Quote:
Originally Posted by ADIDASilvias
Thanks for the long explanation, I 100% agree, though I was more considering a vent to atmosphere. It's just usually the response people give when they say they won't run a BOV.
It is something I have explored in depth, and being a mechanical engineer, I understand the reasoning behind exactly what you are saying.
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An engineering perspective: the energy absorbed by the turbine (temp drop and velocity drop in the exhaust system due to molecules transferring kinetic energy to the turbine) is transferred to the compressor wheel, and that energy will be more well conserved when the wheel does not meet any resistance on it's outlet. Resistance to flow in this example being in the form of pressure, which is what the bypass eliminates when pressure is unwanted. This is one of the major keys to achieving a higher fuel economy while using a turbocharger, reducing the pumping loss of the engine by transferring energy from the exhaust molecules to the compressor wheel, which then transfers that energy to the air molecules heading towards the engine which help them move into the cylinder on the intake stroke (as opposed to being "drawn" in by a vacuum created by the descending piston). To this end, we need leak free plumbing (any
leak on the compressor side will cause the exhaust pressure to increase, as the exhaust wheel will put up more resistance due to the higher compressor wheel speed needed to achieve the same flow rate into the engine, since some molecules are now
leaking out)