Only two valves are needed to do this. When an engine has three or four valves in each cylinder, it's because the designer decided that for breathing or cooling he wanted to double the number of ...

The automotive industry continues to be a hotbed of innovation, with activity driven by the need for enhanced driving experience, better fuel economy and speed efficiency, and growing importance of ...

An engine is like a safe deposit box with two locks. You can unlock one of these with such keys as carburetors, manifolds and ignition. But you can't open it up and get all the performance you want ...