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Originally Posted by ChazInMT
Could you explain how this works please, or point me to a website that says this and explains it.
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You do not burn the engine. You burn the fuel which gives up energy that was stored in it. The engine is just a device that converts energy from one form to another. It does not create or destroy energy. No engine is 100% efficient at converting one form to another so you can sometimes recover energy that is lost with another engine. Regardless the energy to drive both comes from the fuel.
I'm guessing you think that all the energy to spin the turbine comes from the piston pushing the exhaust out of the cylinder. That contributes some energy to driving the turbine but the vast majority of the energy comes from residual pressure in the cylinder at bottom dead center. The exhaust valve opens here and all this left over pressure escapes (known as blow down).
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If you read what I wrote, I said the turbocharger improves the efficiency of the engine several times. So why do you write this?
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Probably because you keep stating that a turbo bogs down the engine and if it were there would be no net gain.