Wiktionary (0.00 / 0 votes) Rate this definition: sultan (Noun). Originally, a secular office, formally subordinate to -, but de facto the power behind the throne of the (theoretically universal) caliph. hereditary ruler in various Muslim states (sultanate), varying from petty principalities (as in Indonesia and in Yemen), often vassal of a greater ruler, to independent realms, such as Oman, Brunei, or an empire such as the Turkish Ottoman Empire.
Rocker arm. A rocker arm (in the context of an internal combustion engine of automotive, marine, motorcycle and reciprocating aviation types) is an oscillating lever that conveys radial movement from the cam lobe into linear movement at the poppet valve to open it.hen the camshaft lobe raises the outside of the arm, the inside presses down on the valve stem, opening the valve. When the outside of the arm is permitted to return due to the camshafts rotation, the inside rises, allowing the valve spring to close the valve.
Assembling the perfect valve train combination is challenging for even the most seasoned engine builders because there are so many variables involved. One area of the valve train that many people have difficulty with is selecting the perfect rocker arms. With a wide variety of options available, it can be hard to know which rocker is the best choice for your application. âWhich rocker is right for me?â is a question that the technicians at COMP Cams are asked every day. The three most important factors in deciding which rocker arm is right for your application are valve spring diameter (pressure), RPM range and valve lift.