Miss Frown Porh

Little hit &. miss engine

Content Tools

1416 Ralapen Street, Roxboro, North Carolina 27573

Being a person who hates to throw things away, I decided to build this little hit &. miss engine from some old Briggs WI parts lying around. Everything else is either shop scrap or came from a hardware store, except the baby food jar lubricator and pork and beans can gas tank.

The engine block was cut down to a minimum and all casting and bosses ground smooth. Because of the lower deck height, a different connecting rod was fabricated from a piece of aluminum cut off of an old car air conditioning bracket. The cylinder head is made from a piece of ?' plate and half a 2' pipe cap using the Briggs ?' valves, and drilled and tapped 10MM for a small chain saw spark plug. Somehow I got all of this in an area slightly less than 2' in diameter.

Exhaust valve timing is accomplished by nuts and bolts, flat bar, and a couple of pieces of angle iron. Carburetor and exhaust manifold are 3/8' brass pipe fittings with an air adjuster and muffler fabricated from pipe caps. All the plumbing for the lube and fuel systems is 1/8' tubing and fittings. It was necessary for me to fill the fittings with solder and drill them different sizes for even distribution of oil and proper air-fuel ratio. The oiling system is the drip-total loss type and I catch the oil and recycle it two or three times before it gets too dirty. Fuel is vacuum feed with a homemade check valve in the gas tank.

Ignition consists of Briggs points, Volkswagen condenser, Honda motorcycle coil, and a 12 volt battery pack using 8 AA batteries. All but the points are concealed under the base. The governor is of the ground interrupt type and made from 1?' and ?' brass round stock, banding strap and a 2?' v-belt pulley also used to start the engine. You use what you got- right?

The pulley on the flywheel drives a 4' cooling fan with an O-ring. This has been removed to take the photos. With a 6:1 compression ratio the engine starts easily and the governor holds it at about 600 rpm, firing intermittently like hit & miss. Under a load it runs smoothly at 200-300 rpm. For some reason this engine is real noisy for its size and I did away with the original straight pipe and put the muffler on.

This little engine was a lot of fun to build and it was really popular at an engine show I recently attended. And, it was all done with ordinary hand tools except for the welding on the cylinder head. (Photos taken by my friend Paul Stewart.)