I have a slight problem with the idea that the engines are made on license, it's really only the hypercycle patent that's licensed. The method of slower than normal combustion, the cavity in the piston,the rest is pretty much American made, including the fuel density compensator, patented in the sixties by Continental and the IP, which is American Bosch, a standard industry item.
The engine was made to military specifications which includes operation to very low temps, which promted the inclusion of a heated intake manifold (coolant) and the flame heater. I also figured out that the reason for the upside down oil filter canisters was to let the oil flow back into the oil pan for heating at very low ambients. Mil Spec, not a German design.
If anyone can show me that this isn't so, please let me/us know.
