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Microcosm M28


This is a twin cylinder horizontally opposed stationary engine, although it was probably designed for marine applications. At first glance, from a distance, it may appear to be an oscillating cylinder type, but in fact, the cylinders are fixed and a rotary valve is built into the crank shaft and it's bearing. The connecting rods are connected directly to the pistons, similar to those in a car engine.

The cylinders are approx 7mm bore x 7.5mm stroke. The connecting rods are both connected to a single crank pin. The crankshaft bearing contains a rotary valve, the rotating part being the crankshaft. The 18mm diameter flywheel is a deep marine type, mounted on the end of the crankshaft.

Make Microcosm
Model M28
Made c2017
Description Stationary/marine
Cylinders 2
Cylinder Type single acting horizontally opposed
Piston Diam mm 7
Stroke mm 7.5
Valve Type Rotary
Boiler Type N/A
Boiler Diam mm N/A
Boiler length/height mm N/A
Fuel N/A
Mechanical Condition Good
Cosmetic Condition Fair
Paintwork N/A
Purchased 15 March 2018
Purchase cost 55
Additional spend