It's very simple to prove whether or not "exhaust density" powers a turbocharger. Just plug your exhaust pipe and see how much boost you get. After all, back pressure increases the density of the exhaust gasses.
The correct answer, which isn't on your list, is "exhaust energy". Specifically, it's the enthalpy of the exhaust gas leaving the turbo subtracted from the enthalpy of the exhaust gas entering the turbo. Combustion of unburned fuel COULD contribute to the exhaust energy, but 1) modern gas and diesel engines don't have a lot of unburned fuel leaving the combustion chamber, and 2) the fuel would have to burn prior to entering the turbo in order to contribute to the exhaust enthalpy.
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Today's Featured Article - Restoration Story: 1964 JD 2010 Dsl - Part 2 - by Jim Nielsen. Despite having to disassemble the majority of my John Deere 2010's diesel engine, I was still hopeful I could leave the engine-complete with crankshaft and camshaft-in the tractor. This would make the whole engine rebuild job much easier-and much less expensive! I soon found however, that the #4 conrod bearing had disintegrated, taking with it chunks of the crankshaft journal. As a resul
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