A torsion bar spring connecting the suspension on either side of the vehicle. When a vehicle rolls on the side and a turn, the suspension at the out side wheel compresses and the suspension at the inside wheel extends. The stabilizer bar that connects them twist to apply a counteracting forced to hold the vehicle closer to level.
A plug used to fill holes in a block or head left from the casting process. Also called freeze, welsh or expansion plugs.
A system that provides fresh air to the exhaust system under controlled conditions to reduce emissions. The air source can be a pulse-air pump or an electrical or belt driven pump. Upstream air injection goes into the exhaust manifold to assist in after burning HC laden exhaust gases. Downstream air injection goes into the oxidation bed of the catalytic converter to help oxidize HC and CO emissions.
A compound or substance that can speed up or slow down the reaction of other substances without being consumed itself. In a catalyst converter, special materials platinum or palladium and rhodium in parentheses are used to promote combustion of an burned hydrocarbons and reduce carbon monoxide and nitrogen oxides in the exhaust gases.