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Mamod SC2

1939-40







The SC series of engines were similar to the original SE engines except that they had a built in line shaft instead of gears. They were not particularly popular at the time and were only produced for a short period, so they are now quite rare and desirable.

The brass boiler is 4 1/8" long x 1 3/4" diameter. It is fired by a 2 wick meths burner. It has a chimney, steam feed, safety valve and water level plug. Steam is fed through a pipe, with compression fittings at each end, directly to the back of the port face.

The single acting oscillating cylinder is 5/16" bore x 1/2" stroke. It has a cast brass frame incorporating the port face and crankshaft bearing. Exhaust is fed via a compression fitting and pipe to the base of the chimney. The crankshaft has a disk crank on one end and a small 5/16" pulley on the other. In working order, the small pulley is belted to a 1 1/2" pulley on the line shaft.

The line shaft is fitted with two other pulleys, 1/2" and 1" diameter. The shaft is Meccano standard 5/32" diameter. It is supported on a pair of cast alloy frames bolted to the base.

The engine is in generally good condition for it's age. On receipt, it was stiff and dry but a few drops of oil freed it up. The safety valve was seized solid due to the perished remains of a rubber washer. I have cleaned it up and fitted a new O ring and it now works ok. The bush for the water level plug needed resoldering. The engine runs well on air and steam, although it could do with some running in. The paintwork appears to be original and is in good condition.

Make Mamod
Model SC2
Date Made 1939-40
Description Stationary with line shaft
Cylinders 1
Cylinder Type Single acting
Bore mm 8
Stroke mm 13
Valve Type Oscillating cylinder
Boiler Type Horizontal
Boiler Diam mm 45
Boiler length/height mm 104
Fuel Meths
Mechanical Condition Good
Cosmetic Condition Good
Paintwork Original
Packaging
Purchased 7 November 2021
Purchase cost 312
Additional spend