Miss Frown Porh

article image

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

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.)

Gas Engine Magazine
Gas Engine Magazine
Preserving the History of Internal Combustion Engines