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Lean Mixture

An air/fuel mixture with too much air.

Lean On It

A term often used for a lay on it, or lay on the iron.

Lean Out

1. To increase the portion of air or decrease the portion of fuel in an air/fuel mixture. 2. To decrease the portion of nitro in a fuel mixture.

Lean Roll

To turn carburetor idle-mixture screws in enough to effect a slight rpm drop, causing a leaner mixture.

Leaner And Later

Early calibration strategies for air/fuel mixture and ignition timing to reduce HC and CO formation.

Leaver

A drag-race driver that red lights by leaving the line too soon.

LED

Light emitting diode.

Left-hand Thread

A thread pattern on a bolt or nut that requires it to be turned to the left or counter-clockwise for tightening.

Leg It

To go fast.

Leg Out Of Bed

A connecting rod that has broken through on a cylinder block wall.

Lemon

A vehicle, generally a new one, with several defects or a defect that can't be resolved.

Lemon Law

Federal and state laws that assure customer satisfaction for repairs to new vehicles by the dealer or replacement by the manufacturer.

Length-to-diameter Ratio

The ratio of a coil-spring wire diameter to its overall length, a measure of the spring's effectiveness.

Lenz's Law

Hinrich Lenz ( 1804 - 1865 ) A Russian Physicist who in 1833 formulated Lenz's Law, a fundamental law of electromagnetism He also found that the strength of a magnetic field is proportional to the strength of the magneric induction.

LEV

Low emissions vehicles.

Level

1. To be on a horizontal plane. 2. The amount of liquid in a system.

Level Control

A term used for automatic level control.

Leverage

The use of a lever and fulcrum to create a mechanical advantage, usually to increase force applied to an object. The brake pedal is the first point of leverage in a vehicle brake system.

Lexan

The trade name for the shatterproof, heat-resistant clear plastic used in race-car rear windows.

LFC

Low fan control.