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Thursday, 25 April 2024, 12:12 PM
Site: IMI eLearning
Course: IMI eLearning (IMI eLearning)
Glossary: Automotive Glossary
R

RHD

Right-Hand Drive

Rheostat

A type of variable resistor having only two terminals.

Rich Fuel/Air Mixture

A fuel/air mixture with a ratio greater than the stoichiometric ratio of 14.7:1. A mixture strength with an excess of fuel.

Rim

Outside edge, periphery. Part of wheel carrying the tyre.

Ring Gear (Starter)

A large diameter gear wheel mounted on the engine flywheel or torque converter flex plate and used to engage with the starter motor drive pinion to start the engine.

Ring Groove

Slot cut round the piston for the piston rings to sit in.

Ring Land

Seating area for piston rings.

RIRO

Rubbish In Rubbish Out. In relation to the Internet.

Road Adhesion

Grip between the tyres and the road surface.

Rocker

A component such as a lever to operate a valve due to action of a cam.