Charles Ramsey has designed a prototype engine, the RAM-Z with four horizontally opposed cylinders initially to be tested in a car.

-It had multiple improvements to reduce pollution. It was small in size and it only gave 10 HP at 1,600 rpm and 16 HP at 2,500 rpm. The Diesel version was studied at the time of the below photo.

"Charles and collaborators"

-It had no camshaft but valves inside the shuttle-type double piston as we see in the below illustration.

"Cross-section of this original engine"

-As Ramsey's habitual residence is in the state of Indianapolis, he was able to count on the support of the Rose-Hulman College of Engineering.

-The pistons are double concentric, one of them stationary -the central one- and another mobile “outside” that connects with the crankshaft.

-The chamber that is created on each side between the two pistons is the compression chamber and the combustion chamber is between the outer piston and the cylinder head.

-The mixture passes through the two pistons by means of non-return valves and the exhaust is produced by lateral ports in the wall of the engine cylinder, as we see in the diagram.