03-07-2019, 02:34 PM
I too am in France (SW) and if you search under "Vapour Lock" you will see that on a very hot day, the water temp of our 1932 RN was still only 69 deg C. That is with a modern cored radiator albeit with a false honeycomed mesh in front of it to make it look right, a 4 blade fan and nothing else. My problem is Vapour Lock as the bulkhead tank gets pretty hot. I have now taken advice and re-fashioned the fuel pipe to have a horizontal expansion loop and await some exhaust bandage.