TD 049/051 cylinder; double or single booster is better?

My tach testing on the bench when I was redoing 4 TeeDees did not specifically measure just the cylinder change because I was trying to see if the so called high performance cranks added anything to the game...they do not.... biggest power adder was the tweaking of the Venturi diameter

That said, one of the three engines was a used .051 and one with a used factory TeeDee .049 cly ---and two were with the Bernies .049 "teeDee" version with the slits cut open and new pistons. I did a two fuel cycle run on each engine as a base line for that engine and all were some where in the 21,990~22,850 range

I don't remember the exact RPMs but I do remember both of the Bernies versions were 500~900 rpm faster than my two older used sets and thought at the time that what I read and you just noted was the configuration must add swirl and better fuel delivery or burn

One interesting to me note was the .051 was always down 500+ rpm vs the other three and I was using a Paul Gibeault provided CYL/PC set

All were run with the Galbreath Head and Nelson plug

I did a computer change since then and the data from the testing in buried on one of my backup drives

Would love to own a good small engine dyno to see more about torque and thrust vs RPM

One other note ...while I did use same type and sized props I did not use ONE prop for each test so variances there may have crept into my non scientific testing

Bottom line is-- a lot of words to say I tend to think that Bernie's configuration is a power adder but don't really have empirical testing proof