Automotive Glossary


Automotive Glossary

Browse the glossary using this index

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M

Main Beam

The upper of the two headlamp beams. Also driving beam and upper beam.

Main Bearings

Central journals and bearings on a crankshaft axis mounted in the engine crankcase. The crankshaft rotates in these bearings.

Main Gallery

A tube shaped section cast in to the engine block where other oil feeds are taken from.

Mainline Pressure

The regulated hydraulic pressure in an automatic transmission.

Makeup Air

A system that brings and heats air from the outside to a desired air flow and temperature.

Malleable

Describes a material that means it can be easily shaped.

MAM

Maximum Authorised Mass – The maximum gross weight permissible in GB.


Mandrels

Bars used to locate a component.

Manifold

Pipes or ducting to route air in or burnt gases out of an engine. Attached to the ports.

Manifold Absolute Pressure

The mean gas absolute static pressure in an engine induction manifold. Absolute pressure is equal to gauge pressure plus atmospheric pressure.


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