In a Roosa master type injection pump, what do the pistons follow to pressurize the fuel?

In a Roosa master type injection pump, the pistons follow the cam ring to pressurize the fuel. The cam ring is a crucial component that provides the necessary motion to the pistons as it rotates. When the engine is running, the cam ring's contour pushes the pistons in a reciprocating motion, causing them to draw in fuel and then compress it to high pressure. This pressurization is essential for properly injecting fuel into the engine's combustion chamber at the correct timing and quantity.

The design of the cam ring allows for the adjustment of the fuel delivery and timing, making it a fundamental aspect of the pump's operation. By understanding the role of the cam ring, one can appreciate how effective fuel injection contributes to engine performance and efficiency.