One thing to remember, is with the increase in RPM's, the water pump and fan blades also turn faster. The faster they turn, the more cooling is going on. So basically, the system is stabilizing itself when the engine RPMs increase. If the fan and water pump didn't likewise fluctuate with engine RPM's, you'd have problems. The problems you are likely wondering about.
Basically the pressure on the cap is created by the heat. If same heat, same pressure on the cap. You can argue flow restriction, and RPMs, and thermostat closed or open, and all that jazz, but it's really the heat that puts the constant pressure against the cap. The rest is really just a minor variable if anything, and if present.
Not sure why your even asking.
The radiator tubes (as many of them that are) should flow water just as fast as through a radiator hose unless cloggage.
As for water pump and a closed thermostat, the pump is pushing water against the thermostat when closed, and not the cap. Kind of like kinking off a garden hose. The pressure would be against the kink, and not the outer end of the hose. In order for a water pump to put pressure on the cap due to closed thermostat, there would have to be back pressure through lower radiator hose which there wouldn't be. But add heat to the scenerio, and there would be. Things would get hotter with closed thermostat.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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