Camshaft: A shaft having a number of cams at appropriate angular positions for operating the valves at timings relative to the piston movement and in…

Bypass filter: A filter through which only a part of the total engine lubricating oil flows.

Butterfly Valve: A valve consisting of a flat circular pivoted along a diameter; used as throttle valve in carburettor engines.

Breathing: Ability of an engine to take in air-fuel mixture and to discharge exhaust gases efficiency. Many of the modern car engines are provided with…

Breakerless ignition: Ignition system where the mechanical switching device, such as contact breaker is replaced by an electronic switching device through the use of transistors.

Breaker points (C.B. points): A set of contact points for opening and closing the primary circuit of an electrical ignition system.

Brake Points (B.P.): It is the actual power delivered at the crankshaft.

Boxer engine: Horizontally opposed engine, where opposing pistons are attached to different crankpins.

Blow-by: Blow-by is said to occur when air-fuel mixture or the burnt gases from the combustion chamber leak past the piston rings to the sump.…

Bio-diesel: Fuel oil obtained from bio-sources like soya bean, jetrophe, etc. Having properties similar to diesel, it can be used in existing diesel engines without…

Bendix drive: Inertia type of starter drive used in smaller vehicles.

Battery reserve capacity: The time in minutes of which the battery can supply 25 amp and 25°C, without the cell voltage falling below 1.75.

Battery capacity: Amount of current the battery can deliver. It depends upon the number and area of plates, quality of the electrolyte and the temperature.

Back pressure: It is a form of resistance to the free flow of exhaust from the cylinder head. It may be due to badly designed…

Backfire: An engine is said to backfire when fresh unburnt charge of fuel burns in the exhaust system on account of leakage from the exhaust…