Overhead valve engineAn overhead valve engine, abbreviated (OHV) and sometimes called a pushrod engine, is a piston engine whose valves are located in the cylinder head above the combustion chamber. This contrasts with flathead (or "sidevalve") engines, where the valves were located below the combustion chamber in the engine block.
Overhead camshaft engineAn overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion chamber in the engine block. Single overhead camshaft (SOHC) engines have one camshaft per bank of cylinders. Dual overhead camshaft (DOHC, also known as "twin-cam") engines have two camshafts per bank.
ValvetrainA valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. The intake valves control the flow of air/fuel mixture (or air alone for direct-injected engines) into the combustion chamber, while the exhaust valves control the flow of spent exhaust gases out of the combustion chamber once combustion is completed. LayoutThe valvetrain layout is largely dependent on the location of the camshaft.
Engine knockingIn spark-ignition internal combustion engines, knocking (also called knock, detonation, spark knock, or pinging) occurs when combustion of some of the air/fuel mixture in the cylinder results from a source other than the flame front ignited by the spark plug, in other words, when one or more pockets of air/fuel mixture explode outside the envelope of the normal combustion front.
Cylinder headIn a piston engine, the cylinder head sits above the cylinders, forming the roof of the combustion chamber. In sidevalve engines the head is a simple plate of metal containing the spark plugs and possibly heat dissipation fins. In more modern overhead valve and overhead camshaft engines, the head is a more complicated metal block that also contains the inlet and exhaust passages, and often coolant passages, valvetrain components, and fuel injectors.
TappetA tappet or valve lifter is a valve train component which converts rotational motion into linear motion in activating a valve. It is most commonly found in internal combustion engines, where it converts the rotational motion of the camshaft into linear motion of intake and exhaust valves, either directly or indirectly. An earlier use of the term was for part of the valve gear in beam engines beginning in 1715.
Internal combustion engineEngine in which fuel combusts with an oxidizerDiagram of a cylinder as found in an overhead cam 4 stroke gasoline engine: C – crankshaftE – exhaust camshaftI – inlet camshaftP – pistonR – connecting rodS – spark plugV – valves.
Cam-in-blockA cam-in-block engine is where the camshaft is located in the engine block. Types of cam-in-block engines are: F-Head EngineFlathead engineOverhead valve engine (the only type where the valves are above the combustion chamber)T-head engine This includes a list of related items that share the same name (or similar names). If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article.
Poppet valveIn internal combustion engines, a poppet valve (also sometimes called mushroom valve) is a valve typically used to control the timing and quantity of petrol (gas) or vapour flow into or out of an engine, but with many other applications. It consists of a hole or open-ended chamber, usually round or oval in cross-section, and a plug, usually a disk shape on the end of a shaft known as a valve stem.
Aircraft engineAn aircraft engine, often referred to as an aero engine, is the power component of an aircraftpropulsion system. Aircraft using power components are referred to as powered flight. Most aircraft engines are either piston engines or gas turbines, although a few have been rocket powered and in recent years many small UAVs have used electric motors.
D-MotorD-Motor is a Belgianaircraft engine manufacturer based in Deerlijk. The company specializes in the design and manufacture of aircraft engines for homebuilt and ultralight aircraft. The company was formed in about 2009 to develop an engine to replace the Rotax 582 and Jabiru 2200 in the Belgian Masquito M80 helicopter project. The resulting engine was first shown in 2010 in Brussels, Belgium and at the 2010 AERO Friedrichshafen show in Germany.
ValveA valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In an open valve, fluid flows in a direction from higher pressure to lower pressure.*As an Amazon Associate I earn from qualifying purchases.