[freebeard]

I just got here from the thread in General Efficiency.

In this case I'll point to the Chrysler A57 Multibank

In order to use existing tooling, five Chrysler ... L-head inline six cylinder engines were arranged around a central shaft, producing a unique 30 cylinder 21 litre (1253 in3)[1] engine in a relatively compact but heavy package. The crankshafts were fitted with gears, which drove a sun gear arrangement.