Howell V-Four – 4 Cycle Gas Engine Plans PDF
Plans to build a Howell V-Four, 4 Cycle Gas Engine The engine is 1.95 Cu. In. (32cc) in displacement. Cylinders are 90 degrees apart in order to have the engine balanced for vibration free running. The cylinder bore is .875″ and the piston stroke is .812″. The cylinder banks are not staggered and robust knife and fork connecting rods are used. The multi segment built-up crankshaft and twin cam shafts are amazingly easy to make. A Hall Effect distributor is driven off the end of one of the cam shafts. The distributor body is linked to the throttle arm for spark advance/retard with the throttle setting. The throttle is my newest proven 2-jet design with an oiled foam air cleaner. Pressure lubrication to the rod ends is by an external gear oil pump which feeds oil through the drilled crankshaft. There is an oil pressure adjuster and an oil pressure gauge port. The engine is water cooled using my unique magnetic drive water pump which has no seals to leak, and a proper looking and effective shop made radiator. The fan blade shroud insures that the 5 curved blade fan actually pulls air through the radiator fins and not just circulate the air around behind the radiator as would otherwise result without one. There are ball bearings on the crankshaft, timing gears, camshaft, distributor, rocker arms, water pump, oil pump and fan shaft. All external parts are sealed using “O” rings which prevent any oil seepage from the engine. A crankcase vent/check valve maintains negative crankcase pressure. A dipstick is provided to monitor the oil level and also an easy to get to oil drain plug. Checking the RPM with a Laser Digital Tachometer on initial test runs show an idle speed of approximately 1,000 RPM and a top speed of 6,500+ RPM. Both of these are expected to improve after the engine is fully broken-in.This is NOT a beginners project, but anyone who is particular about his work, has built a few other successful internal combustion engines and has a 7 inch or larger lathe and a milling machine with a 6 inch rotary table should not have any problems building this engine.The plans set consists of 65 detailed sheets of quality laser printed CAD drawings and 5 sheets of Construction Notes. Every feature of the engine as shown is included in the plans set including 2-Jet Throttle, Air Cleaner, Water Pump, Oil Pump, Hall Effect Distributor, Radiator, Skid, Etc. EXCEPT the stainless steel exhaust pipes and manifolds. A full-size drawing of the manifolds is included but does not contain dimensions. A new page with manifold dimensions is pending, however, we have no estimated completion date.The Howell V-Four is the Sherline Craftsmanship Museum Group Build EngineSpecifications: Flywheel Diameter: 3″, Height on Skid: 7.07″, Overall Width: 5.75″, Length w/Radiator: 7.6″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.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!
