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The spring carries the weight, the damper controls how the spring moves, and the anti-roll bar connects the two sides. Three separate jobs, constantly confused — particularly the damper, which almost
It lets the driven wheels turn at different speeds while both still receive power — which is necessary because when a car turns, the outer wheel travels further than the inner one. The problem it
Because emissions regulation rewards it and turbocharging made it possible. The trend is called downsizing, and it changed the market substantially over the past fifteen years. Why smaller engines
A crumple zone is a section of a vehicle designed to deform progressively in a collision, absorbing energy and extending the time over which the occupants decelerate. The physics, which is the whole
For two reasons, and the larger one is not the battery — it is heating the cabin, which an electric car must do in a way a petrol car does not. Cabin heating is the dominant factor. A combustion
They are three related systems built on the same hardware, addressing three different loss-of-control situations. Understanding what each does explains why the car sometimes seems to interfere. ABS —
A constant velocity joint transmits drive from the gearbox to the wheels while allowing the wheel to steer and move up and down with the suspension — all at a constant rotational speed regardless of
Torque is rotational force. Power is the rate at which work is done. They measure different things, and the relationship between them is fixed and simple. Torque is a twisting force, measured in
Euro NCAP is an independent crash testing programme rating vehicle safety from one to five stars. The rating is genuinely useful and is frequently misread, because of one feature that catches almost
A Vehicle Identification Number is a 17-character code uniquely identifying one specific vehicle. It is standardised internationally, and it is the most reliable identifier a car has — far more so
They do opposite jobs. The starter motor consumes electricity to turn the engine over. The alternator generates electricity once it is running. The starter motor. A powerful electric motor that
Both are internal combustion engines, and the fundamental difference is how the fuel is ignited — which determines almost everything else about how they behave. Petrol — spark ignition. Air and fuel
A vehicle history check — HPI check, or equivalent from several providers — searches industry and government databases for facts about a specific vehicle that a seller may not disclose. It is one of
Because it is usually far larger than fuel, insurance, tax and servicing combined — and it is invisible, since you never write a cheque for it. What depreciation is. The fall in a vehicle's value
Both describe a car not turning as much as the steering input asks, but the end that loses grip differs — and so does what the car does next. Understeer is when the front tyres lose grip. You turn
Slipping — the period when the clutch plate and flywheel are rotating at different speeds while in contact. That is when friction material is being ground away, and every technique that extends it
They all match engine speed to road speed. The differences are in how they change ratio, and each has a distinct character. Manual. You select gears with a lever and disengage drive with a clutch
AdBlue is a solution of 32.5% urea in deionised water, used to reduce nitrogen oxide emissions from modern diesel engines. It is a consumable, not a fuel additive, and it goes in its own separate
Because they contain small quantities of extremely valuable precious metals, and they are unusually easy to remove. What is inside. A catalytic converter contains a ceramic honeycomb coated with
They are entirely different things, and treating one as covering the other is a common and expensive mistake. An MOT is a legal roadworthiness test, required annually in the UK for most vehicles over
It recovers kinetic energy that conventional braking would waste as heat, converting it back into electricity to recharge the battery. Conventional friction braking works by converting the vehicle's
A turbocharger forces more air into the engine than it could draw in by itself, allowing more fuel to be burned and more power produced from a given engine size. How it works. Exhaust gases leaving
Mineral oil is refined directly from crude petroleum. Synthetic oil is engineered — either heavily processed from petroleum stock or built from chemically synthesised base molecules — so that the
The colour is a reliable guide to what is being burnt that should not be, and it narrows the diagnosis considerably. Thin white vapour that disappears quickly is normal, especially on a cold morning.