Hi everybody, I crossed half of Europe, the Mediterrainean Sea and reached the Moroccan Atlas. What became obvious since riding the highways in south of Spain is the that the coolant temp rises on long-stretched up-hill sections.
Even more now in Morocco on the steep pass roads. It is 1/5 of the whole range left to the red mark. Then I go very low throttle or turn over and let it cool down in idle. The needle always comes down to the center of the gauge range and stays there as usual until the next climb. Never had issues with increased heat but ambient temperature over here is 38°C and exceeds sometimes the 40°C mark. I intended to go until Merzouga Drâa-Tafilalet but do not dare because of even more heat in the Sahara. Any ideas how to improve the heat capability - not for immediate - but as a preventive action when back home? Does a larger radiator core really help as flow rate depends on the anatomy of the water pump and the engine revs. And will the thermostat constrict too much? What about a larger oil cooler mounted on top of the engine (with fans) and a ventilated hood?
Cheers
Even more now in Morocco on the steep pass roads. It is 1/5 of the whole range left to the red mark. Then I go very low throttle or turn over and let it cool down in idle. The needle always comes down to the center of the gauge range and stays there as usual until the next climb. Never had issues with increased heat but ambient temperature over here is 38°C and exceeds sometimes the 40°C mark. I intended to go until Merzouga Drâa-Tafilalet but do not dare because of even more heat in the Sahara. Any ideas how to improve the heat capability - not for immediate - but as a preventive action when back home? Does a larger radiator core really help as flow rate depends on the anatomy of the water pump and the engine revs. And will the thermostat constrict too much? What about a larger oil cooler mounted on top of the engine (with fans) and a ventilated hood?
Cheers
quickly! Steam has a lower convective heat transfer coefficient than water. Thus when steam patches or bubbles form on the heat transfer surface (internals of radiator, water jacket, etc.) they effectively insulate the surface from water making heat difficult. As the steam coverage of the heat transfer surface increases the temperature of the surface increases radically and heat shed from the surface decreases. This unstable situation continues until the affected surface is covered by an envelope of steam. At this point there is no contact between the heat transfer surface and the water in the center of the flow channel and Film Boiling is achieved. It is also at this point or not long 
after that something within the cooling system relieves pressure - hopefully the 13 psi rated cap and not the head gasket.
