What Does Power per Liter Mean?
1 Answers
Power per liter is an overall evaluation of cylinder working volume utilization from the perspective of engine effective power. The higher the power per liter value, the greater the engine's intensification degree, and the smaller the engine size required to produce a certain effective power. Specific measures to improve power per liter are as follows: Increasing air charge: This is the primary condition for increasing heat in four-stroke engines, because fuel combustion requires air. Compared to fuel, air is more difficult to fill into the cylinder, so it is necessary to improve gas exchange conditions, reduce intake resistance, and increase the cross-sectional area of the valve passage. Some engines adopt a 4-valve configuration. When intake valve structural arrangement is difficult, priority should be given to meeting intake valve requirements, with the number of intake valves equal to or greater than exhaust valves. Increasing engine speed: Increasing speed to boost air charge per unit time. Passenger car engines are generally high-speed engines, with speeds exceeding 5,000 rpm. Improving mixture quality and combustion process. Adopting electronically controlled fuel injection systems ensures optimal mixture quality under all operating conditions. The mixing location of air and fuel shifts from the throttle to the injector, where fuel directly mixes with incoming air, fundamentally improving mixture uniformity. Improving mechanical efficiency: Enhancing engine mechanical efficiency increases effective work output. Reducing mechanical losses mainly involves minimizing friction between components, which relates to part machining precision, surface quality, lubrication quality, temperature control, and reducing accessories.
