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Anatomy of a Combustion Engine

Short answer: In a four-stroke internal combustion engine, a piston draws in fuel and air, compresses it, and in gasoline engines a spark plug ignites it; diesel engines ignite the mixture by compression alone.

The expanding gas pushes the piston down, turning the crankshaft, and the exhaust stroke clears the cylinder. The footage shows cutaway views of an engine and ignition in slow motion.

VideoWrite-up2 sources
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What should you know about Anatomy of a Combustion Engine?

Quick facts. Each one stands alone and has a stable ID you can cite.

  1. Intake, compression, power, exhaust.

    DD-334-F01 · Write-up · Exhibit A (Four strokes)

  2. Gasoline engines use spark plugs.

    DD-334-F02 · Write-up · Exhibit B (Spark)

Video transcript: Anatomy of a Combustion Engine: A Car Engine Runs on Thousands of Tiny Explosions a Minute

Did you know, combustion engines work by burning fuel to produce mechanical energy. Inside the engine, a mixture of fuel and air is compressed in a cylinder. A spark plug ignites the mixture, causing a small explosion, which pushes the piston down. This movement turns the crankshaft, converting the energy from the explosion into rotational force. The process repeats rapidly, producing the power that drives the vehicle. Combustion engines typically run on gasoline or diesel, and rely on a cycle of intake, compression, combustion, and exhaust to keep functioning. NOW YOU KNOW!

Burned-in captions, read frame by frame (see transcript.md) · 27.1s Reel ·

Video coming soonAnatomy of a Combustion Engine · Instagram Reel
Anatomy of a Combustion Engine: A Car Engine Runs on Thousands of Tiny Explosions a Minute Instagram Reel · · 27.1s

The write-up

A car engine runs on thousands of tiny explosions a minute. The four-stroke cycle turns them into rotation.

  1. Exhibit A

    Four strokes

    Intake, compression, power, exhaust.

  2. Exhibit B

    Spark

    Gasoline engines use spark plugs.

  3. Exhibit C

    Diesel

    Diesels ignite by compression.

  4. Exhibit D

    Piston

    Gas pushes the piston.

  5. Exhibit E

    Crankshaft

    The crankshaft turns.

Questions people ask about Anatomy of a Combustion Engine

Which stroke follows intake?

Squeeze.

Source: Write-up · Exhibit A (Four strokes) · Wikipedia: Four-stroke engine

What ignites gasoline?

Electric spark.

Source: Write-up · Exhibit B (Spark) · Wikipedia: Internal combustion engine

How do diesels ignite?

Hot air.

Source: Write-up · Exhibit C (Diesel) · Wikipedia: Internal combustion engine

What does the piston turn?

Linear to rotary.

Source: Write-up · Exhibit D (Piston) · Wikipedia: Internal combustion engine

How many strokes in the cycle?

Four-stroke.

Source: Write-up · Exhibit E (Crankshaft) · Wikipedia: Internal combustion engine

Test Your Knowledge

All quizzes →

5 questions, all from this case file. Answers are revealed instantly.

  1. Which stroke follows intake?

    1. Compression
    2. Exhaust
    3. Power
    4. Idle
    Show the answer

    Answer: A. Compression Squeeze. Source: Write-up · Exhibit A (Four strokes) · Wikipedia: Four-stroke engine

  2. What ignites gasoline?

    1. A spark plug
    2. Compression only
    3. A match
    4. Sunlight
    Show the answer

    Answer: A. A spark plug Electric spark. Source: Write-up · Exhibit B (Spark) · Wikipedia: Internal combustion engine

  3. How do diesels ignite?

    1. By compression
    2. By spark
    3. By flame
    4. They don't
    Show the answer

    Answer: A. By compression Hot air. Source: Write-up · Exhibit C (Diesel) · Wikipedia: Internal combustion engine

  4. What does the piston turn?

    1. The crankshaft
    2. The steering wheel
    3. The radio
    4. The tires directly
    Show the answer

    Answer: A. The crankshaft Linear to rotary. Source: Write-up · Exhibit D (Piston) · Wikipedia: Internal combustion engine

  5. How many strokes in the cycle?

    1. Four
    2. Two always
    3. Six
    4. One
    Show the answer

    Answer: A. Four Four-stroke. Source: Write-up · Exhibit E (Crankshaft) · Wikipedia: Internal combustion engine

Cite this case file

Easterling, Marcus. "Anatomy of a Combustion Engine." The Detail Department (DetailEnjoyer), case file DD-334, last updated Sep 29, 2024. https://detailenjoyer.com/case/anatomy-of-a-combustion-engine/

Permalink: https://detailenjoyer.com/case/anatomy-of-a-combustion-engine/ · Last updated

Markdown version

Cite a single fact by its ID, for example DD-334-F01 → https://detailenjoyer.com/case/anatomy-of-a-combustion-engine/#DD-334-F01