Yes, reliability and predictability is important. Regarding 'specified' running temperature, I don't think the stat setting necessarily tells you that. Any engine can reach a running temperature somewhat higher than the stat's nominal opening point. Petrol engines do so as a matter of course. Once the stat's fully open, the radiator fan will moderate things when it goes higher. It's all a question of balance. As far as MGR was concerned, 'normal' running was up to 115C. I realise many of us would freak out well before that point, but if everything works as intended, it will cope fine. The engines have ample cooling capacity - providing the radiator fan works by the book.
In my opinion, the area that might limit the 'maximum' running temperature is the quality of the rubber hoses. Some MGR ones are on the decidedly flimsy side for running up to 22psi.
TC
Last edited by T-Cut; 5th October 2020 at 21:03..
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