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EXHAUST EMISSION CONTROL
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The pollutants emitted from the exhaust
system are harmful to environment. If
combustion is absolutely complete, there
would not be any atmospheric pollution from
the exhaust system. Water and carbon dioxide
are the products of perfect and complete
combustion. However, complete combustion
is difficult to achieve in internal combustion
engines.
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There are three major pollutants in the exhaust
emission. They are:-
1. Unburnt hydrocarbons (HC)
2. Carbon monoxide (CO)
3. Nitrogen oxides (NO )
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WHY DOES THE GASOLINE FAIL TO BURN
COMPLETELY?
There are several reasons for incomplete
combustion. Some of them are:-
1. Weak spark
2. Improper air-fuel mixture ratio
3. Adulterated petrol
4. Wrong ignition timing
5. Low compression
6. Excessive valve over lap
7. Improper idle speed
8. Incorrect exhaust system
POLLUTION CONTROL
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With the enforcement of various motor vehicle
rules, standards have been set for allowable
percentage of CO emitted from the exhaust
gases as shown below:
By mass
Below 0.83 gm / km
By volume
Below 3.0 %
TVS APACHE RTR 200
SERVICE MANUAL
FUEL, LUBRICATION AND
EXHAUST SYSTEM
4-14