Gasoline engine because fuel viscosity is small, fast evaporation, along with the air outside of the cylinder can take shape a uniform mixture, and so the mixture sucked towards the cylinder, fuel injection system or fuel injected towards the cylinder, the gas expansion work done. In the first place of 1886 the 1st car, the gasoline engine in a car, especially with the extensive by using small cars, has never changed.
The problem with gasoline is lower versus the thermal efficiency of diesel engines, fuel consumption more the engine ignition system complexity, reliability and training comprehension maintenance is not as diesel engines. [1] gasoline engine works: an operational cycle includes four piston stroke (so-called piston stroke means the piston with the TDC to BDC the gap involving the process): the intake stroke, compression stroke, expansion stroke ( power stroke) additionally, the exhaust stroke.
 Gasoline engine compression stroke

To sucked in to the cylinder of an combustible mixture can rapidly burn that allows you to enjoy a greater pressure, therefore the larger issue of the engine power, really needs to be burning combustible mixture before compression, to get rid of the amount, density, increased temperature, requiring compression. In this particular process, the intake and exhaust valve fully closed, push the piston fire up only using the next thing to move a getaway point that compression stroke. At the moment a combination pressure raise to 0.6-1.2MPa, temperature upto 600-700K.

Available in this trip we have a imperative concept, that can be, gasoline generator the compression ratio. The so-called compression ratio, the gas cylinder before compression could be the maximum volume and minimum volume compression ratio. Compression ratio can often be greater contained in the compressed mixture of no more the more pressure and temperature, the faster the burn, thus the greater the power the engine issue, the greater the economy. General car from the compression ratio within the 8-10, luckily the actual variety of Polo reached an excessive 10.5 compression ratio, that makes it relatively good performance of torque. Nonetheless compression ratio is simply too large, not only will not further improve the combustion, but there is violence and surface ignition fuel combustion, which aren't normal phenomenon (the impact of fuel quality is occupies a important position, which we can explain in more detail later).
Deflagration is gas pressure and temperature from your combustion chamber as opposed to the distance from center using the end ignited combustible mixture ignition as a result of an abnormal combustion. Deflagration with a big rate where the flame to spread, even the scenario of expansion of the gas too late, sharp embrace temperature and pressure to create a pressure wave, the cost of sound to flex forward. Once this pressure wave hit the combustion chamber wall is known as a sharp knock located on the issue of sound. In the mean time, may cause engine overheating, turn off, fuel consumption increases and then a group of adverse consequences. Severe storms may well cause burning or burned valves, broken bearings, spark plug insulators along with other parts damaged by breakdown phenomena.
Gasoline engine fuel besides violence, high compression ratio engines might possibly face one other issue: the exterior ignition. Simply because the tank towards the hot surface and hot (for example , exhaust valve head, spark plug electrodes, carbon deposition at) ignite many people expressed by another abnormal combustion (sometimes referred to as hot since ignition or fuel). Surface ignition occurs, also is making use of a strong Knocking sound (more boring), the resulting high-pressure causes the engine load increases, cultivator shortened life-span.