How much fuel does a car consume in one hour at idle speed?
1 Answers
When the engine is running at idle speed, the fuel consumption is related to the engine's own displacement. Taking a 1.6L displacement engine as an example, at an idle speed of 800 rpm and without additional loads such as air conditioning or radio, if it runs for one hour, the fuel consumption is approximately 1011.2 milliliters, which means slightly more than 1 liter. The following are relevant details: 1. Vf represents the fuel consumption per hour, measured in milliliters per hour; V refers to the engine displacement, measured in liters (L); n is the engine speed per minute (rpm). According to the above formula, when a car has a displacement of 2.0L and a speed of 700 rpm, the fuel consumption at idle speed for one hour is calculated as 0.79*2.0*700=1106 milliliters. 2. If the air conditioning is turned on while idling, another formula is needed to calculate the fuel consumption: Vf=0.02636*P*V*n (ml/h), which also gives the result in milliliters of fuel consumed per hour. Compared to the previous formula, this one includes an additional parameter P, which represents the manifold pressure at idle speed. There are two ways to obtain this data: using professional instruments to measure it or utilizing the vehicle's onboard computer to read the data transmitted by sensors.
