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Opitec 420


This interesting engine was supplied as a kit of parts. Some of the more critical parts were ready machined but most were supplied as raw stock. Most of the engine parts, the boiler and firebox are brass. The remaining engine parts are steel. The burner is made from aluminium extrusions and is designed for solid fuel tablets. The engine is mounted on a wooden block and the whole is mounted on a wood base. It's a good looking engine with lots of brass, including the firebox.

The kit was assembled in 2007 but was purchased a few years earlier.

The burner slides onto a bracket located inside the brass firebox / boiler support. The horizontal brass boiler is 40mm diameter x 102mm. It has turned brass plate ends. Originally, it was fitted with a safety valve but no other fittings. I have added a water level plug in one end. The copper steam feed pipe is soldered directly into the top of the boiler and directly to the engine bracket at the other end. There is no throttle or lubricator. The cylinder is square external section, 8mm bore x 24mm stroke. The flywheel is a solid brass disk 50mm diam x 4mm, with the crank pin fixed to it. The other end of the crankshaft has a small pulley.

Make Model Made Description Cylinders Cylinder Type
Opitec 420 2007 Stationary 1 single acting
Piston Diam mm Stroke mm Valve Type Boiler Type Fuel Mechanical Condition
8 12 Oscillating Cylinder Horizontal Tablets Good
Cosmetic Condition Paintwork Packaging Purchased Purchase cost Additional cost
Fair N/A
2005 30.00