Whether the camshaft is in a pushrod engine or an overhead cam engine, it controls the opening and closing of the valves.
This, in turn, controls the flow of air and fuel into and out of the engine which determines engine performance, fuel economy and emissions.
What does it mean if a car is cammed?
“Cammed” means that they put in a different camshaft. The sound changes because the cam is the heart of the engine. It dictates how much air is taken in and put out and for how long, to put it bluntly.
Does a camshaft increase horsepower?
Performance cams increase the duration and timing of the valve openings during the engine stroke, increasing horsepower and making your car accelerate more quickly. You’ll idle slightly rougher with a performance cam, but get a throaty rumble that’s desirable for some gearheads, depending on your vehicle.
How does a cam work?
Camshaft Basics. As the camshaft spins, the lobes open and close the intake and exhaust valves in time with the motion of the piston. It turns out that there is a direct relationship between the shape of the cam lobes and the way the engine performs in different speed ranges.
Photo in the article by “Flickr”