In the 1940's, the Germans had the Jumo 223 diesel (2 pistons per cylinder, 2 stroke, supercharged).
Has anybody considered parallel cylinders joined at the top to accomplish the same thing?
The idea would be to have only one crankshaft and no valves, but excellent scavenging. For a simple 2 cylinder engine, there could be an intake port on one cylinder and an exhaust port on the other cylinder (each cylinder has a piston on a common crank).
The joining at the top between the cylinders could allow for a swirl for better combustion efficiency.
Maybe scavenging would be better too.
You could have the efficiency of the Jumo 223 diesel, but with only one crank case (and easier maintenance).
What do you think?
(advantages, disadvantages?)
- Mark