Too little or too much cotton *Picture

[Guma]

rta - Russain 91%
VV/VW Semovar V3 @ 12Watts
Micro Coil 8 wraps @ 1.5 ohms
On long lung inhales I frequently get burnt taste at the end, so I am working on my wicking.

I think there is a picture attached....

 

[abrb701]

It might be because I'm a new member, but I can't see the pic. In my experience, if it happens at the end of a hit, its because juice flow is cut off from too much cotton, or the coil is too long and the juice can't get to the middle in time. That's just my experience though. It took me awhile to learn that I basically needed to use half the cotton I would have thought.

 

[DetraMental]

Does it go through the coil fairly easy? Without too much grab? If so I'd say you got it right.

 

[ElConquistador]

Looks pretty good to me!

 

[Guma]

Yea slides through butter smooth, no catching, no shoulders on the cotton. As I suspected my previous builds had too much cotton.

Thanks!

 

[Grimwald]

Looks good to me. My biggest problem with burnt (not wicking) taste comes when I refill. I just always try to fill it too full and then don't get the air pressure or vacuum (whatever) to get the liquid flowing thru the channels. I really have to restrain myself from pushing in those last few drops. Once I vape it down a bit, it's starts to work.

 

[DaveP]

If it slides back and forth with light drag you are right on the money. If it makes little wider hump on each side when you slide it back and forth that's OK, too. After that, I thread the large section of the chimney over the two wick ends and screw it down, then use scissors to trim off the excess above the chimney about 1/4" from the top of the chimney. You can stuff the wick down beside the deck at that point and prime it with juice. Push the legs of the wick over against the deck so that you can see the holes leading to the juice channel, reassemble and vape.

 

[Guma]

Grim, I did the same thing already today. Filled that baby as much as possible and couldn't build any pressure. Learning curve for sure, but having a blast today... a little frustrating, but its coming together.

 

[Shootist]

Well I disagree with those that say it looks good. To me it "LOOKS" like you haven't used enough cotton. Also your wattage could be slightly to high. With that build/wick try 8-10 watts, 3.4 to 3.9 volts, and see if you can take longer lung hits without getting a burnt taste.

 

[EverythingEvil]

Does it go through the coil fairly easy? Without too much grab? If so I'd say you got it right.

I'm not sure I really understand why I always hear that the wick shouldn't catch on its way through the coil. Every time I re wick my attys I make the wick as tight as possible, to the point where the wick almost won't pull through the coil. I have had more success with this method than making the wicks loose.

 

[Shootist]

I'm not sure I really understand why I always hear that the wick shouldn't catch on its way through the coil. Every time I re wick my attys I make the wick as tight as possible, to the point where the wick almost won't pull through the coil. I have had more success with this method than making the wicks loose.

Agree!

I have to twist the cotton slightly to get it in the coil. Once it is through the coil I un-twist it and then check if it slides.

 

[ImThatGuy]

You're getting a burnt taste because the cotton isn't getting re-wicked fast enough in comparison to your draw. At 12 watts with a 1.5ohm build you're at 4.2v. Not saying it's too hot for the build, but the cotton isn't re-wicking fast enough to compensate for your long draw. So, at the end of your draw the wick is dry causing a dry hit. Lessen the wattage to compensate for your long draws or find another wick. And it looks like...it's not enough cotton because I can clearly see through the other side.

 

[mazdajdavis]

Looks like it should be trimmed, lenth is only important when trying to reach down nn in top coils. Thickness and material is most important in bottom coil

 

[DetraMental]

Well there ya go, a 50/50 shot at who has the right answer. Good luck with your wicking. I stand by my statement about there being some grab while you thread the cotton through. You do want some but not to the point of it distorting your coil while you drag it through. I'd say try what you have and if it doesn't work go thicker.

 

[Newportlocal]

And if that doesn't work. I tried this nest method and haven't changed my wick in two days, and I have no burnt taste. Also, I am at higher wattage than I would have done before with no issues.
E-Cigarette Forum - crxess - Blogs

 

[emostorm7]

It might be because I'm a new member, but I can't see the pic. In my experience, if it happens at the end of a hit, its because juice flow is cut off from too much cotton, or the coil is too long and the juice can't get to the middle in time. That's just my experience though. It took me awhile to learn that I basically needed to use half the cotton I would have thought.

(in case you don't already know) the thickness looks good, but should only be about 3/4"-1"max, and should Not go in the juice channels. The reason your getting dry hits at the end, and your assumption is partly correct, is that the wick is dry by the end of the long inhale, and the cotton cannot wick quickly enough. I recomment trying a dripper. If your determined to stay with a RBA, than I would make the resistance slightly higher, and try rayon instead of cotton - more efficient

 

[Baditude]

Testing organic cotton, Chinese cotton, hemp, & rayon (cellucotton).

 

[DaveP]

I just watched the entire 45 minute video above. Phil's coverage, testing, and comments on the four different types of wicking material was informative. Who'da thought that organic cotton from Walgreens would come in last? Japanese cotton and rayon were the top two.

I'm happy with the organic cotton, but will probably try rayon at some point. I've not encountered dry wicking with OC up to 4.2v on a 1.5 ohm coil on the Kayfun, so it's not something that i worry about at this point. Still, it's nice to know how the different materials performed in a controlled testing environment. The wicking test done side by side showing infiltration into paper might have been the most telling.

Thanks Baditude, for posting this!

 

[jaxgator]

Looks good to me. My biggest problem with burnt (not wicking) taste comes when I refill. I just always try to fill it too full and then don't get the air pressure or vacuum (whatever) to get the liquid flowing thru the channels. I really have to restrain myself from pushing in those last few drops. Once I vape it down a bit, it's starts to work.

Grim, I did the same thing already today. Filled that baby as much as possible and couldn't build any pressure. Learning curve for sure, but having a blast today... a little frustrating, but its coming together.

Yup, overfilling will cause a sort of suction that won't allow the juice to flow into the channels properly. I use to fill my KFs almost all the way to the top and always ended up getting dry hits. I now fill it similar to this image...

Step 14: Fill the Kayfun nice and slowly until all you see is a small air pocket of space left, don't fill any further than this:

http://www.e-cigarette-forum.com/forum/tutorials/503153-kayfun-3-1-microcoil-cotton-guide.html

 

[Guma]

Ok so that particular build in the pic of the OP was NOT enough cotton. As some stated you could see through it, and I was gettting no wick. It was close to bed time so I packed it in for the day. I have watched a few vids of builds today and I think I am getting a better picture of how much to use. The length in that pic was prior to putting the chimney on and trimming to size.

At work now so the YouTube video that was posted is blocked, I will have to wait till I get home to watch that, but very interested to see the different qualities of each wicking material compared in the vid.

Thanks for all the help and advice, it will definitely help today when I get to sit back down to a build.