Four Stroke Engine 3 & 4

Place them In order

• Exhaust Valve

• 1. Exhaust Gases

• Piston

• Crankshaft

In when the spark plug ignites the___ mixture inside the combustion chamber at a specific moment toward the end of the______

• power stroke.
• exhaust stroke.
• Air/Fuel

• compression stroke

Abnormal Combustion: May be caused by one or more of the following:

• Detonation

• Incorrect fuel mixture
• Faulty spark plugs
• Clogged air filter

Four-Stroke Fact: _____ and detonation are very closely associated and are often interchanged

• ignition
• combustion
• compression
• Pre-Ignition

Pre-Ignition: Occurs when the air/fuel mixture is ignited before____fires

• compression stroke
• exhaust stroke
• spark plug
• intake stroke

Example Of Pre-Ignition

• Glowing Electrode

• Ignition after the spark plug fires.
• Ignition before the spark plug fires.
• Ignition caused by excessive heat in the combustion chamber.

Detonation is____

• the release of energy from a substance through a chemical reaction.
• the slow combustion of a substance due to an explosive reaction.
• Is an uncontrolled and spontaneous auto-ignition

• the process of converting a solid into a liquid state.

____ Which causes combustion pressures to rise too quicklu

• detonation
• pre-ignition
• spark plug failure
• fuel injection malfunction

Detonation: Create very high and very sharp

• pressure

• ignition
• burst
• blast

Condition is known as a combustion____

• Fire
• Know

• Explosion
• Ignition