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Automotive Dictionary


N - Z



With a Muscle Car Club membership, you will have full access to our entire dictionary section! Below is a sample of what you will receive.

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Naturally Aspirated: Refers to an engine that does not use any form of forced induction to achieve more performance.

Neutral Steering: A condition in which the slip angle of the front and rear wheels are the same.

Nitrous Oxide (NO2): Nitrous oxide is a compound that is made up of two parts oxygen to one part nitrogen. A gas at room temperature and a liquid under pressure. When heated, it breaks down into its two elements. Often used in racing as a source of compressed air that can be forced into the motor for short periods of greater power.

NOS: Brand name/logo for Nitrous Oxide Systems



 Octane Rating: A unit of measurement on a scale intended to indicate the tendency of a fuel to detonate or knock based on the percentage of isooctane in the fuel. The higher the rating, the higher the percentage of isooctane and therefore the greater the resistance to detonation offered by the fuel.

Overdrive: A gear set in which the output shaft rotates faster than the input shaft, i.e. the highest gear ratio is less than a one-to-one ratio. The overdrive feature saves fuel and, because the engine runs slower, engine wear and noise are reduced.

Overhead Cam: The type of valve train arrangement in which the engine's camshaft is mounted above the cylinder head(s). When the camshaft is placed close to the valves, the valve train components can be stiffer and lighter, allowing the valves to open and close more rapidly and the engine to run at a higher RPM. In a single overhead cam (SOHC) layout, one camshaft actuates all of the valves in a cylinder head. In a dual overhead camshaft (DOHC) layout, one camshaft actuates the intake valves, and one camshaft operates the exhaust valves.

Overhead Valve Engine (OHV): An engine with both intake and exhaust valves placed directly over the piston. In this design, the camshaft is located in the block, and the valves are actuated by pushrods and rocker arms.

Oversteer: Where the slip angle of the rear wheels are greater than that of the front wheels. The rear tires lose grip before front tires do. Happens more often in rear wheel drive cars.








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