4.1 Intake air temperature control system: When the engine is cold, the choke is open and hot air from the exhaust manifold enters the carburetor
1. Vacuum diaphragm; 2. Air intake pipe; 3. Air filter; 4. Temperature sensor; 5. Vacuum from the intake manifold; 6. Exhaust manifold; 7. Heat shield; 8. Air duct; 9. Hot air; 10. Air damper; 11. Cold air
1. The system reduces the content of carbon dioxide and hydrocarbons in the exhaust gases, reduces the engine warm-up time and reduces carburetor icing. The temperature of the incoming air is regulated by an air damper located in the intake manifold, regulating where the air comes from: from the atmosphere, from the exhaust manifold or from both sources (4.1).
2. The position of the valve is regulated by a vacuum diaphragm. A temperature sensor in the air filter housing controls the flow of vacuum to the diaphragm.
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