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Alright, let’s tell the “720 degrees” story — like a tiny engine doing a four-part dance. Stroke one: **Breathing in.** Picture the cylinder as a hungry little mouth. The piston slides down, and it’s like the engine goes, “Ahhh,” and **inhales** an air-fuel mix. Smooth, easy, like sipping through a straw. Stroke two: **Squeezing.** Now the mouth closes. The piston goes up and **squeezes** that mix like a hand crushing a sponge. Tighter, tighter… building energy. No fireworks yet — just pressure getting ready. Stroke three: **Push.** Here comes the drama. Spark! And it’s like a tiny popcorn kernel *finally* pops. The expanding gases **slam the piston down** — this is the big shove, the “GO!” moment. Imagine a strong friend pushing you on a swing. This is the stroke that really feels powerful. Stroke four: **Breathing out.** Last one: the engine exhales. The piston comes back up, and it’s like blowing out through a straw, pushing the used gases out. “Phew!” Clean out the room… ready to start again. Now stitch it together: inhale, squeeze, push, exhale. And the whole story takes **720 degrees** — that’s **two full turns** of the crank. Quick verbal self-check: 1) **Which stroke actually makes torque?** 2) **How many crank revolutions per full cycle?** Nice! If you can say those two answers out loud, you’ve basically got the four-stroke engine rhythm locked in.
Course
Modern Passenger Car Systems: A Practical Beginner’s Guide
9 units41 lessons
Topics
Automotive TechnologyAutomotive EngineeringMechanical Engineering (applied, low-math focus)Electrical and Electronic Engineering (automotive focus, conceptual level)Computer Engineering / Embedded Systems (ECUs, OBD, networks, conceptual level)Control Systems / Mechatronics (modern electronically controlled systems, conceptual)
About this course

Explore how modern passenger cars work as integrated systems, from the engine to the taillights, using clear, low-math explanations. The focus spans the internal combustion engine, its support systems, and how power flows through the drivetrain to the wheels. It covers steering, suspension, braking, and the fundamentals of automotive electrical and electronic systems including ECUs, sensors, and vehicle networks. Safety, comfort, and driver-assist systems are introduced conceptually, along with practical maintenance basics and simple diagnostic approaches for real-world understanding.