A
- approach angle: The steepest incline a vehicle can ascend without its front bumper or undercarriage contacting the ground.
- ARB: A renowned Australian manufacturer of 4×4 accessories, including the famous Air Locker differential.
- articulation: The capability of a vehicle’s suspension to flex, allowing the wheels to maintain ground contact on uneven terrain.
B
- back cut: The specific angle at which engine valves are cut to improve airflow and enhance performance.
- bead: The edge of a tyre that interfaces with the wheel rim, ensuring a secure fit and maintaining tyre inflation.
C
- camshaft: A rotating shaft in the engine that opens and closes the intake and exhaust valves at the correct times.
- carrier: The component within a differential that houses the gears and allows the axles to turn.
- caster angle: The angle of the steering pivot line, viewed from the side, affecting the vehicle’s handling and stability.
D
- differential: A gear assembly that enables the wheels on an axle to rotate at different speeds, crucial for turning.
E
- e-locker: An electronically controlled locking differential that enhances traction by locking both wheels on an axle together.
- engine torque: The rotational force produced by an engine’s crankshaft, contributing to a vehicle’s acceleration and towing capability.
F
- four-link: A suspension system with four control arms that manage the axle’s position and movement, providing stability and flexibility.
- full-floater: An axle design where the axle shafts only transmit driving torque and do not support the vehicle’s weight.
G
- gear ratio: The ratio between the number of rotations of the pinion gear to one rotation of the ring gear, affecting acceleration and top speed.
- ground clearance: The height between the lowest point of the vehicle and the ground, important for off-road navigation.
H
- high-centre: When a vehicle becomes stuck on an obstacle with all four wheels off the ground, often due to insufficient ground clearance.
- horsepower: A measure of engine power, indicating the rate at which the engine can perform work.
I
- IFS: Independent Front Suspension, a system where each front wheel moves independently, improving ride comfort and handling.
- intake manifold: A component that distributes the air-fuel mixture to the engine’s cylinders.
J
- jeep: Originally a military general-purpose vehicle, now a brand known for its rugged off-road capabilities.
K
- kinetic recovery rope: A rope with elastic properties used to recover a stuck vehicle by utilising the energy stored in the rope’s stretch.
L
- leaf springs: Layers of metal strips used in vehicle suspension, providing support and absorbing shocks.
- locker: A mechanism that locks the differential, forcing both wheels on an axle to rotate at the same speed for increased traction.
M
- mud-terrain tyres: Tyres designed with aggressive tread patterns for maximum grip in muddy and off-road conditions.
N
- nitrogen shocks: Shock absorbers filled with nitrogen gas to reduce fading and improve performance under extreme conditions.
O
- off-camber: A trail or road that tilts to one side, presenting a challenge for maintaining traction and vehicle stability.
P
- pinion gear: A small gear in the differential that drives the larger ring gear.
- pumpkin: Slang for the differential housing, typically referring to its rounded shape.
Q
- quarter-elliptical suspension: A suspension system using quarter-elliptical springs, providing a balance between ride quality and load-carrying capacity.
R
- redline: The maximum engine speed indicated on the tachometer, beyond which engine damage can occur.
- RTI: Ramp Travel Index, a measure of a vehicle’s suspension flexibility and articulation.
S
- serpentine belt: A single, continuous belt that drives multiple engine accessories such as the alternator, water pump, and power steering pump.
- shiny-side down: A term used to describe a vehicle that has rolled over.
- snatch block: A pulley device used to increase the pulling power of a winch, often used in vehicle recovery.
- synthetic oil: Man-made lubricants designed to provide superior lubrication and heat resistance compared to conventional mineral oils.
T
- T-case: Transfer case, a gearbox that transfers power from the transmission to the front and rear axles, allowing for four-wheel drive.
- tread lightly: A principle encouraging responsible and minimal-impact off-road driving to preserve the environment.
- trail boss: The leader of a trail ride, responsible for navigating and ensuring the group’s safety.
U
- U-joint: Universal joint, a flexible coupling in the drivetrain that allows for changes in alignment and angle.
- understeer: A condition where the front tyres lose grip before the rear tyres, causing the vehicle to steer less than desired.
V
- vacuum advance: A device that adjusts the ignition timing based on engine vacuum, improving efficiency and performance.
- VIN: Vehicle Identification Number, a unique code that identifies an individual vehicle.
W
- wheelbase: The distance between the centres of the front and rear wheels, influencing the vehicle’s stability and handling.
- winch: A mechanical device used to pull or lift heavy loads, commonly used in vehicle recovery operations.
X
- X-brace: A structural component designed to increase the rigidity and strength of a vehicle’s chassis.
Y
- yaw: The rotation or turning of a vehicle around its vertical axis, important for vehicle handling and stability.
Z
- zerk fitting: A grease fitting used to lubricate suspension and chassis components, ensuring smooth operation.
