Mk.I could go up to 3,000 RPM for max power, but had limitations imposed for how long you could run it like that in addition to the temperature limits.
I can't speak to other Sims except Cliffs of Dover, but there seems to be this entrenched idea that engines automatically blow up if you exceed the time limits by two seconds. That and the host of features that seem on the surface to be realistic, but don't really have a lot to do with reality is why I never could get into it. For being so hyperdetailed they got a lot wrong, including things CFS3 got right 15 years ago.
Realistically, speaking in general terms, the temperature limits are fairly hard limits. Exceed them by much and things will start to bend, brake, and blow out. Time limits have more to do with preserving the engine's health over time. Keep everything else within limits and it could run quite a while even at emergency power. It would certainly have been done on test stands as part of the development process. The downside is the engine won't last as long if you do this, and the stress might induce hidden issues that eventually manifest themselves dramatically on some later flight. This would be a really cool feature if the WOTR campaign tracked how you treated your engine and made random failures more likely on later flights if you don't treat it right.
