OBS Engine Mini Review by Dan Willis

Review Date: 

OBS Engine Mini

The OBS Engine Mini is a 23mm width rebuildable tank atomizer that features a 3.5ml tank capacity and is designed to stay cool under high wattage usage. It also features a side filling design, to make topping your OBS Engine Mini up with juice easy.

It is also a top airflow tank, with an airflow control ring that is intended to make adjusting the airflow easy, and a two post Velocity styled build deck is also included with the OBS Engine Mini. It's also manufactured from 304 stainless steel, with a Pyrex glass tank section.


  • 23mm width
  • 54.5mm height
  • 40g weight
  • Manufactured from 304 Stainless Steel
  • Pyrex glass tank section
  • Self winding evaporator
  • Available in black and silver finishes
  • 3.5ml capacity
  • PEEK Insulators
  • POM wide bore drip tip
  • Top airflow control
  • Side filling design
  • Two post Velocity styled dual coil build deck
  • Designed to stay cool under constant use
  • 510 threaded

What's in the Box?

Inside the OBS Engine Mini kit you'll find the OBS Engine Mini RTA itself, a screwdriver, spare Pyrex glass tank, a pack of organic cotton, spare post screws, spare o-rings and two pre built twisted stainless steel coils.

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Design and build quality

Constructed from 304 Stainless Steel with a Pyrex glass tank section, the OBS Engine Mini sports solid build quality. It has a 23mm diameter and measures 54.5mm from the 510 connector to the drip tip, with smooth edges and nice clean threading, a widebore POM drip tip is located at the top of the OBS Engine Mini, and it is available in your choice of black or silver finishes. I received the silver finish for review and in my opinion, it’s actually a very nice looking little tank, that hasn’t looked out of place with any mod that I have used it on.

OBS have included a side refilling system, present on many of their previous tanks, whereby you refill the tank by lifting up the fill ring with the OBS logo to expose the filling port, and fill your juice from their. It makes refilling the 3.5ml tank section quick and easy. The 3.5ml capacity is actually on the large side for a ‘mini’ rebuildable tank atomiser, with many mini RTA’s having a capacity in the region of 2-2.5ml.

At the base of the tank you have knurling present around the edges, which allows you to remove the deck easily by aiding your grip around the base of the deck, and this also means that you can access the deck when you have a full tank of juice, you just need to ensure you close off the airflow fully before doing so. Engravings are present on the base of the deck too, as well as a fixed gold plated 510 connection.


Designed to be as leakproof as possible, the OBS Engine Mini sports adjustable top airflow, with two reasonably sized airflow intakes located just under the drip tip fitting. An airflow control ring allows you to smoothly adjust the airflow settings, and from experience once you have set your airflow in place it tends to stay where it is. Airflow is funnelled down from the top airflow slots to your build, helping the OBS Engine Mini stay cool under high wattage use.

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Building the OBS Engine Mini

The OBS Engine Mini features a two post Velocity styled build deck, with ample room to build. The deck is accessed by unscrewing the base from the tank section, and it pops out easily. You can also access the build deck to make adjustments even with a full tank of juice too. You’ll notice that there are four wicking holes in total, once you have fitted and placed your coils you just need to ensure you have an ample amount of wick in these holes. You don’t need to go overboard with the wick, you just need to ensure the holes are covered.

The post holes are a little on the small side, so you won’t fit massive coils in here, however you can get coils up to around 3mm in diameter to fit just fine. The two supplied twisted stainless steel coils that come included in the spares back came out at 0.18ohm, and these are actually intended for use in temperature control mode, in my opinion this is where you will get the best performance from these coils. Overall, the OBS Engine Mini shouldn’t give you too many headaches when it comes to building.


I started off by using the supplied twisted stainless steel coils, and used these in temperature control mode on my Vapedroid C1D2, with a 250C temperature limit and the power set to 45W. I got a lovely warm and smooth vape, with a fairly dense amount of vapour, and it wasn’t too thirsty on the 3.5ml tank capacity. I did also test these in wattage mode, as stainless steel can be used in both wattage and temperature control modes, however the vape I got in wattage mode from the stainless steel coils was fairly harsh and made the OBS Engine Mini heat up extremely quickly.

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Next off, I tried a dual clapton coil build, using the SS316/Kanthal A1 26/32awg UD Pre Built Specialty Coils, to try the tank out in wattage mode. I began by using it at 45W, and steadily increased the wattage up to 60W. I did find that the OBS Engine Mini still gave off great flavour, however the vape itself was much warmer and the tank did get pretty hot with repeated usage.

All in all, I actually came to the conclusion that the OBS Engine Mini performs very well in both standard wattage mode, and in temperature control mode with the supplied twisted stainless steel coils. A big plus point is that it wicks extremely well too, not being troubled by any juice ratio that I tried out. I did think that the stainless steel coils in temperature control had a slight edge in the flavour department, I felt that I got a cooler and slightly more flavoursome vape from these, and the OBS Engine Mini tank itself does get hot when used in standard wattage mode.


I’m not normally a particularly big fan of temperature control these days, however the OBS Engine Mini made me enjoy vaping in temperature control all over again! The flavour I got from this tank has been marvellous, and I really did feel that this performed better with the supplied twisted stainless steel coils in temperature control mode, it’s not often these days that I feel that a tank performs better in temperature control than wattage mode.

Whether you are a temperature control fan or not, the OBS Engine Mini is definitely worth the small investment, as it’s a great flavour RTA that is very well made and easy to build, available at a bargain price. With its top airflow design it’s virtually leakproof as well, and a tank I wouldn’t hesitate to recommend!


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 Dan Willis
Article by Dan Willis
Dan was an early adopter of vaping as a way to quit smoking and has seen and done pretty much all there is to see and do in the vaping world! From Ego batteries to mechs and from rebuildables to pods there isn't much that Dan hasn't tried.
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