[IceFire]

Spitfire LF.IXe CW +25lbs
Crimea, Noon
1000 meters
Throttle 110%
Rads Auto
Overheat at 1:19
Engine inoperable at 2:29

I-185M-82A
Crimea, Noon
1000 meters
Rads Closed
Throttle 100% (no 110%)
Forzah (Boost) On
Overheat at 1:31
Engine inoperable at 2:51

Ta152H-1
Crimea, Noon
1000 meters
Throttle 110%
Rads Auto
MW50 (Boost) On
Overheat at 0:52
Engine damage at 6:50
Engine inoperable at 10:11

I'm seeing a bit of a different picture here. It was the Ta152 that went on and on and on while the Spitfire +25 died after only a couple of minutes. I should mention that this would constitute an extreme example. Full throttle with boost on and using default radiator settings. Twice that was auto and once that was closed. I imagine the I-185 might last a bit longer in this test if I opened the radiators.

EDIT: I also redid the test on the Spitfire (same model)... it was 3:42 seconds before the engine died completely.