Work is done on the air/fuel mixture as the piston moves to TDC ... The power stroke extracts work from these gases as they expand and force the piston to BDC. In the exhaust stroke, the exhaust valve ...

In the test, you blow air past the partly open exhaust valve and outward through ... pressure is available to drive the ...

Instead of trying to make an air-tight piston, he added a rubber membrane and a clever valve system to create a diaphragm air engine. This GIF is worth 115 words A round rubber diaphragm with a ...

Symbols are used to represent the air supply (pressure source) and the exhaust in a circuit ... This means that either valve X OR Y can be pressed to make the piston go positive.

[Camden Bowen] recently 3D printed a single-piston engine which nearly ... of time over several starts, the valve train suffered some damage with the exhaust valves melting in place to the head.