In-line 3-cylinder engine, there is also a V version with 6 cylinders.

In-line 3-cylinder engine, there is also a V version with 6 cylinders. 
For assembly, you will need: sandpaper or fillets, an elastic band to transfer torsion to the valves (you need one).
IT DOES NOT WORK FROM AIR, IT'S JUST A MOCK-UP!

version v: (just print out this case and the six connecting rods from this folder, and the rest of the models from the "standard version")