Engine capacity: This is the total piston displacement of all the engine cylinders.

Electronic Ignition: A system in which the timing and firing of the spark plugs is controlled by an electronic control unit, usually called a module.…

EGR system: Exhaust Gas Re-circulation is one of the methods of diluting the intake charge of the engine with exhaust gas, which reduces NOx emission.

Electronic Control Unit (ECU) or Electronic Control Module (ECM: Electronic Control Unit (ECU) also called Electronic Control Module (ECM) is the central controlling unit of…

Dynamometer: An equipment used to measure engine power.

Dynamo: A device driven by the engine and producing direct current (d.c.)

Dynamic timing meter: A General Motors diesel engine tool used to measure timing while the engine is running by using a quartz sensor in the…

Dwell: Dwell is the time expressed in terms of the degrees of distributor cam rotation for which the contact breaker points remain closed. It is…

Double Overhead Camshaft ( DOHC): The engine has two camshafts mounted in one cylinder head. One camshaft operates the intake valves, while the other operates…

Doping: The process of adding a very small quantity of impurity element to a semi-conductor material. Depending upon the type of impurity added, the semi-conductor…

D-Jetronic: Fuel injection system by Bosch, where 'D' stands for 'druck', which means 'pressure' in German language. The system is controlled by manifold pressure, indicating…

Distributorless Ignition System (DIS): An electronic ignition system which does not have a conventional rotating distributor. It employs multi-spark ignition coils or one ignition coil…

Distributor: A mechanically driven device on an engine which is responsible for electrically firing the spark plugs at a pre-determined point of the piston stroke…

Displacement: The volume of the cylinder between the top dead centre and the bottom dead centre positions of the piston.

Direct injection: A fuel injection system for diesel engines, wherein the fuel is injected directly into the combustion chamber, onto the top of the piston.