Four-Stroke Engines

Four-stroke engines use four steps called intake, compression, power, and exhaust.

How It Works

The intake stroke pulls air and fuel into the cylinder. The compression stroke squeezes the mixture.

Why It Matters

The power stroke happens when burning fuel pushes the piston down. The exhaust stroke pushes used gases out of the cylinder.

Fun Facts

• The intake stroke pulls air and fuel into the cylinder.
• The compression stroke squeezes the mixture.
• The power stroke happens when burning fuel pushes the piston down.
• The exhaust stroke pushes used gases out of the cylinder.

Did You Know?

Engineers study four-stroke engines by testing, measuring, improving designs, and learning from real-world use.