Glossary: Engine Blocks and Cylinder Heads

The U.S. system of weights and measurement was established by the U.S. National Bureau of Standards. This U.S. system is loosely based on British or Imperial Weights and Measures.

The ammonia produced from the urea reacts with the nitrogen oxide emissions and is converted into nitrogen and water within the catalytic converter.

A category of CR fuel systems operating above 29,000 psi (2000 bar). These systems are typically pressurized by EUPs that are driven by engine camshafts.

Volvo–Mack’s term for a high-pressure common rail injection system using two pumping injectors to supply pressurized fuel to the fuel rail.

Volvo–Mack’s name for a high-pressure injection system using Delphi’s E3 unit injector.

A combustion chamber with carefully designed, piston-formed combustion chamber bowls that resist the formation of soot. ULPC pistons are identified by stepped-shaped bowls that better mix air and fuel.

Fuel that has a maximum sulfur content of 15 ppm.

A semiconductor device made of either P or N material that conducts current through only one material.

A device used by VGTs to rotate the nozzle ring vanes together simultaneously.

An ammonia-carrying molecule that is dissolved in water to form DEF. It is selective for oxygen in NOx molecules rather than oxygen in the exhaust.