tools in English is called carburetor which means pengkabutan. Which is a part or component that serves to change the motor fuel from liquid or gaseous form or liquid into spray / smog. Where this carburetor, should be able to mix between fuel and air with a specific ratio of 1: 14.7 which means it is mixed with the scale, 1gram fuel with 14.7 grams of oxygen ...Why emerging 14.7 figure ... .???? Yup, the rate of 14.7 in the can from the stoichiometric combustion of fuel gas with oxygen.
C7H16 + 14.7 O2 -> CO2 + 8 H2O 7.
That is a simplification of the chemical process between gasoline combustion with oxygen ...
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* Ratio of output power maksimum.Pada seseungguhnya engine, if we replace the air and fuel ratios around 13: 1 or it can be said rich mixture, then will we be able ratio of maximum power output.
* Ratio of fuel efficiency maksimum.Sedangkan if we change the ratio of fuel in the opposite direction, ie 16: 1 or poor. Then we will find the ratio of fuel efficiency maksimum.Dari 2 things above, we can conclude, if we want to fish a larger power, then we will play in the ratio of rich ... But if we want efficiency fuel efficient reply, then we will poor play in the mix. Very hard to get a mixture of poor but powerful ... Definitely one to be sacrificed ...
Basic Principles of Carburetor
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At the suction step, where the piston moves from TDC to the TMB resulted in the air sucked through the air filter, then through the carburetor and into the cylinder. Using negative pressure or vacuum from an enlarged chamber when the piston drops down, then when the air flow, the carburetor to fuel atom-ization.
In a carburetor, there is an area that is experiencing a narrowing of the channel or we call the "venturi", when air passes through this venturi tunnel, the air velocity in the venturi area will increase, but otherwise the air pressure will decrease ...
Based on the Law Bernaulli once I learned who, where ...
P / € Vkuadrat + / 2 + g.Z = constant
P = pressure (kPa) V = velocity (m / s) Z = height (m)
So it is clear that the velocity is inversely proportional to the pressure in a pipe flow.
Well, with the venturi principle had led to the venturi area the pressure decreased, even under atmospheric pressure environment .. Well this pressure difference that causes the energy difference between the area with an area venturi carburetor fuel bowl ...
That the energy will flow from a high point to low point ...
The pressure in the gasoline carburetor bowl is normal atmospheric pressure, while the pressure in the venturi area under atmospheric pressure .. So moved was the gasoline from the gasoline in the carburetor bowl to the venturi area who have a lower pressure ... So that gasoline will go up through the channels and the main jet will ter-atom-ization into mist or spray.
Types of Carburetors
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For a variable venturi type carburetor, the diameter of the venturi is adjusted by the throttle valve (skepticism).
Variable venturi type is divided into two types of construction of the venturi.
1.Tipe PV or piston valve (manual skepticism).
2.Tipe CV or constant velocity (vacuum).
Carburetor Type PV
In some variable venturi type carburetor, the venturi opening area of the ups and downs to change the valve or piston type carburetor skep.Dalam this PV, skepticism or piston valve also serves as a throttle valve to regulate the amount of flow udara.Ketika clip-operated throttle and throttle valve (skepticism) rose to the top, from the opening of the venturi area increases so that the discharge air naik.Tekanan resultant negative by the speed of the airflow at the venturi sucking fuel through the main nozzle. When the throttle clip (gas) is returned, then skepticism would go down by the pressure of spring skepticism.
CV Carburetor Type
Apart from that form venturi piston, the amount of air flow is controlled by a butterfly plate (circular plate as a choke carburetor). When we pulled the gas, then the butterfly plate will open, leading to increased air flow and skepticism (throttle valve) will be lifted due to the negative pressure in the venturi area ... At the same time the fuel out through the main nozzle.Pada this type, the air velocity in the venturi is maintained so that the approaching a constant.
In the two carburetors has its own effectiveness. PV type carburetor has a good acceleration but the composition of gas mixtures are not ideal while the CV carburetor has an ideal blend composition but less good for acceleration.
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