What is the normal value of engine intake flow?
2 Answers
Most vehicles have an intake flow rate between 1000-1500g/s. Intake flow in different gears: This cannot be precisely determined as intake volume varies with engine displacement. The specific value depends on which gear is engaged, as different gears have different intake volumes. To determine normal intake flow, calculate based on your vehicle's displacement. Generally, an intake flow of 1000-1500g/s is considered normal for most vehicles. Intake volume: Intake volume refers to the flow rate of fresh air entering the car engine, which provides the necessary oxygen for proper engine operation. Accurate estimation of cylinder intake volume under transient conditions is one of the effective measures to improve the precision of engine air-fuel ratio control.
As someone who has been driving for a long time, there really isn't a fixed normal number for engine air intake flow. It mainly depends on the type and size of your car and your driving conditions. For example, with my family sedan, the air intake flow at idle might be just 5 to 10 grams per second, but it can easily jump above 20 grams when accelerating. Whether it's normal or not depends on the engine running smoothly without any warning lights on. Factors affecting it include temperature, altitude, and RPM; intake increases when it's cold in winter and decreases at high altitudes. A dirty air filter can restrict flow, and a faulty sensor might give incorrect readings. You can measure the exact value with an OBD diagnostic tool connected to the car, but don't obsess over the numbers—the key is smooth engine power without shaking. Regularly changing the air filter ensures normal operation, making the car fuel-efficient and long-lasting.