Sentences with phrase «unburned air»
By keeping an intake valve open during part of the compression stroke, some of the volume of unburned air / fuel mixture in the cylinder moves back inside the intake manifold and lowers the volume being compressed, or «pumped.»
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Alkane hydrocarbons (propane, isobutane, and n - butane) from liquefied petroleum gas (LPG) are present in major quantities throughout Mexico City air because of leakage of the unburned gas from numerous urban sources.
It is a simple vain air pump that puts fresh air into the exhaust manifold to help burn off any unburned fuel and reduce emissions.
Retarding the spark or cutting the throttle dumps unburned hydrocarbons into the exhaust; too much of it will overheat the catalytic converter, a filter attached to the exhaust system that reduces air pollution.
In a conventional vehicle, unburned gas fumes can escape through the engine's air intake once the engine is shut off.
Many of these small internal combustion engines used for yardwork can release as much as 30 % of the fuel / oil mixture as unburned pollutants into the atmosphere due to incomplete combustion, which not only wastes fuel and money, but also contributes to air pollution.