What I think: Cylinder wall themperatures are hotter at higher rpms because heat is being generated at a higher rate. Water circulation rate is also higher and water temperature remains about constant. Water circulation rate decreases at lower rpm so water temp around the cylinders increases. The higher temperature causes water to vaporize (bubbles) around the cylinders which displaces liquid water out the overflow. This is a temporary situation since the water flow slows immediately while the cylinders take time to cool to a lower temp.
If you don't refill the radiator, the water level will decrease to a point where it won't overflow anymore. If you keep the rpm's up for awhile after the load is decreased it may overflow less when rpm's are lowered.
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Today's Featured Article - History of the Nuffield Tractor: Conclusion - by Anthony West. In the last piece I mentioned that Nuffield had reached the stage where they had chosen to drop the "Universal" from production. The two new models were given three figure numbers, instead of "three" and "four". Model numbers were introduced to help farmers and dealers instantly recognize the engine size and horsepower of the tractor, the 4/60 had a four cylinder diesel engine which developed 60 bhp at 2,000 rpm. The 3/42 had a 3 cylinder diesel engine which produced 42 bhp at 2,000 rpm. Th
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