Holy kamoli on airflow and the rm2 ! Wow ! Airflow airflow airflow !!!!

[flexsr]

So currently i have two grandes and two rm2s.

When first got the rm2 couple months ago it was great. My first time rebuilding - so had some pride in the build, plus all the hype on rebuilding in general had me loving this thing.

So Some time goes by and im like ehhh - its ok - doesnt blow my 306 or good carto out of water on reo (306- just a coil anyways)

Little more time goes by and I stupidity got sucked up to cloud chasing on one of my rm2s drilled airhole out slightly -- its been a horrible vape ever since....I got lazy on ordering a new top cap.

Long and behold another memeber (zmauls) showed me some pics of jerry rigged copper ring that you can drill different size holes in and have your own jerry rig airflow control.

Well let me say this, i drilled one hole tonight, tiny hole (as i like my vapor dense n warm and mouth to lung hits) and. WOW completely changed my vape to what i like !!!

3 points to this post that 90 post know but heres for the 10 percent

1. Rm2 is a great rba- ceramic bottom - how can ya go wrong
2. I cant get over how much airflow effects the vape - the slightest difference in airflow makes a huge difference to the vape (at least for me) so if you own a reo and rm2 and after the initial excitement are underwhelmed - wait for robs airflow control system (i believe he's building one, no?--- if hes not i feel like an ...)

3. Airflow is as important or more important than the build IMHO. I think with a so so build and proper airflow for YOUR liking along with Your favorite juice you will be amazed !

I personally didn't realize the importance of how a small difference in airhole size can play such a huge difference in vape. And thanks to member who helped me jerry rig mine till i can take a peak at robs system.

Do you cyclone owners with airflow control agree ?

 

[c3 rolling]

I totally agree. I drill out all my RDA's to about an 1.5 mm air hole. Works for lung or mouth hits. I find anything less wayyy too tight which negatively affects vapor production and flavor.

 

[Papa_Lazarou]

I can attest to the airflow affecting the vape thing. I drilled one of my RM2 caps to go for a little more extreme lung hit thingy, and hoo mama, did it ever make a difference. The juice I had in it to test it was a fail on my part, but once I refilled the little beauty with an appropriate nic level and pg/vg mix it was bombs away (in a kinder, gentler way than that sounds).

 

[JC Okie]

I agree. I think that of all the variables that affect a vape (position of coil, type of coil, type of wick, gauge of wire, etc) that the air may be the most important one.

 

[zmauls]

Glad you like the rig bud.

I like an airy vape, so both sides of my RM2 cap are drilled to 1/8". It took a lot of trial and error. I think I have 8 RM2 caps total. Granted, I run a 0.24Ω dual coil, so my vape is still a bit warm.

Let's see some pictures!

 

[flexsr]

Thanks zmauls. - damn tapatalk killing me with photos but pretty much just copied yours identical. If anyone wants to see pics ill throw them a link to the thread where you had pic n instructions up (until i can get to my computer). So many different vape preferences everyone has. Would be silly for any vendor going forward to not have built in ability to change airflow. I dont know all the physics involved in directional airflow. But just a change in size of airflow whether you want it bigger for some sick builds like zmauls or mistakenly drilled it out too much and want a smaller hole that is a warmer vape at .8 ohms the right airflow for YOU is your friend just like MR. Rodgers is.

 

[Ian444]

I've been thinking that the air hole size is a main factor controlling the vaping temp of the coil (the other one is the voltage across the coil). There must be an optimum coil temp for a given juice (and given user), and the air delivery helps limit or "regulate" or control the coil temp. For a higher power coil (lower ohms) its obvious to need a bigger air hole to keep the vape at the best temp for flavour and vapour production. Often we try a new coil, our latest and greatest, but it does not run at its best until the air hole is optimized for it.

There are problems arriving at the best size air hole, mostly that we have limited drill sizes on hand, ebay is good for lots of small drill sizes, metric sizes or number drill sizes. Also there is a trap, the area of the hole increases with the square of the radius, meaning, a hole of twice the diameter will flow 4 times the amount of air, not exactly what is sometimes intended. Say you have a 1/16" air hole, and you want 15% more airflow, you don't get a 15% bigger drill bit because that will flow around 32% more air. Someone (was it X-Puppy??) suggested using a diamond coated 3/32" tapered Dremel bit to make air holes bigger, sounds like a great idea to me.

Another issue I've found - the cheap Chinese rda's I've bought to play with seem to have air holes at different heights above the deck (within the same model). The problem can be that if the coil is too low to the deck, I feel there isn't enough air flow under the coil and vapour production and flavour suffers. It's like most of the bottom half of the coil isn't being used to best advantage. I like to have the coil at least 1/16" above the deck, I use the width of a 1/16" drill bit to check this.

For low sub-ohmers, something to be aware of is a 0.2 ohm coil will draw twice the power (in theory) as a 0.4 ohm coil, so control of exact ohms when winding coils in that territory is critical. At the other end of the scale, a 0.8 ohm coil draws twice the power of a 1.6 ohm coil, you can see 0.1 ohm here or there will not make so much difference in this higher ohms range.

These are just thoughts I've had, YMMV, hopefully food for thought if nothing else