significant correction required to posts 109, 110, and 112.
The Napier Deltic has 18 cylinders in a triangular configuration (effectively 3 x banks of 6 cylinders). As the engine has 3 crankshafts (one at the top and one at the bottom of each cylinder bank), and the engine has no cylinder heads but is horizontally opposed, it actually has 36 PISTONS, not 6 as stated. During development, the engineers had significant timing problems until they decided to have 2 crankshafts rotating in one direction, and the 3rd rotating in the opposite direction.
Somewhere I have some Deltic cutaway photos I took in the York Rail Museum. Just gotta find them!
Skilly
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