This Honda CBR600RR engine has eight exhaust valves and they are quite small—22mm in diameter. All of the valves are exposed to combustion heat, but exhaust valves are heated twice. When the valve ...

If we tell you that some folks take engine components made with a highly explosive metal, put them under the hood in one of the hottest parts of the motor, and then rely on those parts to actually ...

EGR stands for exhaust gas recirculation, and the EGR valve is part of a system that does as the name implies: recirculate exhaust gas back into the engine’s intake manifold for a return trip to the ...

The German arms and automotive company, Rheinmetall, announced on Tuesday that it will begin to manufacture exhaust gas recirculation valves or EGR for a "renowned car manufacturer" that it did not ...

Having already had engine problems with a Toyota Avensis 2.0 D4D, purchased new in April 2007 (lower engine replaced at 2 years old due to high oil usage - replacement did not resolve problem - plus ...

Original engines in cars built before the early 1970s generally don't have hardened exhaust seats that are resistant to unleaded gas. Nevertheless, tests conducted in the mid-1970s by the U.S. Army, ...

A Cessna 172 experienced a rough-running engine, which troubleshooting identified as an issue with exhaust valves in specific cylinders due to unusually low temperatures. The unscheduled maintenance ...

One reader wrote in to propose that perhaps valve springs might be cooled by making them hollow and filling them with sodium. Actually, all that liquid sodium can do (it is liquid above 208 degrees ...