Automotive Engines

1. Automotive Engines Part 5 (Induction)

2. Induction • The term “induction” applies to the pathway for fuel and air to enter the combustion chamber. • Including: • Carburetion • Fuel Injection • Manifolds

3. Carburetors • Rely on the Venturi Vacuum principle • Rated in CFM • 3 Common Styles • 1 Barrel • 2 Barrel • 4 Barrel (square bore/spread bore)

4. Venturi Vacuum

5. 1 Barrel (200 – 400 CFM)

6. 2 Barrel (350 – 500 CFM)

7. 4 Barrel (400 – 1150 CFM)

8. Square Bore Vs. Spread Bore

9. Fuel Injection • Fuel injection atomizes the fuel by forcibly pumping it through a small nozzle under high pressure (15-90 psi). • Throttle Body Injection • Port Fuel Injection

10. Throttle Body Injection • 1 or 2 Injectors for engine

11. Port Fuel Injection • An injector per cylinder aimed at the port opening.

12. Typical Injector

13. Intake Manifold • “Wet” for Carbureted applications • “Dry” for Injected applications • Older manifolds were made from Cast Iron • Modern manifolds are made from Aluminum • Future manifolds will almost always be made of plastic (vinyl, phenolic resin, etc.)

14. Carbureted Intake Manifold

15. Injected Intake Manifold