allencr wrote:All that old tired BS about 'flowing too fast to cool' if the thermostat is removed is an old wives tale that just refuses to die. There are times when a restriction in the cooling system increases pressure between it & the pump to stop the surface bubbles coming from around really hot exhaust ports. Higher pressure cap does the same thing. The usual Toyota thermostat position at the pump inlet isn't one of those times that would make the myth seem true.
This, I agree with. Within reason, you're not going to be able to make water flow so fast it negatively affects the cooling system, low flow rates can be a problem however. Carrol Smith was an advocate of placing a restriction on the outlet of the engine to increase the water pressure within the block, to help prevent localised boiling. Agreed on the thermostat positioning on the 3S engine too, since it is in the flow path AFTER the radiator, it is effectively regulated by the radiator cap anyway so it's likely to not have much effect.
Also forget all the 'magic' stuff that is supposed to work better then plain water, if it does, its only in a lab & barely measurable.
Not sure if I agree on this point, water wetter reduces the surface tension of water and allows it to more effectively "wet" the surfaces it's cooling, basically increasing the surface area available for heat transfer. It also helps with reducing surface fouling, which can have a massive effect on the heat transfer properties of aluminium, due to the build up of thermally-insulating oxides on the surface that can occur with plain water over time
