The idea that one should not cover the vent with priming powder because of having to burn through the vent instead of flashing through seems equally flawed. While I did not try to fill the vent, covering the vent did not cause slower times. The closer I could get priming to the vent, the faster and more consistent the results. In fact the consistency I found in positioning the priming powder close to the vent occured at all vent positions – low, level, and high.
The last conclusion involves the reason for this whole experiment – proper location for the vent in relationship to the pan. I found that the location of the vent in relation to the pan is far more forgiving that we have believed. Tests when the vent was extremely low or high both gave quick reliable ignition. A look at the chart below shows that all vent positions gave fast ignition when primed close to the vent (This is what we learned in the preliminary tests.) Also all vent positions gave uniformly poor performance when the priming powder was banked away from the vent.
————————–Banked way—————-Level Prime—————-Close prime
Low Vent—————–.046—————————.037—————————-.038
Level Vent —————.043—————————- * —————————–.036
High Vent—————–.048—————————.043—————————-.037
*I did not time level priming when testing the level vent/pan position.
I began this series of test thinking that the big variable would be the vent location. However, I am now concluding that it is of minor concern compared to the location of the priming powder in the pan. I still like a vent level with the plan flat won’t loose sleep over a pan a little high or low.