I have found that the air hole on my cobra is too small, just way too tight of a draw for me. Now since I don't have any other experience with RBAs I'm not sure how big I should make it. Any suggestions?
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Personally I think the draw on my Cobra is just perfect, I don't like airy draw.
But it's far from sucking a tennis ball through an hose.
Do what I've seen suggested in various Cobra threads, take something that fits into the air hole and poke through a few times, there can be some burr left from machining that blocks it.
But it's far from sucking a tennis ball through an hose.
Do what I've seen suggested in various Cobra threads, take something that fits into the air hole and poke through a few times, there can be some burr left from machining that blocks it.
i widened my cobra to 1.3 mm, and the widest air hole i experienced with was 1.5mm on mini-DID.
I've got one bored out to 1.2mm, and I think it's pretty much perfect. I don't care for the stock hole at all; I even find myself hyperventilating a bit when I chain-vape from my unbored Cobra. 1.2 works really well.
I bored my Cobra out to 1/16" (about 1.58mm) and it was perfect for me, but it may be too loose for you. I would also suggest snagging some tiny metric drill bits if you can find them and drilling it to 1.2mm before going any wider.
Again, keep in mind that I prefer very little resistance, it's something you can easily get used to. The clouds of vapor at ~1.5mm are excellent, but even 1.2(like a DID) is great as well.
Again, keep in mind that I prefer very little resistance, it's something you can easily get used to. The clouds of vapor at ~1.5mm are excellent, but even 1.2(like a DID) is great as well.
Do not touch the air hole on the Cobra....it has the perfect draw. All you have to do is insert a pin or a straightened out paper clip inside the hole and keep spinning it. Some of the Cobra's have obstructed air holes......and the above will fix the problem. I have tried many RBA's and the cobra is one of the best if not the best when it comes to flavor, wicking, vapor, and performance... so try not to touch the air hole.
Both of my Cobras had restricted air holes when I got them. I used a set of welding torch tip cleaners on them, to clean them out; and both work great with the factory sized holes.
The important part of this post is in your opinion. While yes, first the OP should make sure the air hole is unobstructed and then try it out, but it still may not be to their liking. Mine wasn't obstructed at all but I still ended up boring it out a slight bit after a week or two of using it stock and I preferred it that way. Though a lot of people like a tighter draw, many of us prefer a more airy draw. My Kayfun, for example, has an adjustable airflow. You can tighten the screw in or out to open it up or almost completely close it, and I prefer it with the screw almost all the way out most of the time, though sometimes I do close it off more.
It's all a matter of preference, though I do DEFINITELY agree that the OP should check to make sure it isn't partially closed up from machining before modding it. Keep in mind that once you drill it out you can't undrill it. But you can always give it time and go to open it up a tad bit later on.
I have made sure that the air hole is not obstructed and I removed the fill hole screw. But thank you all for your opinions! It is much appreciated!
Well of course it is my opinion....but anyone getting the Cobra should make sure the hole is not obstructed and they should vape on it for at least a week or two before deciding to bore it out. Once you bore it out....it will be like another device.
Agreed. I've had three different Cobras at this point, and I made sure they were all unobstructed (and, in fact, they all had the same draw), and it's just too tight for me. Maybe it's the way I draw, but I find the stock hole to just be too much work for too little vapor. Bored out to 1.2 I was very happy.
Then again, I love my ZAP, which has an air hole the size of the Lincoln Tunnel.
Ofcourse some people like airier draws....but the obstructed airflow on the Cobras is very common. Most of my Gennys have much larger air holes than the Cobra....The draw on the Cobra is a little harder than my other RBAs but it produces clouds of vapor with little effort. If it vapes like you are sucking a golf ball through a hose and produces little vapor however hard you try....there is some obstruction. The obstruction might not be visible (mine wasn't) but with a dental pick or pin or something you should be able to open the air hole....brushing the inside with a steel brush should follow. Residual manufacturing oils might be forming a film on the air holefrom the inside of the cap, so washing the top cap out with soap might not be a bad idea. I would try all these steps before boring out the air hole.
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