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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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