ASE Auto Maintenance and Light Repair
Terms & Definitions
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Catalyst
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.
Downward gear engagement in which the input shaft and output shaft are locked together; the gearing in the drivetrain in which one turn of the crank shaft equals one turn of the wheel.
They final stroke in a four stroke cylinder engine during which the exhaust valve is open in the intake valve is closed, exhausting the combusted gases.