What are the functions of exhaust gas flaps?
What are the functions of exhaust gas flaps?
Exhaust gas flaps can fulfil a variety of functions in the exhaust system. They are used for a wide variety of functions, both with spark-ignition engines as well as with diesel engines. In acoustical optimisation, exhaust noises are influenced by adapting the volumes and pipe lengths of silencers.
How does the exhaust brake work on a car?
This consists of a hydraulic pressure pump which is connected to the butterfly valve. This pump controls the operation of butterfly valve in following manner: When brakes are applied by the driver, the cylinder reduces its pressure so that the valve closes and restricts the path of exhaust gases.
What’s the maximum working pressure of an exhaust brake?
Under these conditions, the exhaust flow from the cylinders is bottlenecked and rapidly builds pressure in the exhaust system upstream from the exhaust brake. Depending on engine speed, this pressure can easily reach up to 60 PSI maximum working pressure. Maximum working pressure is limited as part of the design of an exhaust brake.
What happens when the brakes are released on a car?
When the brakes are released by the driver, the cylinder generates pressure so that the butterfly valve is opened and allows the exhaust gases to flow into the exhaust pipe. In this position the butterfly valve remains parallel to the path of exhaust gases and thus releases the pressure on the engine and allows its speed to increase.
Exhaust gas flaps can fulfil a variety of functions in the exhaust system. They are used for a wide variety of functions, both with spark-ignition engines as well as with diesel engines. In acoustical optimisation, exhaust noises are influenced by adapting the volumes and pipe lengths of silencers.
How does an exhaust brake system work on a car?
So, how does an exhaust brake work? Essentially, it works by trapping engine pressure in the exhaust system, which in turn forces the engine to rotate slower (backpressure). Normally, pistons travel upward in their cylinder bore to force spent exhaust gasses out of the engine via the exhaust valve.
Where is the exhaust gas flap on a BMW 7 Series?
In the new BMW 7 series, one of the two tailpipes on the rear silencer is equipped with an exhaust gas flap and, as a result, always provides the right “sound” of the twelve-cylinder engine, throughout the entire speed range. Below: BMW 7 series
How does a diesel engine brake system work?
Diesel powered vehicles do not benefit from the same level of engine braking as gasoline powered vehicles enjoy. In a typical car or light truck, letting off the accelerator results in vehicle speed reduction beyond simple friction associated with moving an object through air and across a roadway.
