Farmboy Hit-&-Miss 4 Cycle Engine Plans PDF
Plans to build the Farm Boy Hit-&-Miss 4-Cycle Engine 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) All of our plans projects are machined from metal bar stock (supplied by you, the builder) and no castings are required. This is the lowest cost way for you to build as the metals can usually be purchased from metal salvage yards for around $2.00 or so per pound for aluminum, brass and stainless steel. But as can be seen, most of the model engines are designed to look like they were in fact made from castings instead of rectangular blocks and round bars of metal. High precision machining is required. Experience building other types of engines from scratch is suggested.You will need a lathe and a milling machine with the usual tooling items. You will need a horizontal/vertical rotary table for your mill if you want to duplicate the visual design aspects of some of the projects – spoked flywheels, fluted columns etc., but the engines will operate just as well without those features. Please note – we do not have any ready to run engines or bolt together engine kits for sale. The plans are for model engines – the engines can be scaled to any size, but no claims of suitability for practical power generation are made.The Plans Set drawings are high quality computer generated drawings using a professional CAD (Computer Aided Design) program and printed on 8-1/2″ x 11″ sheets with a laser printer. This permits you to insert them in plastic sheet protectors so they won’t get soiled as you use them in the shop. Dimensions are in U.S. inch decimals – no fractions – which makes it easy for you to change the scale of your model to suit your machine tool capacity or the materials you have on hand or have access to. Multiply dimensions by 25.4 to obtain millimeter dimensions. NOTE: If you want your plans right away, send us a message with your email address and we will email you a link to download a PDF of the plans. If you are successful in downloading, we will cancel mailing of the hard copy and refund 80% of the eBay shipping cost.We are the owners of this copyrighted material. Sale or giving away our plans is strictly prohibited!
