BIG, BIG note – I have a clone R91% (said to be a “2014 model” whatever that means, off of eBay), thus I have no idea what similar clones on the market or original units (Kayfuns, other Russians) share this one’s main deck, but as you can see above, mine has VERY roomy juice channels. They’re about 2mm deep on the bottom and about 1-1.5mm deep inside the chimney. I’ve seen some picture where the channels are shallow, but that should NOT prevent you from pulling this build off.
I highly recommend a VV/VW battery with built-in ohm check feature to make everything much, much faster.
And so, you simply measure out enough mesh to,
- be long enough to go from bottom of the chimney/chimney’s channels all the way over and across the coil area and into the other channel.
- be thick enough to fill your channel tightly, unless your channel is very shallow, in which case you can just run it towards it and not inside.
Prepare it however you like, roll, test fit. If all of that goes well, find a drill bit the closest size to your rolled mesh and wrap a coil of your choice around it. I did 30 gauge nichrome to 1.4 ohms.
Set the coil, lift it above the air hole, etc. Pull the mesh through the coil, try to have it fit snug but not too tight nor too loose.
Pinch and bend enough of the SS mesh roll to reach desired area around one juice channel, then do the same on the other side. Trim excess with scissors.
Screw the chimney bit on and start testing ohms and doing quick test firing (preferable on the lowest wattage possible) to find the hot spots. Adjust the coil around using anything fine and pointy until you work all the hot spots out and it glows evenly EVERY time you fire it. Don’t be afraid to shift the mesh a bit to help kink out the hot spots.
Put enough juice to saturate the wick and wet fire it to see how much the ohms drop when its wet. You’re looking for .1-.2 drop tops. (Note that this build does not like to be part-dry, so that could be the sole source of any discrepancies, but it never hurts to make sure.) If its more, carefully burn it until its dry and test for dry hot spots again.
If all is well and consistent, build everything back up and do a few final dry burns to make sure it still works when assembled. Looking into the chimney will let you see if the coil heats up fine + checking the ohms.
Fill, set your wattage, and enjoy. I like mine best at 6-8 with PG and 7-9 on VG.
Final note – check your ohms periodically to make sure it’s all running as it should. If it suddenly start to drop .3 or more ohms, I would suggest draining, and checking the coil even if it still tastes about the same. No reason to let a good coil pop from a hot spot when you run low and don’t notice it.
Credit: skv012a
Source: http://skvltd.wordpress.com/2014/03/26/vaping-russain-91-rba-clone-ss-mesh-build/
Kayfun/ Russian 91% SS Mesh Cotton Coil Guide
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