Today, I've taken all the parts I introduced over the past week or so, and have put them together into a model Lego Technic engine. While the engine doesn't burn gasoline, it is fully functional otherwise.
Notice the offset of the pistons in the cylinder casings. That comes from the bent crankshaft, a small part of which you can see in the above picture.
Front view of the engine. That axle in the center is connected to the crankshaft; turn the axle, the crankshaft turns, moving the pistons up and down.
Bottom view, showing the crankshaft and pistons in more detail. The red bricks are another useful type of Lego brick, which I'll talk about in a future BOTD.
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