Farm Boy Hit-&-Miss 4-Cycle Engine Plans

Farm Boy is a bar stock engine requiring no expensive castings but is designed to look as though it was made from castings. As seen above, it is not possible to know it was made from bar stock. It is mostly aluminum alloy which is much stronger than castings and machines better as well. As a hit-&-miss type engine it needs no cooling system and will operate for long periods on a small amount of fuel. Running time is 12 hours on 2 ounces (59cc) of fuel. Even after all day runs the engine only gets slightly warm. The engine is not difficult to build, yet offers some interesting challenges to keep an experienced builder interested. Farm Boy is designed to use an "O" ring on the piston instead of normal cast iron piston rings (the builder can use cast iron rings if desired). This results in near perfect compression from the first run and because there is very little cylinder friction, Farm Boy will coast from 20 to as many as 30 revolutions between firing.

The plans set consists of 19 sheets of quality laser printed CAD drawings and 2 sheets of construction notes.

Specifications: Cylinder Bore: 1" (25.4mm), Piston Stroke: 1-3/8" (34.9mm), Flywheel Diameter: 6" (152.4mm), Engine Length: 10.75" (273mm), Engine Height: 6" (152.4mm), Engine Width: 6.9" (175mm) 

Difficulty Level:    Easiest (1...2...3...4...5...6) Hardest