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A rocker arm is a valvetrain component that typically transfers the motion of a pushrod in an overhead valve internal combustion engine to the corresponding intake/exhaust valve. Rocker arms in automobiles are typically made from stamped steel, or aluminum in higher-revving applications.
In a push-rod system, the rocker arms are placed at the highest point in the assembly. As such, the rod is under pressure as it transfers compression forces upwards into the rocker arms. In a pull-rod system however, the rocker arms are located between the upper and lower control arms, at the centre of the assembly. As such, the rod is under ...
Commonly, springs are mounted on control arms, swing arms or some other pivoting suspension member. Consider the example above, where the spring rate was calculated to be 500 lbs/inch (87.5 N/mm), if one were to move the wheel 1 in (2.5 cm) (without moving the car), the spring more than likely compresses a smaller amount.
In a single overhead camshaft (SOHC) engine, the camshaft may be seated centrally between valve rows, or directly above a single row of valves (replacing rocker arm actuation with tappets). SOHC engines were widely from the 1960s to 1990s. (eliminating pushrods but still utilizing rocker arms)
Intended to deal with the troubles created by the low-production 426, of which only about 9,000 were built from 1966 to 1972), [4] as well as the different architectures of the higher-volume 383 cu in (6.3 L) and 400 cu in (6.6 L) B and 440 cu in (7.2 L) RB V8s, the ball-stud hemi was to be suitable for high-volume manufacture at low cost while ...
Cast iron exhaust manifolds, less restrictive than units found on previous engines, were bolted to the outboard side of each head. The new cylinder heads also featured stud-mounted rocker arms, a change from the shaft-mounted LA arms. This last change was due to the different oiling system of the new engine, as described in the next paragraph. [10]
Stamped ball-pivot stud-mounted rocker arms were introduced, similar to the V8, with a 1.75:1 ratio, rather than the earlier shaft-mounted 1.477:1 rockers. The first use of the new engine series was the 194 cu in (3.2 L) Hi-Thrift version in the 1962 Chevy II ; the following year, Chevrolet passenger cars adopted the 230 cu in (3.8 L) version ...
A 1981 Datsun 210 has an 8 valve pushrod engine and has 25 components acting on the valves (1 cam, 8 tappets, 8 pushrods, 8 rocker arms), not including the drive system. Quite a difference wouldn't you say?
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