Cure Dry Hits From Your Bottom Coil Tank (BCC)

ismoka-bcc-1Bottom coil Tanks are really better for keeping a wick wet but at times, you still can get dry hits from them.  There are many reasons why including the thickness of your juice, wick size and vaping voltage.  There have been many suggestions I’ve seen but none seem to work as well as what I’m going to lay out for you and it’s really, really simple.

You see, there is a design flaw in every single bottom coil tank that no company or person has addressed.  What makes me so smart?  I own a bunch of bottom coil tanks from many different companies and all exhibit the same issues, dry hits every now and then.  I set out to figure out why.  After studying the design of the BCCs, it became obvious.  Pure physics.  Liquid physics to be exact.

Here is the issue.  As you draw on the mouth piece of a bottom coil atomizer (BCC for short), you are sucking out the juice from the tank basically into the atomizer wick holes.  As you deplete the juice in the tank, you are creating a vacuum above the liquid.  The more liquid you use up, the more vacuum you create in the tank above the juice.  This vacuum wants to keep the juice in the tank and not let it go out through the atomizer wick holes.  What happens next, a dry drag into your throat.

Tank designers should have thought about this.  Gas cans have a second hole to allow air in to replace the vacuum.  They are now even telling you to put a second hole in a can of beer to make it pour better.  The same physics happen with your ecig tank.

You can’t just drill a hole in the top of the tank to let air in. Your juice will leak out if tipped.  What I do is very simple.  Just unscrew your BCC tank from your battery, turn it upside down like you are going to fill it.  Unscrew the bottom to let some air in then screw it back.  Put it back on your battery and you are ready to go.  No dry hits for a while.  It’s that simple.  Vaccuum is relieved and you are ready to vape for another round without dry hits.

I’m not sure why the tank designers are ignoring this but letting air into the top of the tank while your juice gets depleted should be part of the ismoka-bcc-2deisgn.  This also goes for carto tanks as well.  Clearomizers with a top wick suffer from other issues other than this issue and have thier own.

Just letting air into the tank to relieve the vaccuum will keep you a happy vapor for a long time to come until someone designs a one way air valve into our tanks.

Note – If you still are getting dry hits from your BCC tank after letting air in, you may have other issues like too much voltage for the atty ohms you are using.  Use a coil with higher ohms.  Also, your juice may be too think for the wick in your tank.  This happens a lot and you may need to remove a strand or two from the atty silica wick by pulling a strand out with tweezers.   The vaccuum relief method works for me every time though :) .



19 thoughts on “Cure Dry Hits From Your Bottom Coil Tank (BCC)

  1. Thank you for the great info, Mr. Puck! I appreciate your helpful posts and still enjoy the puck I built. Thanks again for your valuable time!

  2. I just learned this trick today. :)

    I already knew a vacuum built up in the tank, but I was trying to relieve it by unscrewing the top, but found it wasn’t working very reliably. Then I tried unscrewing the bottom. The first time I unscrewed way too far, and immediately lost a good amount of fluid, but I later found if you unscrew it a little ways, just enough that you can tell air is getting in, then immediately screw it shut, it works like a charm.

    Just a tip for others with the issue, and thanks for the great articles Puck! The puck mod is a wondrous design!

  3. Thank you being new to vaping I thought something was wrong with my unit or I was doing something wrong. My T3S is now working better, thanks again!

  4. Four weeks of research to fathom the lingo & equipment used in vaping. Settled on eGos with BDCs. First week went okay: smoking & vaping. Second week making my own juices and things going great smoking much less and vaping more. Third week the taste has all gone to pot – I thought it was due to my taste-buds being restored after 40 years of pipe smoking? Nope, it was the BDCs and multiple coil changes made no difference: I was still getting dry acrid hits…

    The [b]vacuum problem makes perfect sense[/b], especially with the smaller EVOD/Kanger Mini2 atomisers…or clearmisers or whatever the bloody things are called.

  5. I just blow into my tip to restore the air in my tank. Gotta be careful not to blow too much though, as it will shove too much juice into your wick and you’ll get it in your mouth on the next hit.

    • Yes, I do that too occasionally but you have to be careful because sometimes you blow juice down into your battery from the bottom contact hole so I use that technique sparingly.

  6. That is a genius idea. Hadnt thought of that bein the issue.thanks greatly. simply crackin the tank immediately worked wonders. I just gotta crack it once in a while

  7. I have to do the same thing in my FIN BCCs but instead I crack the drip tip and I can see tiny bubbles come up through the juice.

    These are a great deal right now, I got 4 prefilled clearos, 2.4ml @ Walgreens for $12.49. (2 two pack, buy 1 get 1 free)

    They are sold as disposable but they are not. Just have to break the tiny bit of rubber cement they put on the drip tip threads and then refill. I haven’t figured out how to get to the coil yet, clever spring loaded design – doesn’t just unscrew…

    These so much better than top coils – no burnt taste and I can finally enjoy the flavors. They’re a bit of a tight draw so I am going to fiddle with airflow and build a puck mod to get more power than my 650mah ego battery!

  8. So ironic to read this today. for the longest time I’ve been having this problem with multiple tanks, mostly kangar. It was just this week using my mini pro I noticed every time I would flip it upside down I’d see air bubbles and then I realized what was happening. I will say the simply rocking motion has been working for me without having to unscrew anything.

    • With the protanks, both the regular and the mini, I have never had to crack the seal on the tank either. Flipping it as you said seems to do the trick. Also I noticed a quick few draws on it without pushing the vape button helps also with these. Draws liquid into the chamber without atomizing it allowing the wick to soak up fluid. Thanks for letting us know what works for you. I’m sure everyone has had the problem at one time or another.

  9. I Unscrewed the screw at the top where I fill my tank (smok rsbt hybrid) and it fixed the issue, ive been coughing for 2 days. Thanks you, you are a bliddy genius, sometimes it’s the simple things you just never think of.

  10. Thank you SO much! Letting air in cured my problem of the dry hits! I unscrewed it, and held it to my fan for a few seconds. I will do this now when I get dry hits again! Wow! the difference is amazing and excellent when you let a good stream of air in. I recommend using a fan- if not enough air is your problem (even a cheap travel fan for £1.00).

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