Kayfun Cotton Micro Coil Dry/Burnt Hits Solved with Different Coil Gauge

Discussion in 'Rebuildable Atomizer Systems' started by magicmyst, Apr 24, 2014.

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  1. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    Got my first KFL+ and R91 a couple weeks ago, and have been building 1.8Ω cotton wicked micro coils with 6 wraps of 30 gauge on a 3/32" drill bit. I've been plagued with random dry/burnt hits. Flavor would go from fabulous to less to nil, and I would get burnt hits out of the blue, powered by Provari at 3.7 to 3.9 volts. The flavor drop, after a few hits, could be solved by the occasional dry pull, and the burnt hits could be solved by a dry pull (sometimes with finger over air hole) to get more juice into the chamber.

    Since this clearly seemed to be a wicking issue, I tried every possible wicking configuration: less cotton, more cotton, medium cotton, longer wicks, shorter wicks, medium wicks, wicks on the channels, off the channels, on the side. Nothing worked.

    Recently my spool of 28 gauge kanthal arrived and yesterday I decided to see if it would make a difference. I've built 1.5Ω coils with 10 wraps on a 5/64" drill bit, and have not had a single. burnt or dry hit. Occasionally I will get a slight drop in flavor after a few chain hits, but it quickly recovers. This is a blessing, because the worst thing about those random burnt hits was that they'd come out of the blue- yuck. The only indicator would be that I'd hear a sort of "after-burn" sizzle after releasing the draw. FWIW, I'm using just enough fluffy cotton to easily pull through the coil without tugging. My wick ends go straight down to touch the deck and curl under a bit, without blocking the channels.

    So if any of you are using 6 wraps of 30G on a 3/32" bit and plagued with burnt hits and flavor issues, you might want to try the bigger 28G coil. I don't know why (more surface area?) but this has solved the problem and I'm a happy vaper :)

    I used to also have flavor issues after a re-fill (bottom or top) but haven't refilled yet with these new coils. I'll post back after refill if I have any problems.
     
  2. crxess

    crxess ECF Guru Verified Member ECF Veteran

    If it works for you, I'm happy you found your solution.

    All 5 of my Kayfuns are wicked with cotton and coiled with 30ga. some at 1.4ohm and some at 1.8 ohm.
    None ever give me dry/burnt hits.

    28ga. is my preference on all my drippers.
     
  3. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    Are your 30g micro coils?
     
  4. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    The new 28g coils seem to also have solved the refill issues. Just did the bottom refill with no flavor change!
     
  5. supersport13

    supersport13 Super Member ECF Veteran

    I've been getting dry/burnt hits as well and I am definitely going to try that build 2nite for my KFL+. Is your coil perpendicular to deck, or is it angled? Do u have a pic by chance? Thanks.
     
  6. kinggirl

    kinggirl Ultra Member Verified Member ECF Veteran

    I just got one last week. I did the navy nest as my first build which is basically kanthal on ekowool. Do any of you know if you get more vapor on the microcoil? I attempted to do a microcoil first but it took me forever so I took the shortcut way and did the navy nest. But, thinking now I just want to trash it when my tank is empty and do the microcoil but wondering how the vape is.
     
  7. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    Perpendicular. Sorry, no pics at this time. It's a classic micro coil build.
     
  8. crxess

    crxess ECF Guru Verified Member ECF Veteran

    Yes, I wrap around a 14ga needle
    Coil should have -0- to do with filling issues. It is not in the flow/fill area. Filling to full can cause issues. Vaping dry before filling can cause some issues. Vaping to soon after filling might cause issues.
    28ga can be a bit slower to heat up. This could change perspective. Especially for anyone that may take shorter draws.

    See my blog for my build
     
  9. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    My wraps were on a 3/32" drill bit- different than yours. Clearly builds do somehow affect performance after refilling. I ALWAYS had flavor issues after refilling (bottom or top) with the 30G build. Don't know why, but I did. The experience I've described here is accurate. Yours is a different experience with a different build. Congratulations.
     
  10. joecil

    joecil Super Member Verified Member ECF Veteran

    I've been using nothing but 28 ga coils on 3/32" raps from .8 to 1.9 ohms with not a single wicking problem including the one with the 4 channels instead of the duel channel as normal. I have 6 Kayfun clones by 4 different makers and 2 styles for one (Kayfun Lite+, 91% Black Russian). Love them all almost as much as my drippers.
     
  11. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    I'm going to try the 28G on 3/32". I just decided to try 5/64" since it's a popular size for 28G. Have you used 28G on 5/64"? If so, how do the 2 compare? That should be a nice big coil on 3/32".
     
  12. crxess

    crxess ECF Guru Verified Member ECF Veteran

    Correct, mine are 2.1mm while yours was 2.3mm.
    However, I must stress - the coil is NOT in the fill path and can only vaporize received e-liquid. If you are getting Dry hits the coil is NOT receiving e-liquid regardless of its size.

    Are you experiencing this on Both the Kayfun and the R91?
     
  13. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    Well, you can stress all you want, but the fact is that the problems with flavor after a refill on both the KFL+ and R91 are no more with the new build. Just because you can't explain something doesn't mean it's not so. Somehow the physics have changed and all is working fine, and that's good enough for me.
     
  14. vapdivrr

    vapdivrr Vaping Master Verified Member ECF Veteran

    Supporting member
    going from 6 wraps of 30g to 10 wraps of 28g is imo, a needed move. in micro coils 6 wraps is kind of low especially for a thin wire like 30g. 10 wraps gives you much more wick coverage and along with a thicker wire makes a world of difference. the heat produced by only 6 wraps of 30g is scalding compared to the 10 wraps of 28 where the wire hits the wick. now the heat your producing is so much more spread out with the 28g and your not drying out your wick. so yes your move to 28g has made your vape a lot better but in a sense its really not the wire but just the way you made your coil with the 30g. if you took that 30g and made lets say a 14 wrap with it(although the resistance would be too high) I bet your vape would not react like your 6 wrap of 30 did.
     
  15. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    /\ Makes sense to me.
     
  16. vapdivrr

    vapdivrr Vaping Master Verified Member ECF Veteran

    Supporting member
    besides being a better wire, better flavor, its a lot easier to work with imo.
     
  17. magicmyst

    magicmyst Super Member Verified Member ECF Veteran

    /\ Yep. Except sometimes getting under the posts. Ever try 28G on a 3/32" bit? Maybe 9 wraps for 1.5 ohms.
     
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