EXHAUST SYSTEMS - Defender（排气系统后卫）.pdf

EXHAUST SYSTEMS Why use a water-injected “wet” A waterlock (see pages 65 to 69) will collect the cooling water exhaust system? present in the system when the engine is stopped. In addition, a waterlock has great sound-deadening capabilities and acts as The following factors are of great importance: a very effi cient muffl er. The size of the waterlock is not only 1) Exhaust gas temperatures can reach very high levels. A diesel determined by the diameter of the exhaust hose, but also by the engine can easily produce an exhaust gas temperature of quantity of water that must be collected. Therefore, VETUS offers 600°C(1100°F) or more. waterlocks with extra large capacity for systems with long exhaust runs. 2) The speed with which sound can be transmitted through air is dependent on the temperature of the air. This applies to exhaust gases as well. The higher the exhaust temperature, A gooseneck (see page 70) raises the exhaust hose above the the higher the speed of sound through the gas. waterline, so that water cannot backfi ll the exhaust system. 3) The sound level, i.e. the relative volume of sound as After the engine is stopped, all cooling water in the exhaust experienced by the human ear, is in turn dependent on the hose will run to the lowest point of the system, which is where speed of sound. As the speed of sound transmission reduces, the waterlock should be situated. In order to limit the quantity so the sound level will reduce proportionally.