Thanks for the responses!
Originally Posted by GilaMinumBeer
Are you setting up the cooler the same as you do when mashing? Meaning adding a hose to the outlet or whatever you have.
Maybe it's the difference between hot water and cold (grasping here) and the heat is opening teh braid.
Deadspace is the liquid left behind when the tun is drained. So, you are approaching it right. You just have a phenomenon at play.
You did open the valve, right?
I edited my OP to reflect this, thanks!
Originally Posted by beerthirty
Remove the braid, fill to above the valve and let it drain. then measure whats left in the cooler. Or don't remove the braid and fill it fuller, let the water weight start the flow. When the flow stops measure whats left in the cooler. (double check your braid and diptube for any possible restrictions)
I'll try filling it fuller to see if the water weight forces the flow, that'd clear up my curiosity about whether or not weight forces the fluid through the braid and uphill to the valve. I'm not sure if this will give me an accurate number though as with the grains in there there'd be considerably more weight pushing down than with water alone. I like the removing the braid, filling above the outlet and letting it drain idea, I'll give that a shot.