Hi all. I've been a member for a while now just reading and taking notes. I've come across a problem I can't seem to figure out. I did the usual analog look alike, step up to ego then went straight for the rba with a mech mod. Now I have switched to a box mod. I was using 28 and 26 gauge wire and recently started using 24 gauge which I like much better. Here is where the question comes in, no matter how I build my coils they work great for the first 3 or 4 days, then they seemed to burn too hot, no matter if I rewick or anything it tastes burnt. What am I doing here and what can I do besides rebuild every 5 days? My coils run around .2 to .4 with anything from 7 ro 10 wraps. And I use cotton with 70/30 mix. Any help would be great and thanks in advance.
Rba coil questions
- Thread starter csjdmj720
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- th_trl_thread_readers 0
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Though they may seem like they need little attention, rebuildable coils do have their quirks, tasting burnt or giving off harsh hits I'd start with this list (note assuming you are using Kanthal A1, if Nichrome just pulse easier and slower ie 1 second pulse 2 second cool to where they burn off crud then once that is done just start to glow, Kanthal you can get them cherry red or brighter in a dry burn, Titanium Grade 1 and Nickel Ni200 never dry burn)
1) Dry burn according to material, Kanthal you can pulse 5 seconds heat, 3 seconds or so cool each pulse until clean and glowing, Nichrome 60 and 80 1 second pulse to 2 seconds cool or 2 seconds pulse to 3 or 4 second cool, don't want it getting so hot it reaches distortion or melting point, then rinse the RDA under water and pulse the coils dry or gently dab them dry. Titanium and Ni200 Nickel you can try soaking in everclear, high proof unflavored vodka, or if available moonshine for about 20 minutes, then use a very, very, very soft toothbrush and gently scrub off as much gunk as you can, then rinse clean for rewicking.
2) Check your coil post screws, through heating expansion and cooling contraction screws will wiggle and work loose, this can affect resistance, can go either way higher in ohms or lower in ohms, in either case especially on a regulated variable power mod the chip could fire them hotter than they need to.
3) Before re-wick check for hot legs, hot spots, or if the coil is contacting a post other than at its two legs, hot spots and hot legs will burn hotter and give a scorched sensation
4) Rewick, recheck the resistance before firing, if you see a jump or decrease in initial resistance of .25 ohms or more, check for shorts, coils gain resistance over time, more you heat them over and over, the metal hardens and crystalizes, gradually increasing in resistance over time. Week one starts at 0.25ohms, 2 weeks later at 0.26 or 0.27, week 4 0.3 or 0.31ohms is normal resistance increase due to this crystalization.
hth a bit to look at, without the mod in front of me, physically I could check for other things, inspect things like a coil contacting the deck or top cap would be other places to check as well.
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