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Engine four-step design in the era of the millennium has become the backbone of many machine racing, both road-race, drag race, motocross, racing through the streets. But the concept of science of the volumetric efficiency, thermal efficiency, and mechanical efficiency and how they correlate to the performance of an engine and engine parts are still not yet known.
It's common for us to know that the pistons move up and down, and the valve is opened - close to form a four-stroke cycle which is very beautiful. Basic knowledge about the machine is very important and will uncover the mysteries to explore horsepower parts and choosing the right machine to be replaced.
POWER SOURCE Machine is the engine that transforms fuel into energy rotating motion, which is often measured in horsepower (HP). Dikabutkan fuel mixture with air flowing through the carburetor into the cylinder. This mixture is blown up inside the cylinder, creating enough heat to generate pressure. Piston in the cylinder was thrown down by a kick back from the explosion in the combustion chamber to be able to play as crutches.
Now the science begins. Fuel is a source of chemical energy. How much gasoline can be burned effectively in the engine is closely connected with the output energy. Wait a minute, do not be home trying to install a larger main jet in karburatormu now to raise power. If a mixture of air with the fuel is too wet, the machine will not operate normally, this will make the engine produce less power.
The best way to think is: The greater the capacity of the heart in a machine to suck air and fuel into the cylinder stomach, then, the machine with large capacity will result in greater power in a way more easily.
Volumetric Efficiency Imagine that you have a 100 cc single cylinder engine. In the suction step, the piston moves downward into the cylinder's bottom, and fill the cylinder volume. How much of a mixture of air / fuel that can meet the volume inhaled and the cylinder will be used to create energy.
Now imagine that in a race engine we are limited by the constraints small carburetor venture. With a 100 cc engine configuration, it is not necessarily the piston is already moving too interesting mixture into the cylinder 100cc, air is not sucked in the atmosphere. But the intake manifold vacuum.
Volumetric efficiency, is used to describe the amount bahan-bakar/udara in the cylinder in the series of atmospheric air. If a cylinder filled with air / fuel according to atmospheric pressure, the engine can be said to have 100% efficiency. The higher the percentage efficiency of the engine, the greater the ability of automated machines to produce energy.
Basically, volumetric efficiency is influenced by a venturi carburetor, intake manifold, header design and size, geometry and calculations and specifications ported duration and lobe Lifter noken aces.
THERMAL EFFICIENCY Intensifying the air / fuel into the cylinder mkedalam means more explosions that are used to generate power. Unfortunately, not all energy can be used to play as crutches. Usually 30% of them would be a futile effort.
Compression ratio, ignition timing, location of spark plugs, and combustion chamber design will all affect the Thermal Efficiency. Street machines are usually equipped with only a low level of compression ratio, has a thermal efficiency of about 0:26. Racing engine thermal efficiency may be increased up to 0:34. Because these figures are relatively small, it seems very little difference between the daily racing engines. However, if calculated with the method of calculus of the racing engine producing 30% greater power because of its greater thermal efficiency.
Finding a small development on the thermal efficiency can yield significant improvements for the horsepower produced. Proper mix compression ratio, ported and fuel used will be able to improve thermal efficiency.
MECHANICAL EFFICIENCY Volumetric efficiency indicates how much fuel could be used to produce horsepower, while the power is still reduced due to the moving parts inside the machine. Against friction between the surface would reduce the power.
Depending on how much fuel is capable of inhaled, and how many could be turned into effective power. However, engine performance is reduced because the piano gesekat valve, bearing, piston with the liner surface rub. The higher the RPM the more energy must be produced by the machine to do it. Spinning faster and faster machines, the mechanical efficiency fell.
source:http://ratmotorsport.wordpress