1925 DB Radiator Cap question
I have a 1924 DB roadster. Should the radiator cap seal tightly using a gasket, O ring or the like? I find that sealing the cap tight, pressurizes the system which is good for a system designed for that but I understand these cars did not use a pressurized system. So seal the cap tight or not?
I have found some! Yay! http://www.starship.org/Bugsby/Adventures/2009/Radiator-Flow2/Radiator-Flow2.php
One theory is that if the radiator is clear enough, the flow will be controlled by the size of the outlet at the bottom, in a non-pressurised system where the water flows through the radiator under gravity. Using Bernoulli's equation from the mid 18th century, one can derive an equation for the effective area (and thus diameter) of the outlet:
where V is the volume of water
