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Mamod SE3 Twin Cylinder


The Mamod SE3 is a typical twin cylinder stationary engine of around 1970 vintage. This model was introduced in the late 1950s but similar models were produced by Mamod before and after then and an updated derivative SP5 is still available. It should not be confused with the earlier (pre-war) SE3, which is only single cylinder. The twin cylinder pre-war equivalent was the SE4.

It has two single acting oscillating cylinders with disk type cranks either side of the spoked flywheel. A pulley is mounted on the crankshaft adjacent to the flywheel. The engine has no reversing lever but it does have a throttle valve mounted on the top of the boiler. Also on the boiler are a safety valve and a whistle. (The whistle in the photographs is not the original. It has been replaced by a modern spring loaded type whereas the original was a rotary valve similar to the throttle.) The chimney, also mounted on the boiler, has the exhaust steam fed to it, via a pair of pipes from the cylinders, but not the burner exhaust. The burner is a perforated plate type spirit burner. The steam feed pipe passes under the boiler through the flame to provide a degree of superheating. The horizontal brass boiler rests on the firebox, held in place by a pair of U shaped wire straps. The Base is a pressed steel example with Meccano-standard holes around its periphery.

The boiler dimensions are 2" diam. x 6" long and the cylinders 5/16" diam. x 3/4" stroke. The colour scheme is typical Mamod with a red base, green engine frames and black firebox. The flywheel spokes and the inside of the chimney are also red. The boiler, outside of the chimney and the cylinders are unpainted brass.

A pair of SE3's form the basis of my triple cylinder conversion, details of which can be found here. I also have a sectioned example here.

Make Model Made Description Cylinders Cylinder Type
Mamod SE3 c 1972? Stationary 2 Single acting
Bore mm Stroke mm Valve Type Boiler Type Fuel Mechanical Condition
8 16 Oscillating Cylinder Horizontal Meths Good
Cosmetic Condition Paintwork Packaging Purchased Purchase cost Additional cost
Good Original?
May 2002 85.00