Mamod SP5

c1979

The Mamod SP5 is the updated SP series version of the twin cylinder SE3. Apart from the updated SP styling, the main differences are the reversing mechanism, a larger flywheel and the base mounted cast chimney, common to most of the SP series. This model was introduced in 1979. A substantially modified version, commonly known as the Mk2, was introduced around 2000.

It has two single acting oscillating cylinders. The engine has a reversing lever which shifts both cylinders together to align with forward and reverse ports. A pulley is mounted on the crankshaft adjacent to the flywheel. On the boiler are a safety valve and a whistle. The chimney, mounted on the base instead of 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 plain tablet type tray incorporating a guard. The steam feed has no superheating. The horizontal brass boiler rests on the firebox, held in place by the shaped ends of the firebox. The Base is a pressed steel example with an area of Meccano-standard holes to one side. The engine components are mounted on a shallow plinth.

The boiler dimensions are 1.75" diam. x 6" long and the cylinders 5/16" diam. x 5/8" stroke. The colour scheme is typical of the SP series with a red base, blue engine frames, silver plinth and black firebox. The flywheel spokes are also red. The boiler and the cylinders are unpainted brass.

Make Model Made Description Cylinders Cylinder Type

Mamod SP5 c 1979 Stationary 2 Single acting reversible

Bore mm Stroke mm Valve Type Boiler Type Fuel Mechanical Condition

8 16 Oscillating Cylinder Horizontal Tablet Good

Cosmetic Condition Paintwork Packaging Purchased Purchase cost Additional cost

Good Original Cardboard box
9/4/2015 Ł120.00