Internal Combustion

Or IC as it sometimes referred
burns the fuel inside the engine.
Your car engine is an internal
combustion engine.

Sears Economy

This stage in the evolution of the IC engine that most people find interesting. 

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The engine I built below is a model based on an engine that Sears, Roebuck and Company sold in the early 1900s.  They were available in sizes from 1hp ($28.95, 320lbs) to 10hp ($231.50, 2450lbs).

I don't have many pictures of this engine in the build process.  This first couple pictures are while I was trying to get it running the first times.  I had to clamp it to the bench because when the hit stroke would happen, it would almost jump across the bench.

Here is a good shot of the governor.  It's the brass weights just left of center.  As the gears spin it, the brass weights fly outward.  They then push a pin through the shaft to the latching lever to hold the exhaust open.

The head before paint.  The top valve is the intake and the bottom is exhaust.  The bar running from the exhaust rocker to the back is the lifter.  There's a cam seen in the above shot on the middle gear that runs the lifter back and forth.  The governor latch is on the lifter in the rear.  You can see it above the yellow clip.  If the latch is engaged, it holds the lifter in the extended position, thus holding open the valve.

This picture is after final painting.  I did the pin striping by hand and they didn't come out great but if you stand back a bit it's not bad. 

Here is a short video of one of the early runs.  Notice how fast it's running.  That's as slow as I could get it at the time.  They require a bit of break in before they start to smooth out.
Economy Video 1

This clip is much smoother but still a bit fast.  I need to work on getting the speed down a bit.