What is a exhaust cam?

An exhaust camshaft is a rotating component in an internal combustion engine that controls the opening and closing of the exhaust valves. Its precisely timed rotation allows the spent exhaust gases to be expelled from the combustion chamber, making way for the next intake stroke. It works in coordination with the intake camshaft, though they don't always have identical profiles (the shape that dictates how long and when the valves open and close). The exhaust cam's profile is designed to ensure efficient expulsion of exhaust gases while minimizing overlap with the intake stroke.