A gear system, consisting in basic form of an internally toothed annulus or ring gear and a central externally toothed sun wheel, with usually three or four planet wheels or gears meshing with the sun wheel and annulus. The planet wheels are often carried as a unit on a planet carrier or spider. Holding the rotation of the planet carrier, annulus or sun wheel will provide a transmission ratio between the two remaining elements. Planetary gear sets can be coupled to increase the available number of ratios.

An epitrochoid is a shape traced by a point attached to a circle of radius r rolling around the outside of a fixed circle of radius R, where the point is a distance d from the centre of the exterior circle. It is the shape of the cylinder in a Wankel engine.

EGR Valve Position Sensor

A type of paint, adhesive or plastic noted for high mechanical strength, good adhesion and excellent chemical resistance.

Erasable Programmable Read Only Memory.

Exhaust Electronic Pressure Transducer.

Electronic Spark Control

Electronic Spark Timing

A type of organic compound used as active solvents.

An opinion or judgement.