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Diesel Engine Principles For Beginners

Diesel engine principles are pretty allows compression to take place, the
straight forward for the experienced HEAT OF COMPRESSION is reached when the
mechanic but what about regular everyday piston reaches the top of the cylinder,
people who have never taken the time to the diesel fuel is then injected into the
find out more about a diesel engine and cylinder at the precise time.
how it works? 3} POWER STROKE:
I am going to explain in layman's terms After injection takes place an explosion
the basic principles of a diesel engine. occurs in the cylinder because of the
WHAT'S THE DIFFERENCE BETWEEN A GASOLINE combination of heat and atomized diesel
ENGINE AND A DIESEL ENGINE?...a quick fuel. This causes the piston to be forced
overview. downward which produces torque and the
The first thing you should know is a horsepower required from a typical diesel
gasoline engine and a diesel engine are engine.
totally different. A gasoline engine is 4} EXHAUST STROKE:
constructed much lighter than the heavier After the power stroke the piston moves
built diesel engine and runs on an air upward once again while the exhaust
fuel mixture combined with a high energy valves open allowing the previously
spark that is timed to ignite the air ignited gases to escape to the atmosphere
fuel mixture inside each engine cylinder out the exhaust system.
at the precise time creating power and As mentioned before each cylinder goes
torque [turning force] which drives your through this exact sequence over and over
vehicle. in a set firing order. For instance, a 6
A diesel engine uses high compression cylinder diesel engine has a firing order
[intake air that is compressed / 1- 5- 3- 6- 2- 4 This is the order that
squished] into a very small space inside each cylinder goes by, following the 4
each cylinder causing extreme heat! This strokes mentioned above. This sequence
is called 'Heat Of Compression' which has been engineered to allow the diesel
ignites a very fine high pressure mist of engine to run smoothly with no imbalance.
diesel fuel that is injected into the DIESEL ENGINE TRIVIA: Today's high
cylinder at the exact time. performance diesel engines.
So you now know that a gasoline engine Fuel passes through the injector at
needs a high energy spark to run while a speeds of nearly 1500 miles per hour - as
diesel uses 'Heat Of Compression' fast as a jet plane at top speed.
THE FOUR STROKE PRINCIPLE Fuel is injected into the combustion
Every engine today runs on FOUR STROKES chamber in less than 1.5 milliseconds,
or FOUR CYCLES- both these terms mean the the same time it takes for a camera flash
same. Here is how the four stroke diesel to go off.
engine operates. The minimum amount of fuel injected into
The four strokes are: a diesel engine is one cubic millimetre -
INTAKE-COMPRESSION-POWER-EXHAUST. The about the same volume as the head of a
pistons, valves and injectors work pin.
together in each cylinder in a set Volkswagen has developed a 1 litre diesel
sequence over and over. powered car that got 100 kilometres out
1} INTAKE STROKE: of .89 litres of fuel {60 miles on
Intake valves in the cylinder head open approxiamately 3/4 of a quart of fuel!}
allowing pressurized air to enter each There is much to learn about diesel
cylinder while the piston is travelling engines and a ton of information online.
downward.{the pressurized air supply is If you have ever considered buying a
made possible by the TURBOCHARGER which vehicle with a diesel engine you have my
pushes air into the intake system giving blessing! The extra cost will be to your
the diesel engine a boost of air to keep benefit, so I recommend finding out more
up with instantaneous injection of fuel} about diesel engines before you decide
2} COMPRESSION STROKE: which one to choose..
When the piston starts to make it's way I hope you have found this information on
back upward the valves close which traps diesel engines helpful!
the intake air in the cylinder which




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