Heated and unheated air intake system of an I.C. engine air cleaner

摘要

An air cleaner 1 has a duct 3 connected by way of a temperature controller 6 with a gate 7 to a heated air duct 4 and an ambient air duct 5. At least one of the ducts 4 and 5 is provided with at least one calibrated hole 8 or 9 positioned at a location to reduce sound propagation. Specific hole dimensions and spacings from the open ends of the ducts together with relative duct cross-sections are disclosed.