Received my Ithaka pre-order this week and on my sixth or seventh build (kinda lost track...). I tried double silica coils (3mm and 3.5mm) in X-shape with and without an extra piece of wick in the middle at around 1-1.3 ohm total (twisted the non-resistance coils on). First attempts, very little vapor production and zero throat hit with Bounty Hunter / Gold mix at 24mg.
Now I tried pre-made coils (N+NR) with the same total ohm (1.-1.3 ohm), x-shaped without a center wick, improved vapor, better but not fully satisfactory throat hit, and unfortunately, it leaked half the liquid before stopping with Imeos' shake-it-on-a-paper towel method. Any tips on how I can improve the build?
Also, in all of my builds, the center pin is completely off the center - I tried fixing it multiple times before filling liquid, but it never worked. Am I doing something wrong or is there a possibility of a manufacturing fault of one of the components?
[
PS: At what voltage do you guys and gals change batteries on mechs - I know I shouldn't, and I don't go under 3.2v]
In addition to what RiverNut and Yiorgos have recommended, I would like to give my opinion:
Ensure ther are not any bur in the ceramic housing bottom hole, by where it enters he center pin: when I received one of my Ithakas, I made a dual coil setup, as the one you have made, the result was not good: poor vapor production and it was not hitting like it should. The problem was a little bur in the mentioned place.
By the second picture, it looks like the first coil / wick, is pushed down too much, a coil could be in contact with the center post top nut or the wick, causing the leaking and the poor performance.
After you finish the setup, try to evenly space the coils and you can pull up the wick / coils a little, in order they will not be too close to the center post top nut.
I have got the best results using 3mm wicks for both coils and adding a 1.5mm wick between both of the coils (like a ham in a sandwich), basic feeding opened for both channels and advanced feeding liquid control almost closed.
The off center center pin could be due a bur on the ceramic housing or due the NR wire turns around the (positive) center post, unassemble all the ceramic assembly and inspect it, also assemble it and try it without wicks / coils and check if it still off center, also you may want to leave the center post top nut is in closed position.
This Imeo's video could help as well:
My current setup is a dual coil (ribbon 3mm kanthal and nickel NR wire), each coil is 1.8 ohms for a final resistance of 0.9 ohms, flavor is great, vapor production is perfect.
I hope it helps.