Diesel engine: An engine that burns diesel fuel instead of gasoline, The diesel oil is injected directly to the combustion chamber, where it's ignited by the heat caused by intense compression rather than by a spark from the sparkplug.
Differential: A component of gears that is situated in RWD cars bet the rear wheels that translate the power of rotating driveshaft to drive the rear wheels. while in FWD cars the differential is located in the transaxle , usually directly below the transmission. it also allows each of the opposing wheels to turn at a different speed when cornering.
Dipstick: A stick that is dipped in a reservoir to check the level of the fluids based on the markings on the stick. most common dipsticks are used to check oils, transmission fluids, powersteering fluid.
Displacement: Usually refers to the combined volume of the Piston chambers that is the maximum volume of fuel and air that an engine cn hold before compression takeplace.
Double Over Head Cam: An engine that uses two camshafts mounted mounted on the head to control the intake and exhaust valves respectively. this eliminates the need for pushrods to open and close valves.
Downshifting: A technique referring to manually shifting to a lower gear to acccelerate or to give more power. this technique is also used in braking to assist the brakes in slowing down the vehicle.
Drive train: A term referring to all components along a path of power from engine to drive the wheels. it consists of clutch, transmission, driveshafts, differential, transaxle or rear axle.
Drive Belt: the belt that transfers the rotation of an engine via the cranckshaft pulley to drive the various devices such as altrenator for electricity, water pump for the cooling system, air conditioning, compressor for your air conditioning, or power steering pump for your steering system.
DriveShaft: a spining metal shaft that transmits power from the ftransmission to the differential , the axle, and the drive wheels.
Dual carbs: two carburetors on same engine allowing more fuel and air mixture to enter to the engine.
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