||Grey iron is a cast iron that contains carbon in the form of graphite, plus silicon, manganese and phosphorus.
||Turbulence refers to the swirling motion of a liquid or a gas.
||The time valves in a 4-stroke engine cycle actually open and close can be measured by angles. These angles can be easily read using a valve-timing diagram.
|Compression ratio||An engine’s compression ratio can be a guide to the power it can generate, the higher the engine's compression ratio and the more powerful the engine.|