But any pressure built is relieved by the bypass hose if and when the thermostat is closed. If you still think there's pressure there just from the pump, start your engine when cold, rev it up for a minute, then remove the radiator cap. Bet you won't hear any pressure built when you crack the cap.
Pressure makes things cooler as we all learned in Cooling 101.
Warning hot liquid inside!
You were the one who claimed pressure built by the pump, added to the pressure in the systemSo, if that were true, some of that pressure would escape thru the radiator when you cracked the cap open.
not true. pressure increases heat, but it also increases the boiling point of a liquid.
It comes from both..
Absolutely wrong. There is not enough flow out of the thermostat to build a bunch of pressure from the thermostat, through the radiator, and back to the pump. That's why the pressure is built in the block.
As far as checking the pressure built by the pump only, you can't really measure that at the radiator cap. If you take the thermostat out, there is no restriction for which to build pressure. If you leave it in, there is no way of determining what pressure is made by the pump and what is made by the temp increase. Once the thermostat opens, the temp is already hot and building pressure.
It's easy to tell if there is pressure in the block. Put a pressure gauge behind the thermostat and see what's there. According to what you're saying, if you put a pressure gauge behind the thermostat and started an engine cold, so the thermostat is closed, there would be no pressure in the intake. Would you like to try it and see what the results are? It would clear this all up.
The pressure (if any) will depend on the pump impeller, in many stock pumps there are three sized impellers, small(low volume-high rpm) medium(std volume) and large(high volume, these are listed as Police/taxi pumps and/or extra cooling. The small and medium obviously won't build any pressure to speak of, there's too much clearance between the impeller and pump body. The bypass hoses are typically 5/8" diameter, although I've never tried it, it's not hard to imagine feeding 55 gpm thru a hose this size. Maybe I'll try it on the 55 gal drum I behind the shop when I get time.
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