Good info 'waffle'.
I don't believe the argument is what we're calling this process, EGR, Exhaust Gas Restriction, Exhaust Gas Backpressure Enhancement, etc...
The point of the argument is whether the retainment of burned gasses will speed the process of coolant temperature increase.
That's why we're proposing a test here -- to find out. We don't know exactly what is going on -- I'm far from either a Vehicle Mechanic or Physicist, so I can't tell you. I can only rely on Internet research and proper experiments with my own vehicle.
RH77
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“If we knew what we were doing, it wouldn't be called research” ― Albert Einstein
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