What is exhaust

exhaust headers

Glossary “exhaust headers” Definition:
1). Term used for exhaust manifold. 2). A special exhaust manifold with tubes of equal length from the exhaust ports to the header of the exhaust system.

exhaust manifold

Glossary “exhaust manifold” Definition:
Component, generally of cast iron, with passages of unequal lengths that carry the exhaust gases from the exhaust ports to the header of the exhaust system.

exhaust gas oxygen

Glossary “exhaust gas oxygen” Definition:
Amount of oxygen present in the exhaust stream, as measured by an oxygen sensor and reported to the computer in closed-loop, feedback systems to aid in the control of the air/fuel mixture.

exhaust gas recirculation (EGR)

Glossary “exhaust gas recirculation (EGR)” Definition:
Emissions control system that reduces an engine’s production of NOx by diluting the air/fuel mixture with exhaust gas so that peak combustion temperatures in the cylinders are lowered.

exhaust analyzer

Glossary “exhaust analyzer” Definition:
Automotive test and service device that uses a process involving infrared energy and sensors to determine and display the composition of an engine’s exhaust gases, such as: HC, CO, CO2, O2, and NOx. Some types may also measure sulpher compounds and particulates.