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.
Everybody knows that more rocker ratio will increase valve lift. Theory says if you replace a stock 1.5:1 rocker arm with a 1.6:1 rocker, valve lift will increase throughout the lift curve.Let's take a small-block cam with a max valve lift of 0.450 inch with a 1.5:1 rocker arm.Install a 1.6:1 rocker and the max valve lift jumps to 0.480 inch. That's a healthy 0.030-inch increase in valve lift.But there are overlapping schemes working here that deserve to be investigated.he opposite of the weak stock rockers are the Crane Nitro Carb stamped-steel, long-slot, 1.6:1 rocker arms. At first we were skeptical that a stamped rocker could maintain that ratio. However, when we tested several Crane rockers, we discovered that they exceeded the 1.60 ratio in almost every case.