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Unit 13

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  • What is the ideal air-fuel ratio for diesel engines?
    25:1
  • What causes the power stroke?
    Spark plug ignition
  • When does combustion happen?
    Power stroke
  • What happens with a very lean mixture?
    Overheating
  • What is the temperature during combustion?
    3000–4000°F
  • Why is compression important?
    Increases power
  • What does a rich mixture contain?
    More fuel
  • What is the pressure during combustion?
    30,000 psi
  • What does a stoichiometric mixture mean?
    Perfect mix
  • What happens during the exhaust stroke?
    Burned gases exit
  • What is the ideal air-fuel ratio for gasoline engines?
    15:1
  • What enters the cylinder during the intake stroke?
    Fuel-air mix
  • How many strokes are in one full cycle?
    4
  • What helps remove leftover gases?
    Valve overlap
  • What does the camshaft do?
    Control valve timing
  • What compresses the fuel-air mix?
    Piston
  • What controls valve timing?
    Camshaft
  • What is valve overlap? (A). Both valves are closed (B.) Intake valve opens early (C.) Exhaust valve opens late ( D.) Both valves are open briefly
    (D.) Both valves are open briefly
  • What is the role of the spark plug?
    Ignite fuel-air mix
  • What part converts piston movement into rotation?
    Crankshaft
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