Nick Müller wrote:

Mike wrote:

Here is some examples of single cylinder, two piston per cyl.,engines using
one combustion chamber in diesel.

Opposed piston diesel engines. First built by Junkers.
Need something more weird? "The Deltic Engine".

Nick

I thought you may have mentioned something more home
grown, like the Junkers Jumo 223 or 224?
Taking the Napier connection with Junkers, maybe it was
these engines that inspired the Deltic?

Tom