Four Stroke Engine Overview

Overview

As the name implies, there are four strokes that each cylinder in a four stroke gasoline engine. There are tons of YouTube and web pages that discuss the history, theory, and operation of the Four Stroke. This web page will just focus on high-level topics that will allow me to discuss other topics that will help you begin your journey on an automotive DIYer. So, let's begin. Here are the four strokes:

Intake	Compression	Power	Exhaust
Piston Moving Downwards Intake Valve Open Injector On Exhaust Valve Closed Spark Plug Off Cylinder Contents Air/Fuel mixture drawn in	Piston Moving Upwards Intake Valve Closed Injector Off Exhaust Valve Closed Spark Plug Off Cylinder Contents Air/Fuel Mixture being compressed	Piston Moving Downwards Intake Valve Closed Injector Off Exhaust Valve Closed Spark Plug On Cylinder Contents Expanding gas	Piston Moving Upwards Intake Valve Closed Injector Off Exhaust Valve Open Spark Plug Off Cylinder Contents Exhaust Gas being pushed out

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