Supplied fully assembled the Clyde twin cylinder oscillator engine, from Miniature Steam, has an 11mm bore/stroke and is designed to operate on steam pressures between 30 and 45psi. The engine’s cast components are from a marine grade non-corrosive alloy which will not tarnish or corrode like traditional brass alloys often used in inferior model oscillator designs. The crankshaft is from stainless steel and the remainder of the machined components from brass. This combination gives maximum protection from corrosion and helps to give excellent life to the engine.