[T-Cut]

I've always had a radical (scientist's) view on this. Most petrol engines run in the mid-90s and members are perfectly happy with that. They'll almost certainly worry of it drops to much below 90°C. Why should a diesel not be encouraged to run in the same range? By doing so, its inherent thermal efficiency will be better utilised. Though using different fuels, they're both heat engines, so keeping the block 'cool' reduces the energy available for work. I remember reading a comment from a forum member who was associated with a haulage company running lots of lorries. To minimise operating costs, their philosophy was to keep their diesel engines 'hot enough to fry eggs'.

EDIT: Just to add the point that actually getting the M47R to reach 90°C as the normal running temperature may not be easy to arrange. Some examples also run cooler than others, but the in-line stat modification generally proves that it can be done. I guess the question is how far?

TC