A quick summary after watching all the videos posted here, and following the discussion.
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Lets not get too carried away...
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Precisely that. Like someone already stated that these flames are deliberately overdone.
There are few factors we should consider when talking about (visible) engine exhaust flames:
- All videos show planes standing or taxiing on the ground.
- Although visible on many videos, most of us will agree that they are barely visible - or invisible during daylight.
Thus I will point out to three videos which IMHO more accurately represent what should (can) be seen in real life and thus in the game.
"Seafire night ground run" - watch how high RPM affects engine exhaust:
The thing everyone forgot to mention is a very fast stream of air which is blowing over the exhaust stacks (with higher RPM) - undoubtedly much faster and colder once the plane is airborne => further reducing the exhaust flames length because of the fast air stream and also a small portion due to forced convection (cold air cooling the exhaust pipes).
Just like Oleg said:
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Please read with atention: The color of exhaust from the direct pipe and from the extended are different. The temperatue of the flame decreasing with the longer leght of pipe. More lower temperature...
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"Spitfire MH 434 - Part 3/5" - this, I believe is how the flames should be represented in the game, starting from 5:30 (fast forward) first the engine start is shown and then camera shows directly into the exhaust stacks:
After slightly over primed start the only visible flames are during engine start (due to some fuel left from previous unsuccessful attempts). Once the engine has been started watch how there are no flames exiting the exhaust pipes, even when RPM is increased - although they are visible under the right angle (when looking directly into the exhaust pipes like shown in the video).
And last, the most important video IMO... "Bf 109 Stack Flaming" - posted by Richie, which although doesn't feature exhaust flames, it shows exhaust smoke when changing throttle:
If I would have to choose between the right colored exhaust flames and correctly represented puffs of smoke when changing throttle => I would without a doubt choose the latter because it impacts gameplay and is overall more important feature.