Farm Boy
Hit-&-Miss 4-Cycle
Engine Plans
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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) Experience Level: 3
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"Well, for
a "Feller" who has
never had any design
training, you could
put most of them to
shame. You certainly
have some God given
gift at design and
your V-2 proves it.
You are an 'Artist
of Metal.'" - Joe
Sowders (Florrisant,
Missouri)
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