How are exhaust manifolds used in a turbocharged engine?
The configuration of the exhaust manifolds used on turbocharged engines can have a significant effect on the performance of the engine. The turbine casing of the turbocharger has a relatively small throat area in its nozzle section in order to generate a high exhaust gas velocity at the entrance of the turbine wheel.
What causes high pressure in the exhaust manifold?
The small throat area of the turbine casing presents a restriction to the exhaust gas flow from the cylinders and results in a high pressure in the exhaust manifold ahead of the turbine casing.
What is the result of a manifold Division?
The result of this manifold division is a low average pressure in the manifold branches that reduces the pumping loss of the engine, increases power output, lowers fuel consumption, and reduces smoke on acceleration. A schematic diagram that illustrates the exhaust pressure variation in a 6-cylinder engine divided manifold follows:
What does equal length twin scroll turbo manifold do?
This not only helps the motor to better expel its exhaust, but also helps to keep the exhaust velocity as high as possible, aiding in the turbochargers spool and the motors torqueoutput.
Why do you need a runner in a turbo manifold?
Runner volume needs to be considered when building a turbo manifold. While a larger runner diameter does facilitate lower exhaust backpressure for better flow on the top-end, it does cause a lower exhaust velocity. A lower exhaust velocity will cause longer spool times, and less transient response out of the turbo.
Where can I find the 928 Motorsports manifold design?
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