I will attach a pic to show you what I'm talking about, but basically, the coils are supposed to heat at the same rate, and from the center of the coil outward. Check and check. But my situation is, obviously the coil is maybe heating up too much in the middle because even tho my wicking is still juiced, and the outer parts of the coils are still wet, the middle of my coils become dry much faster. Is there a way or technique I could use to spread my heat more evenly throughout the coil? It was a pain to get them to heat at the same rate to begin with, but I'm going on a trip next week so I figured I'd rebuild all my rdas that I'm going to take with me anyway, and this is one of them. Its a dual coil 24g parallel at .13 ohm. Any help would be greatly appreciated BC I don't want to burn the middle of my wicking. I think maybe its due to the wicking? Maybe its too thick. Just and idea.
so, I have a coil question
- Thread starter j0nj0n3s
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This kind of build is pretty intolerant of any kind of wicking issue. It looks to me like you've simply got too much wick; if you were running rayon, it would be great, but not with cotton. Have you considered a build that's not so "hot"? Because at .13, any ohm reader you're using is simply not accurate enough to give you a correct reading. It works out to a 32 amp draw on the battery too.
Too much wattage for your rda. You either need to increase wicking/airflow, or decrease wattage.
Your coils already look pretty large from the pic so a larger diameter coil might not be plausible.
The thicker gauge wire you use, ramp time gets longer. When you hit your button the coil begins to heat up. A 24g coil probably takes close to 2 full seconds to hit proper temperature. As it keeps heating the wick will start to scotch. The longer it takes a coil to ramp, the longer it takes a coil to cool. So after you let go of the button, the coil remains above the wicks temp threshold for a few more seconds. Think of having a pizza in the oven and turning the oven off when it's done. If you leave the pizza in there it will burn because the oven retains the heat from when it was on.
I'd do that same build with 26g to reduce wattage/ramp time.
Your coils already look pretty large from the pic so a larger diameter coil might not be plausible.
The thicker gauge wire you use, ramp time gets longer. When you hit your button the coil begins to heat up. A 24g coil probably takes close to 2 full seconds to hit proper temperature. As it keeps heating the wick will start to scotch. The longer it takes a coil to ramp, the longer it takes a coil to cool. So after you let go of the button, the coil remains above the wicks temp threshold for a few more seconds. Think of having a pizza in the oven and turning the oven off when it's done. If you leave the pizza in there it will burn because the oven retains the heat from when it was on.
I'd do that same build with 26g to reduce wattage/ramp time.
Its on a Tesla invader so dual 18650 Samsung 25r. The steam engine calculator says my amp limit is 44a and I still have 27% headroom. I've got lots of other builds, but I love these clouds and the vapor is still pretty cool, my batteries barely show any sign of warmth, even after all day usage with a lot of back to back hits at night with relatively constant usuage. I wicked it so thickly bc the other day I didn't wick it thick enough and it continued to pop after I let off the button and then flamed up for a second. But I'm sure I can find a happy medium. I kinda figured that might be the issue was the coil was choking the cotton. I will try thinner and see how it works out and update that progress later today. Thanks for the reply/input and for your concern on battery safety 
I may actually try it with 26g. I'd have to buy some tho. All I have at the moment is 24 and 28. This was my first attempt at a parallel coil. I just wanted to see how it went. It actually heats up really really quickly. And doesn't seem to retain the heat as long as one might think. But I completely get what you guys are saying and thanks for the responses. And as far as airflow, I've got it on halfway for more dense clouds, I could open it farther if it would really help I guess. I just liked this air/vapor ratio a lil better. And the holes are directly on the coils. Doge v2/v4
So... I put some thinner wicking in the coils, and it seems to have really helped. The coils seem to be drying out at and evenly distributed pace. It make me feel a lot better about it. Thanks for you guys input. I just needed confirmation. And I'm def going to pick up some 26g and try it again as well.
I may just do that. I just hate trying to twist 28 BC it breaks 90% of the time and makes me mad lol. It even breaks when I'm just trying to straighten it. But I'll def update you guys when I do the rebuild. I figure I'll probably even get a little more flavor that way too. I love twisted 28, I just hate the headache of twisting it with the giant drill I have
Did you glow your coils With no wick in them after you built them and tested them ?
Did they glow evenly from the inside out ?
If not and they are both even and the same then get them to glow and then scrape along the outside of each coil with the end of a flat screw driver. It breaks an oxidation layer and helps them to glow more evenly. Glow coils - let go of fire button then scrape along coils.
Once all is glowing evenly from inside out then any wick drying discrepancies most likely a wicking issue.
Did they glow evenly from the inside out ?
If not and they are both even and the same then get them to glow and then scrape along the outside of each coil with the end of a flat screw driver. It breaks an oxidation layer and helps them to glow more evenly. Glow coils - let go of fire button then scrape along coils.
Once all is glowing evenly from inside out then any wick drying discrepancies most likely a wicking issue.
I had to dry fire it a million times trying to get them to heat up evenly lol. And then every time I rewick it I dry fire it and readjusted them. I swapped out my wick this morning for a lil bit thinner wick and it is performing perfectly now. I almost don't even want to rebuild it, but we're going on a cruise and will be gone for a week and I really don't want to rebuild it on the boat (my wife doesn't want me to either lol). I changed it this morning and most recently checked it again about 20 min ago and the whole coil(s) are drying evenly. And I always wondered how running a screwdriver tip across the coils helped to fix hotspots. And now I know, so thank you for that. I knew the trick, but didn't know the science behind it lol.
Sometimes a build just doesn't work. If a build just doesn't want to co-operate, I just rip it out and make the coils again. Wire is cheap.
Been there before. The day I got my 2 hole Kennedy clone I built it 6 or 7 times before I had a build I actually liked. I've got so many coils in my hardware box from where I'd build something, hit it a few times, then tear it down and do something else. Luckily for me, I love building
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