Thermostatically Controlled Air Cleaner
Provides carburetor with air at a temperature above 90°F during normal operating conditions. Air cleaner incorporates a metal box fed by two air inlets, one forming normal cold air intake horn, the other taking hot air from a separate heat stove around exhaust manifold. Enclosed in box is a spring loaded flap valve which pivots to control amount of hot and cold air entering engine. A thermostatic bulb is connected through a spring linkage to the flap valve, the bulb being exposed to incoming air. During engine warm up, air is drawn through hot air intake over thermostatic bulb and into air cleaner. When air temperature reaches approximately 85°F thermostatic bulb expands and begins to force flap valve down. This allows air from engine compartment to enter duct, mix with hot air and enter carburetor. If engine compartment air reaches 110°F, valve plate will move towards down position and completely shut off hot air intake.