Second, excessive carbon fire engine Third, the air-fuel ratio of fire engines is not correct
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If the excessive carbon deposition in the combustion chamber of the engine will increase the compression ratio (high pressure is generated), high-temperature hot spots will be generated on the carbon deposition surface and the engine will knock.
Too light a mixture ratio of fuel to air will increase the combustion temperature, and an increase in the combustion temperature will cause an increase in the temperature of the environmental protection sweeper engine, which is, of course, prone to knocking. IV. Fuel octane is too low
The octane number is an indicator of the anti-knocking of the fuel. The higher the octane number, the stronger the anti-knocking resistance. The high compression ratio of the Sanitation Sweeper engine, the combustion chamber pressure is high, if the use of low anti-knocking fuel, knocking is likely to occur.
Causes of knocking failures in engines of fire engines
First, the fire engine ignition angle is too early In order to make the piston after the compression of the top dead center, once the power stroke can immediately get power, usually before the piston reaches the top dead center ignition (because from ignition to complete combustion takes some time) . However, too early ignition will cause most of the oil and gas to burn when the piston is still in the compression stroke. At this time, the unburned oil and gas will withstand extreme pressure auto-ignition and cause knocking.