Breakover angle is the maximum possible supplementary angle that a vehicle, with at least one forward wheel and one rear wheel, can drive over without the apex of that angle touching any point of the vehicle other than the wheels.
A catalytic converter is an exhaust emission control device that reduces toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction (an oxidation and a reduction reaction).
Lowering a car’s roof by removing a horizontal section of sheetmetal from the window pillars. Sometimes involves either lengthening the roof or slanting the A-pillars rearward, the C-pillars forward, or both.
The compression ratio (CR) is defined as the ratio of the volume of the cylinder and its head space (including the pre-combustion chamber, if present) when the piston is at the bottom of its stroke to the volume of the head space when the piston is at the top of its travel ('top dead centre', tdc).
Also known as antifreeze, a glycol based liquid that protects engines from overheating when hot and from freezing in cold weather. It also contains lubicants to extend the life of parts like the water pump.
Constant-velocity joints (also known as homokinetic or CV joints) allow a drive shaft to transmit power through a variable angle, at constant rotational speed, without an appreciable increase in friction or play. They are mainly used in front wheel drive vehicles.