In a diesel engine, the better the combustion is, the more droplets of fuel are spread out. As
the firing pressure goes up, the dispersion gets smaller. As time goes on, operating pressures are raised to
improve combustion. This leads to better fuel efficiency, cleaner exhaust gases, and less unburned fuel or
unwanted gases.
When diesel locomotives change gears, there are surges of pressure that can be up to three times the normal
operating pressure.
When diesel locomotives change gears, there are surges of pressure that can be up to three times the normal operating pressure. (Pressure as high as 1800 bar) To make sure fuel injection tube assemblies can handle these pressure changes, they go through a process called "Autofrettage." This creates hoop stresses in the walls, which stops cracks from spreading and prevents them from breaking. Apollo is taking care of this.
The Fuel Injection Tube assembly moves fuel from the fuel pump to the injector, and its outside diameter (OD) keeps getting bigger and smaller.
