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Auto tech b2 Cheat Sheet (DRAFT) by

Automotive technology b2

This is a draft cheat sheet. It is a work in progress and is not finished yet.

OPERATION OF DIESEL ENGINE

fundam­entals
flash point temper­ature at which diesel fuel will briefly ignite when a flame is near it.

ignition point lowest temper­ature at which it will sponta­neously ignite without a spark.

Comp­ression ratio = (A+B) / A

Diesel oil has a lower ignition point

Diesel engine have a higher compre­ssion ratio compared to petrol engine is the self‐i­gnition system that uses heat created compre­ssion to ignite fuel.
  

Fuel System

Used to pressurize fuel and inject it into the combustion chamber.

Out line

Consists of fuel tank, fuel feed pump to supply fuel to the injection pump, a fuel filter to remove contam­inants, an injection pump to pressurize the fuel and to deliver an approp­riate quantity of it under pressure at optimal timing, injection nozzle to inject high pressure fuel into the combustion chamber and components connected.

water seporator

Water separator separates water that is in the fuel due to the difference in the specific gravity from diesel oil.

CONSTR­UCTION AND FUNCTION (copy)

Fuel filter Spiral V‐shaped paper with pore size of 8 μm or less is commonly used for cartridge in modern systems. Sedimenter is usually fitted under filter for water collection to avoid corrosion fuel injection compon­ents.

CONSTR­UCTION AND FUNCTION (copy)

Feed pump used to feed fuel from the tank to the injection pump. Controls fuel pressure to prevent any unusual status. Also designed to bleed air

Injection pump

^Injection pump applies pressure to fuel to be injected in the combustion chamber or uniformly injects the approp­riate amount of fuel at optimal time (the function of timer) according to the engine revolu­tion.