Read about Engine
Combustion chambers in detail and Factors affecting the performance of chambers
here- Partsavatar.ca Vehicle Parts!
Have you ever thought
just how the fuel is burnt inside the car? Many of us will make a rough guess
that it’s the job of an engine. It is. But who is performing this job inside
the engine exactly?
We need fuel to run our
cars. To burn that fuel and to produce energy some space is required. That’s
where the concept of combustion chamber dives in.
Combustion
chamber is an enclosed part of internal combustion engine
in which air- fuel mixture is burnt. In short, combustion chamber is that area
where air fuel mixture is ignited.
It is generally formed on the one side by the
shape cast into the cylinder head and on the other side by the top of the car
engine's piston . When the piston is at the top dead
center and the chamber is at its smallest dimension then this is the most
vulnerable and unstable condition for air fuel mixture and then it is ready for
ignition process. The combustion process increases the internal energy of the
gas, thus increasing the temperature and volume of that gas. In the confined
place, the volume is controlled and the pressure is produced. This pressure
helps in moving piston on a crankshaft through automotive engine’s crankshaft pulley.
Combustion chambers
work as the lungs for the engine. The better the combustion chamber design is
the better the engine breathes. Combustion chamber design plays a pivotal role
in the performance of Car’s Engine.
Car’s engine performance depends upon Shape of the top of the piston,
shape of the chamber, location of valves
and spark plugs and overall airflow through exhaust and intakes.
Now let’s have a look
at widely used combustion chambers in modern cars.
Internal
Combustion Engines
Internal
combustion engine is a heat engine in which the
combustion of air-fuel mixture takes place in an enclosed space which then
produces energy and pressure to move piston, rotors and turbine blades. They
basically use air as the oxidizing agent.
Different types of
combustion chambers are found in the internal combustion engines.
Cars and Motorized
boats work on the Piston engine mechanism. In the combustion chamber, the
energy created by burning air fuel mixture helps in sliding the piston tightly
within the cylinder. In these engines, the location of combustion chambers may
vary. The chamber may be located in the cylinder head or on the top of piston. For
example a V6 engine with cylinders and pistons is commonly used in front wheel
drive cars.
As compared to cars the
jets and other gas turbines use combustors where the air is pulled in and
compressed through the compressor.
Factors
affecting the working of Combustion chambers
We can readily detect
the problems with spark plugs and engine misfire of car if we know what exactly is happening inside the
combustion chamber.
Internal combustion
engine is advancing day by day towards the route of perfection. The revolution
in the engine world was made by moving fuel injector port into the cylinder and
making combustion process more precise. Automakers are aspired to make the
engines with compression ratio 12:1 with low emission elements like pump gas
and cast pistons.
Spark
Plugs
Spark plug is a vital
component of car’s ignition system. It delivers the electric current produced
by car’s
ignition system parts to the combustion chamber to ignite air
fuel mixture by electric spark. It also acts as a heat exchanger as it pulls
unwanted thermal energy from the combustion chamber and transfers heat to
engine’s cooling system.
They play a vital role
in igniting the fuel. In modern cars, the area where the spark is created is
much smaller while the plug gaps are same as that of old engines. But today’s
spark plugs have increased its complexity.
Ford 5.4 Triton V8
users often complain about the spark plugs as they are long and narrow and at
the same time very difficult to remove. They are placed near the exhaust and
intake valves. So, if the spark plugs wear out by time, ford users need to pay
for extra labor cost to remove the complex parts before getting to the spark
plugs. In the spark induced internal combustion engines, just forget to drive
if the spark plugs are not working.
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EGR
Systems
Exhaust gas recirculation or EGR of car is an effective mechanism to
control NOx emissions from diesel engines. The EGR reduces the level of NOx
gases by lowering the oxygen concentration in the combustion chambers and by
heat absorption. EGRs are popular in Gasoline engines to increase the engine
efficiency and reduce the pumping work.
EGR systems put a small
amount of inert gas into the combustion chamber to control the temperatures.
They reduce the NOx emission by lowering the combustion temperature as the
exhaust gases do not get burnt.
The temperature in the
combustion chamber due to various reactions and mixing may rise up to 2500°F. In
high temperature, the oxygen and nitrogen start combining to form harmful gases
like NOx and CO.
Advanced vehicles with
variable valve timing on both exhaust and intake cam shafts can adjust the
timing so that small amount of exhaust gas is sucked into the chamber during
intake stroke.
A properly working EGR
system is very important to prevent the formation of harmful oxides in the
chamber due to increased temperature. It affects both exhaust system parts as
well as the performance of the engine.
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EGR system components and Auto Exhaust system
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auto parts.
Catalytic
Converter
Catalytic converter is
one of the most expensive parts of the car and heavily prone to theft due to
its design. It contains catalyst that fastens the conversion of unburned
hydrocarbons, nitric oxides and carbon monoxides into less harmful gases like carbon
dioxide, nitrogen and steam/water. The reactions inside the combustion chambers
directly affect the working of a catalytic converter.
Anything that gets
through the combustion chamber and reaches the face of the converter can reduce
its efficiency.
If the emission system
sensors fail to detect the formation of gases and substances inside the
chamber, you are just inviting a huge replacement bill.
Install sensors and
keep record of the emissions of the car exhaust
tailpipe. Make sure there is no leak in the engine that is
causing the leakage of coolant or other liquid into the chamber as the liquid
will automatically flow from chamber to the converter and hence the ultimate destruction
of the catalytic converter will take place. Mind you, replacement of a normal
Catalytic converter may start from $2000.
For good engine
performance and combustion chambers, better keep the catalytic converter in
good condition. Buy top quality cars' direct fit catalyticconverter parts at cheap prices from parts avatar
Canada.
Bottom-line
To achieve a robust
combustion event out of a combustion chamber, pay attention to the upper
mentioned factors. Exhaust gases especially the harmful ones are not good for
engine’s health. With the technologies, ensure the correct amount of air-fuel
mixture is being burnt in the chamber and optimal engine performance is being achieved.
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