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.
Camshaft Location: The camshaft in generally located in the cylinders head or engine block. Car engines which have the camshaft located in the cylinders head are called overhead cam (OHC) engine. There are two types of overhead cams engines they are Dual overhead cam and Single overhead cam. A dual overhead cam (DOHC) engine uses two camshafts, one for the intake valves and the other for the exhaust valves.