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Unit 13
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 Import questions





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