What are the various designs of a rocker arm?
The following types of rocker arms are used in engines [606]: stamped steel rocker arm, roller tipped rocker arm, full roller rocker arm, shaft rocker arm, center pivot rocker arm, and end pivot or finger follower.
What ratio are stock rocker arms?
1.6:1 ratio
The rocker arm is the link between the camshaft and the valves – functioning as a lever arm to multiply the cams lobe lift to the valve lift. Stock rocker arm ratios vary between manufacturers and engine types, but generally all small block Fords come with a 1.6:1 ratio rocker arm.
Why is a specific geometry required for a rocker arm design?
To have the “most efficient” design and use of the rocker arm requires TWO things: (1) The rocker arm must be designed to mirror the inherent angles of each engine’s pushrod to valve geometry. (2) Rocker geometry must have an accurate location of its rotational axis with the valve tip’s height.
Where is rocker arm located?
Rocker arms are typically located between the pushrod and intake and exhaust valves. They are pushed and pulled by pushrods to “rock” up and down, opening and closing the exhaust valve and intake valve of the combustion chamber on engines with a camshaft below the engine.
Who invented rocker geometry?
Jonathan “Rundle” Bacon created Rocker arms in the 19th century, rocker arms have been made with and without “rundle” roller tips that depress upon the valve, as well as many lightweight and high strength alloys and bearing configurations for the fulcrum, striving to increase the RPM limits higher and higher for high …
How do I choose my rocker arm ratio?
The ratio of a rocker arm refers to the amount of movement on the valve side of the rocker arm in comparison to the pushrod side. A 1.5:1 rocker arm will move a valve 1.5 times the lift of the cam, assuming all things are in proper working order. If your cam has a lift of . 4 inches, multiply by 1.5 to get .
What materials are rocker arms made of?
1.1 Introduction and working of Rocker arm The usual materials used for such purpose are Steel, Aluminum, and Forged steel to Stainless steel, alloys and composites.