The Air Duct on the Ram 3500 allows clean airflow to enter the engine for optimum performance. Just beyond the air filter box is the Air Duct, which directs the tremendous airflow a gas engine requires (roughly 10,000 gallons for every gallon of fuel burned). The duct is tightly sealed until reaching the mass air flow (MAF) sensor. This accuracy allows the computer to measure fuel accurately, preventing lean mixtures that wear out pistons, rings, and valves. If dirty unmetered air gets in before the sensor, the Ram 3500 intake will get breached and it will bypass the filter and clog the oil passages with dirt. Throughout the different model years, the Air Duct remained a molded device that engaged with the filter housing and throttle body; however, later 3500 trucks received tighter seals and stronger ribs to resist vibrations. Earlier models of the Ram had smoother walls. The wall of the updated Ram 3500 Air Duct, on the other hand, now has flow vanes to help straighten the airflow and reduce noise. This is the significant difference. Whatever Air Duct is fitted, if fitted in a proper way, it protects the filter, eases the burden on the oil system, and ultimately saves the engine.
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