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2. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   The amount of power generated by a piston engine is related to its size (cylinder volume), whether it is a two-stroke engine or four-stroke design, volumetric efficiency, losses, air-to-fuel ratio, the calorific value of the fuel, oxygen content of the air and speed . The speed is ultimately limited by material strength and lubrication.

3. Otto cycle - Wikipedia

   en.wikipedia.org/wiki/Otto_cycle

   The first person to build a working four-stroke engine, a stationary engine using a coal gas-air mixture for fuel (a gas engine), was German engineer Nicolaus Otto. [4] This is why the four-stroke principle today is commonly known as the Otto cycle and four-stroke engines using spark plugs often are called Otto engines.

4. File:Four stroke engine diagram.jpg - Wikipedia

   en.wikipedia.org/wiki/File:Four_stroke_engine...

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5. Wikipedia:Picture peer review/4 Stroke Engine - Wikipedia

   en.wikipedia.org/.../4_Stroke_Engine

   #Power stroke - Fuel combusts and piston is pushed downwards. #Exhaust stroke - Exhaust is driven out. This is a large improvement on the existing image; it is higher resolution, has smoother animation and removes some of the unnecessary detail. Articles this image appears in None as yet, but will be on: Engine; Internal combustion engine ...

6. Two- and four-stroke engines - Wikipedia

   en.wikipedia.org/wiki/Two-_and_four-stroke_engines

   Opposed-piston engines have been tried before in both 2 stroke and 4 stroke, the combination of the two different cycles is unique to this engine. The engine has a far greater efficiency over the break-even value known to combustion engines (about 35%) and closer to the one associated with steam turbines or electric engines (about 70%).

7. Miller cycle - Wikipedia

   en.wikipedia.org/wiki/Miller_cycle

   In the Miller-cycle engine, the piston begins to compress the fuel-air mixture only after the intake valve closes; and the intake valve closes after the piston has traveled a certain distance above its bottom-most position: around 20 to 30% of the total piston travel of this upward stroke. So in the Miller cycle engine, the piston actually ...

8. Stroke (engine) - Wikipedia

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

   The induction stroke is the first phase in a four-stroke (e.g. Otto cycle or Diesel cycle) engine.It involves the downward movement of the piston, creating a partial vacuum that draws an air-fuel mixture (or air alone, in the case of a direct injection engine) into the combustion chamber.

9. Firing order - Wikipedia

   en.wikipedia.org/wiki/Firing_order

   For this inline-4 engine, 1-3-4-2 could be a valid firing order.. The firing order of an internal combustion engine is the sequence of ignition for the cylinders.. In a spark ignition (e.g. gasoline/petrol) engine, the firing order corresponds to the order in which the spark plugs are operated.