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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 .
This reduced inertia in OHC engines results in less valve float at higher engine speeds (RPM). [1] A downside is that the system used to drive the camshaft (usually a timing chain in modern engines) is more complex in an OHC engine, such as the 4-chain valvetrain of the Audi 3.2 or the 2 meter chain on Ford cammers. Another disadvantage of OHC ...
2.5 L; 152.5 cu in (2,499 cc) straight-four, with two (pushrod-actuated) valves-per-cylinder and indirect fuel injection. 92 mm × 94 mm (3.62 in × 3.70 in), the engine size is variably referred to as either 2,500 or 2,499 cc. This engine too has been called HR 492, signifying four cylinders of 92 mm (3.62 in) bore. Timing gears, not belt.
The Jeep Tornado engine was the first post-World War II U.S.-designed mass-produced overhead cam (OHC) automobile engine. [1] The 230.5 cu in (3.78 L) hemi-headed straight-six was introduced in mid-year 1962, and replaced the flathead "6-226" Willys Super Hurricane that was in use since 1954.
Pushrods are long, slender metal rods that are used in overhead valve engines to transfer motion from the camshaft (located in the engine block) to the valves (located in the cylinder head). The bottom end of a pushrod is fitted with a lifter, upon which the camshaft makes contact. The camshaft lobe moves the lifter upwards, which moves the ...
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 ...
Although a powerful engine for its time, the 16 Valve engine can experience some problems that can be solved easily. One of the few problems is oil pump gear problems leading to broken timing belts. The oil pump gear itself can fail around the mounting flange, or, more often, the weak 8.8 (grade 5) grade bolt holding the gear can break.
A single camshaft located in the engine block uses pushrods and rocker arms to actuate all the valves. OHV engines are typically more compact than equivalent OHC engines, and fewer parts mean cheaper production, but they have largely been replaced by OHC designs, except in some American V8 engines.
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