ocr: JRIFICE In this contest, an oritice is a small passage of precise umensions used to control the flow of fuel. In a carburator, for eHample, orifices are used to control Idle and Main Jet fuel flows. P-U DIAGRAM AP-U or Pressure-volume diagram is a method of showing the relationships of piston position, and pressure in a reciprocating engine or pump. Also known as an indicator Jiagram, when indicator recorders were used to measure engine performance. RETARDER AI braking system which uses either modified valving in the engine (ususally Diesel) or a separate brake hydraulic turbine or electric ge ...
