Thermostatically Controlled Air Cleaner

Air cleaner incorporates a valve assembly, which comprises a metal box fed by two air inlets, one for normal cold air intake and the other forming a hot air intake from separate heat stove around the exhaust pipe. Enclosed in the box is a spring loaded flap valve which pivots to control proportions of hot and cold air entering engine. A thermostatic bulb is connected through a spring linkage to flap valve. As engine warms up, air is drawn through hot air intake over thermostatic bulb and into air cleaner. When air temperature reaches approximately 90°F, thermostatic bulb expands and begins to force flap valve down. This allows cold air to enter and mix with hot air. Hot air intake is completely closed when intake air temperature reaches 95° to 105°F.