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4 stroke si combustion tempature3/12/2024 ![]() ![]() If the fuel/air ratio is reduced, then lower power can be achieved with the throttle closer to fully open, and the efficiency during normal driving (below the maximum torque capability of the engine) can be higher. However, the extra work done in pumping air through the throttle reduces efficiency. Ordinarily, the power is cut by partially closing a throttle. An engine in a typical vehicle is sized for providing the power desired for acceleration, but must operate well below that point in normal steady-speed operation. High air–fuel ratios can also be used to reduce losses caused by other engine power management systems such as throttling losses.Ī lean burn mode is a way to reduce throttling losses. The excess of air in a lean-burn engine emits far less hydrocarbons. The air / fuel ratio needed to stoichiometrically combust gasoline, by contrast, is 14.64:1. In lean-burn engines the air–fuel ratio may be as lean as 65:1 (by mass). Lean-burn refers to the burning of fuel with an excess of air in an internal combustion engine.
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