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If I ever get my sprintfire project going I plan to do just that, 5 thermocouples along the inlet side of the head. They won't be robust enough on my budget to be a permanent fit. I'm interested to compare the results with standard cooling plumbing vs TR7 sprint plumbing. I expect to find less temperature gradient across the head with the rear water outlet fitted.
Hope you do manage to conduct this testing Julian.
From a Ted Middleton article in Dolly Mixture, I gather the hottest part of a slant four cooling system is the back of the cylinder head. With that in mind
I have the heater inlet on my 1850 plumbed into the transfer housing (early 1850s have plugs fitted, so it is a case of (carefully) removing that and fitting
a hosetail). On the usual water/antifreeze coolant the performance of the heater is dramatically improved over standard.
Now I using Evans waterless coolant. It seems the heater is not as good, which if true suggests that the coolant no longer has the back of the head as a hotspot?
Tony MacKillop has an article coming up in DM on his observations of EC in a standard 1850.
I suggest your experiment will be usefully expanded to not only compare cooling systems but also different coolants.
Ian.