Strange coil buliding issue

[cooperator]

So today I have officially rebuilt my first protank coil head-successfully! Mostly...

I used 6 wraps with 30 gauge kanthal and was aiming for 1.5 ohms. I wrapped around a 2mm mini screwdriver. Compressed, torched, mounted, and fired it up on my Sigelei. 1.5 ohms....Happy! I compressed the coils until I was happy with the glow I was getting, steady at 1.5. I added the cotton, which was kind of disastrous, but I wet it with e-juice and fired it up. Nice snap, crackle, pop and still 1.5. Happy! I added the chimney and grommet and fired again to make sure the head wasn't touching. Still 1.5. Thrilled at this point!

So grabbed my nearest tank, which was an evod (I was already building with the coil in an evod base), filled it up, assembled and fired. Nothing! Strange, I thought. The ohm reading was also now 2.5. I took the tank off and did nothing else, fired again and 1.5. Weird. I flipped the grommet and tried again. Same problem.

I didn't want to give up, so I went and grabbed my mini protank, which had different juice in it. Success! It fired like it should, tasted great, lots of flavor and vapor. I was thrilled, but I'm wondering why it wouldn't fire on the evod? I have watched so many videos and done so much reading before I even attempted this and I've never heard anyone mention anything similar. Any thoughts?

 

[DavidOck]

What are you using the check Ω? If it's a separate meter, then is sounds like the ego threaded Evod isn't screwing down quite far enough to make contact. 2.5Ω should still vape, even if it's not your target resistance.

And make sure you didn't overly compress the pin insulator on the head when you assembled, as that will affect the length and possibly the connection.

 

[Sthur]

Normally coils with change after firing, but not that much. I like 30 gauge around a 1/16 brill bit ( 1.5mm) with 6/7 wraps. Always 1.6 and never had an issue. Cotton only through the coil not on top for flavor wick. Keep grommet normal way.

Sounds like your on right track, need little tinkering.

 

[Jerrycat]

I've been doing the coils for my pt2 mini and my evods for a while and after reading your post, I remember this happening once to me with one of my evods.. what I did was over compress the backpin on the coil just a hair too much.. same result. Worked in my pt2 failed on my evod.. after repeated attempts, I figured I must have screwed in my evod onto the battery too tightly and backed it off abit. It started working but not well.. when I extracted the coil head the little silicon gasket was seriously squished flat, so I backed off the backpin enought to make the gasket look normal and reinstalled making sure the evod wasn't over tightened.. voila.. worked like a charm. Hope this helps!

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[e30holmes]

Yeah that's the same thing that happened to me the rubber grommet was getting squashed and pinching the leads and eventuallystarted touching each other causing somewhat of a short and inconsistent ohm readings

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[Tinkiegrrl]

Could be that when you screw the evod tank in, you're unscrewing the coil just a tad, and it isn't making the proper contact with battery pin? Try taking a pair of tweezers and pulling it down just a bit while the evod tank is on the base. Or, try not to tighten the tank on the base as hard. Just enough to be secure and not leaking.

 

[steved5600]

The insulator is probably compressed yes. You can go to Kindney puncher and buy an insulator used in i forget some Rebuildable. It is a bit better than the originals. I will also tell you if you want a better build with the pt heads you need to go buy NR-R-NR wire. The wire that comes on the original heads has no/low resistance silver wire welded to the ends so the leads to not get hot and burn that insulator so you don't vape burnt rubber. Discount vapors carries it as does Fasttech.

 

[CircaSurvives]

Pull the pin out just a tad. This has happened to me many times.

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[Despraci]

Here's a link to silicone isolators on eBay.
Resistance Coil Insulators Silicone or Rubber for CE Evod Type Atty'S | eBay

I preferred the silicone ones to rubber when I was rebuilding protanks.

 

[BigCatDaddy]

So today I have officially rebuilt my first protank coil head-successfully! Mostly...

I used 6 wraps with 30 gauge kanthal and was aiming for 1.5 ohms. I wrapped around a 2mm mini screwdriver. Compressed, torched, mounted, and fired it up on my Sigelei. 1.5 ohms....Happy! I compressed the coils until I was happy with the glow I was getting, steady at 1.5. I added the cotton, which was kind of disastrous, but I wet it with e-juice and fired it up. Nice snap, crackle, pop and still 1.5. Happy! I added the chimney and grommet and fired again to make sure the head wasn't touching. Still 1.5. Thrilled at this point!

So grabbed my nearest tank, which was an evod (I was already building with the coil in an evod base), filled it up, assembled and fired. Nothing! Strange, I thought. The ohm reading was also now 2.5. I took the tank off and did nothing else, fired again and 1.5. Weird. I flipped the grommet and tried again. Same problem.

I didn't want to give up, so I went and grabbed my mini protank, which had different juice in it. Success! It fired like it should, tasted great, lots of flavor and vapor. I was thrilled, but I'm wondering why it wouldn't fire on the evod? I have watched so many videos and done so much reading before I even attempted this and I've never heard anyone mention anything similar. Any thoughts?

My Sigelei 7-20 does the same exact thing sometimes. I have to fiddle with it, shut it off, restart it, switch toppers, switch batts and finally from a combination of differnt things, it will fire whatever atty I want. And all the time reading 2.5Ω with the offending topper. Weird!!!

 

[cooperator]

Thank you all for the tips and suggestions. I don't like using my evods anyway, but I thought I should know what I was doing wrong. I'll tinker with it tomorrow. Also, I was checking the ohms on my sigelei, which I just realized always reads 2.5 when there is a problem, so it wasn't a true 2.5. I had never had a problem, but remembered seeing that on a review of the sigelei 20w.