FILENAMES:

JD1.jpg
JD2.jpg
JD3.jpg
JD4.jpg

DESCRIPTION:

These are pictures of a model of a John Deere engine. Posted 
by Chuck Fellows <cdfellows@home.com>. Chuck provided the 
following description:

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Model John Deere Engine

The pictures JD1 thru JD4 show a model John Deere Engine I just 
completed. It's somewhat stylized and it runs on compressed air, 
but it sounds pretty much like a John Deere twin cylinder engine 
from the forties.

The construction is mostly steel with a little brass here and 
there as shown.  It has 3/4" bore and 7/8" stroke, overhead intake 
valves of the poppet style and a separate camshaft that runs off 
the crankshaft through gearing. Both the crankshaft and camshaft 
run in ball bearings.  

Unlike its larger counterpart which fires twice in two revolutions, 
this engine "fires" twice every revolution.  The crankshaft journals 
for the connecting rods are 90 degrees apart so the engine has the 
synchopated sound of the original.  The exhaust is through holes in 
the cylinder wall at the bottom of the stroke which gives it a nice 
putt-putt sound.

Sorry, no drawings for it yet.

Chuck Fellows