I'll stay thanks all the same (and no need for any personal attacks from you either)... this is an interesting subject

Sounds like a fairly good way of modeling it to me.

All it comes down to is how fast you loose the coolant and in my opinion that should depend on the location, how much damage is incurred and what you are doing with your engine.

I have many times seen 109s and spits venting light coloured vapour from the radiator area and after a while it stops coming out but the plane continues to fly on at combat speeds.
I wondered if this was maybe coolant or fuel. But it comes from the radiator. I recall being hit like this and my engine giving out sometimes and other times it flys on as if nothing happened. I think it needs some testing to get a better sense of what is really happening.