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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 .
An overhead camshaft (OHC) engine is a piston engine in which the camshaft is located in the cylinder head above the combustion chamber. [1] [2] This contrasts with earlier overhead valve engines (OHV), where the camshaft is located below the combustion chamber in the engine block. [3]
Gasoline engines up to WWII were often valve in block design (L-head), during the war more overhead valve (ohv) engines were used, and after the war all new engines (except 1 F-head and 1 Overhead camshaft (ohc)) have been ohv. All diesel engines have ohv, they can be naturally aspired, supercharged (SC), or turbocharged (TC).
This OHV (overhead valve) engine was produced through 1953. With a cylinder bore of 3.5625 inches (90.49 mm), this is the smallest low-deck engine. All four low-deck engines have a stroke of 3.8125 inches (96.84 mm) and used 7 inch long connecting rods.
By 1952 Ford had new, 215 cu in (3.5 L) OHV 6-cylinder engine and Lincoln had a 317 cu in (5.2 L) OHV V8. [1] The company had designed the Y-block for a 1953 introduction, but a shortage of nickel due to the Korean War 's needs prevented the company from manufacturing the engine in sufficient quantities, [ 2 ] delaying it until 1954.
The High Value engine family from General Motors is a group of cam-in-block or overhead valve V6 engines.These engines feature cast iron blocks and aluminum heads, and use the same 60° vee bank as the 60° V6 family they are based on, but the new 99 mm (3.90 in) bore required offsetting the bores by 1.5 mm (0.059 in) away from the engine center line.
A 1964 Rambler American with a 195.6 OHV engine. American Motors' first straight-six engine was the 196 cubic inch (195.6 cu in (3.2 L)) six produced from 1952 through 1965, initially as a flathead (L-head) side-valve, and later an overhead valve (OHV) version.
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 ...