Current testing requirements for high temperature alloys are defined in general industry specifications (ASTM, AMS), as well as in user specifications. Many of these requirements were established in the 1960's when production practices were yet to be refined.
cowling - protective covering consisting of a metal part that covers the engine; there are powerful engines under the hoods of new cars; the mechanic removed the cowling in order to repair the plane's engine.
Therefore, a car engine is an internal combustion engine -- combustion takes place internally. Two things to note: 1  There are different kinds of internal combustion engines. 2  Diesel engines are one form and gas turbine engines are another. 3  See also the articles on HEMI engines, rotary engines and two-stroke engines.