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An 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 .
A camless or free-valve piston engine is an engine that has poppet valves operated by means of electromagnetic, hydraulic, or pneumatic [1] actuators instead of conventional cams. Actuators can be used to both open and close valves, or to open valves closed by springs or other means.
The most common use of a rocker arm is to transfer the motion of a pushrod in an overhead valve (OHV) internal combustion engine to the corresponding intake/exhaust valve. In an OHV engine the camshaft at the bottom of the engine pushes the pushrod upwards. The top of the pushrod presses upwards on one side of the rocker arm located at the top ...
A crossflow head gives better performance than a Reverse-flow cylinder head (though not as good as a uniflow), but the popular explanation put forward for this — that the gases do not have to change direction and hence are moved into and out of the cylinder more efficiently — is a simplification since there is no continuous flow because of valve opening and closing.
Cutaway of a dual overhead camshaft engine 1969 AMC V8 overhead valve engine. The rocker cover has been removed, so the pushrods, rocker arms, valve springs, and valves are visible. A valvetrain is a mechanical system that controls the operation of the intake and exhaust valves in an internal combustion engine. [1]
Marcus C Inman Hunter: "Rotary Valve Engines", Hutchinson, 1946 (In Scribd) G F Hiett and J VB Robson: "A High-Power Two-Cycle Sleeve-Valve Engine for Aircraft", Aircraft Engineering and Aerospace Technology (1950), Vol 22, Iss 1, pp. 21–23, same authors, magazine and title, 2nd part, in Vol 22, Iss 2, pp. 32–45
In an overhead valve engine the tappets (on right) are sandwiched between pushrods and the camshaft. In an internal combustion engine, a tappet (also called a 'valve lifter' or 'cam follower') [3] [4] [5] is the component which converts the rotation of the camshaft into vertical motion to open and close an intake or exhaust valve.
Overhead valve → – 1: The subject is a type of engine, not a type of valve. 2. The subject does not cover all overhead valve engines, just those with valves operated by pushrods. 3. The title "OHV engine" is more in line with "Flathead engine" and "IOE engine". Sincerely, SamBlob 00:18, 26 February 2015 (UTC)