|1/2 Scale Plunket Jr.
4-Cycle Gas Engine
Jr. is about a 1/2 scale model of the 1/2 H.P. Plunket Jr. engine
manufactured by the J.E. Plunket Company of Chicago, Illinois around
1909. It was used to power washing machines, sewing machines and other
household chores. It is shown on page 395 of "American Gasoline Engines
Since 1872" by C.H. Wendel.
The model is machined mostly from brass bar stock. You will need a 6"
lathe and at least a medium size milling machine with a 6" diameter
rotary table. Lots of prior shop experience is required. This engine is
not for beginners.
The model runs from 350 RPM idle to around 3,000 RPM or so wide open
and the sound is really neat with the right exhaust pipe at about 900
The plans set consists of 25 sheets of drawings and include a 2-jet
throttle carburetor, water pump, fan and radiator core that I designed
to cool my engine - you will want to design your own radiator housing,
piping and fuel tank. Plus, there are 2 sheets of construction and
Flywheel Dia.: 5", Cylinder Bore: 1",
Piston Stroke: 1-1/2", Overall Length: 10-1/2" Experience
your plans, thanks. Excellent quality. They are much better than the
usual sort of rubbish I find in the UK." - Danny Quinlan (Brentwood,