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2. Piston ring - Wikipedia

   en.wikipedia.org/wiki/Piston_ring

   A piston ring is a metallic split ring that is attached to the outer diameter of a piston in an internal combustion engine or steam engine. The main functions of piston rings in engines are: Sealing the combustion chamber so that there is minimal loss of gases to the crank case.

3. Cylinder (engine) - Wikipedia

   en.wikipedia.org/wiki/Cylinder_(engine)

   A piston is seated inside each cylinder by several metal piston rings, [1] which also provide seals for compression and the lubricating oil. The piston rings do not actually touch the cylinder walls, instead they ride on a thin layer of lubricating oil.

4. Piston - Wikipedia

   en.wikipedia.org/wiki/Piston

   Pistons of Hydraulic cylinders used in a hot press. Hydraulic cylinders can be both single-acting or double-acting. A hydraulic actuator controls the movement of the piston back and/or forth. Guide rings guides the piston and rod and absorb the radial forces that act perpendicularly to the cylinder and prevent contact between sliding the metal ...

5. Break-in (mechanical run-in) - Wikipedia

   en.wikipedia.org/wiki/Break-in_(mechanical_run-in)

   The goal of modern engine break-ins is the settling of piston rings into an engine's cylinder wall. A cylinder wall is not perfectly smooth but has a deliberate slight roughness to help oil adhesion. As the engine is powered up, the piston rings between the pistons and cylinder wall will begin to seal against the wall's small ridges. [1]

6. Piston valve (steam engine) - Wikipedia

   en.wikipedia.org/wiki/Piston_valve_(steam_engine)

   Diagram of cylinder and piston valve. The valve is next opened by moving it to the right, allowing the clear space in the middle of the valve to align with the channel in the cylinder above it. Piston valves are one form of valve used to control the flow of steam within a steam engine or locomotive.

7. Power assembly - Wikipedia

   en.wikipedia.org/wiki/Power_assembly

   Piston and piston rings; Piston carrier; Connecting rod; In an EMD diesel engine, since two power assemblies share a common connecting-rod journal, and since the power assemblies are directly opposite each other rather than staggered as in a typical V-type engine, two different power assemblies are required in a single engine.

8. Two-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Two-stroke_engine

   However, a mechanical limit exists to the width of a single exhaust port, at about 62% of the bore diameter for reasonable piston ring life. Beyond this, the piston rings bulge into the exhaust port and wear quickly. A maximum 70% of bore width is possible in racing engines, where rings are changed every few races.

9. Squish (piston engine) - Wikipedia

   en.wikipedia.org/wiki/Squish_(piston_engine)

   This is the most common way to create a squish piston engine because it is the smallest and easiest part to manufacture. These pockets can be made by making a recess in the piston crown. This is called a deep bowl piston. [3] Others may use raised areas relative to the piston rings to create a different effect in the combustion chamber.