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Review Of OBS Engine II RTA

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OBS Engine II Introduction

The OBS Engine II, made by OBSNSMOKE, is a 26mm-diameter dual-coil RTA with a 5ml-liquid capacity tank.

It’s an upgraded version of the OBS Engine Nano RTA, preserving its top airflow-inlet system (for solving leakage problems, usual in RTAs with a bottom airflow ring) and its top-refilling system while providing an entirely new deck of a unique design. It is available in 4 colours.

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OBS Engine II Specs & Features

Height: 56mm (including driptip)

Tank’s Diameter: 26mm (base’s diameter: 25mm)

Liquid Capacity: 5ml

Type: Dual Coil RTA

Drip tip: 510

Material: Food grade 304 steel

Thread: 510

Weight: 42gr


Dual-coil RTA with 360o top adjustable airflow control (no leakage), but with bottom coils’ air-feeding deck.

Patented top/side refilling system.

Precise design of air circulation system.

Easy two-posts build deck.

High quality 304 Stainless Steel construction.


OBS Engine II RTAIncludes:

Engine II RTA

Spare glass tube

Bag of cotton pads

Bag of spare orings and two pre-wrapped fused-Clapton coils included

Philips-headed screwdriver

A user manual

Design & Usability

The OBS Engine II RTA consists of four parts (bottom to top):


A base with a uniquely designed dual-coil deck with the coils hanging down from the post’s screws (large Philips-headed ones).

A glass-tube tank (held in place with orings on both of its sides).

A single metal part enclosing:

The freely-rotating cylindrical double-walled “bell” (domed inside). Between its two walls, the air is guided from the airflow ring’s holes down to the deck. Resulting in the construction of two “bells”, one inside the other: a smaller internal dome (vaporization’s chamber bell) & a larger external.

The single-hole liquid replenishment system of the tank.

The 360o adjustable airflow control ring (with 3 airflow holes).

A wide-bore (at its upper part only) 510 resin driptip.

Below the 510 resin driptip (with two orings), at the upper part of the top cap, there is an airflow adjustment ring. It’s a 360o easily-rotating one (without a stopper), but firmly maintaining its adjustment setting.

OBS Engine II RTAThe incoming air (from the 3 airflow ring’s holes) circumferentially descend around the internal “bell” down to the deck’s two opposite-positioned air-entries, hitting the two coils underneath. Then, covering the coils’ cylindrical surface, the air continues in reverse direction, to the vertical path upwards through the smaller vaporization chamber’s domed “bell” to the drip tip.


The screwable/unscrewable base hosts a uniquely designed deck for a dual-coil build. The coils are set-up (upside down) hanging down from the posts’ screws for positioning the coils as close as possible over the bottom air-outputs of the deck.


Design & Usability Continued

This design allows the air to hit the coils vertically upwards, “hugging” them, before continuing its course upwards inside the domed vaporization-chamber “bell” to the driptip. Until you get used to its particular setup, don’t cut the coils’ leads right after you screw them (not very tightly at first) to the posts, to be able to rearrange the coils positioning right above the deck’s air-outputs, pull the coils away from the posts and down to the air holes.


It’s a uniquely innovative design. The incoming air from the three input-holes of the airflow ring is first distributed circumferentially around the outer-surface of the internal “bell” (lowering its pressure) as it descends down to the bottom of the deck. Then, the air is compressed while entering the deck’s two opposite-positioned air-inlet holes, located under the two coils, increasing the airspeed while pounding the coils from below.

What Does The Design Mean?

The result is the widely recognized flavourful vapour, usually with bottom air-feeding systems. The only thing that needs attention is the fitting alignment (locking) of the external “bell” to the base, since you have to line them up properly (before screwing the base back to the rest of the tank), so the locating bars at the bottom of the external “bell” need to match the locating notches at the periphery of the deck.

At the lower part of the top cap, just below the airflow ring, there is a metal “refilling ring” (carrying the “OBS” logo), covering the liquid’s replenishment single-hole underneath it (revealed when popped-up). A small triangular mark on the bottom of the top cap declares the location of the hole under the “refilling ring” (when in slide-down position), to know exactly where it is (for easily finding it when you wish to refill the tank).

The refilling ring easily slides up and down, but it is also tightly fitted (for not leaking at all). The replenishment single-hole is spacious enough (for inserting any usual type of bottle’s nozzle) and the refilling is easy by slightly tilting the tank.

OBS Engine II RTAThe double-wall “bell” is surrounded by the glass-tube, providing a 5ml-liquid capacity to the tank.

More On Design & Usability

The OBS Engine II RTA measures 25mm-diameter at its base, but then it bottles-out to reach its maximum 26mm-diameter at the height of the tank’s glass-tube. This allows it to be mounted on mods that take up to 25mm-diameter atomizers with no overhang at their top. But, if there is a protruding battery-cap on the mod’s top-base, it might prevent the screwing of the atomizers on the mod’s 510-pole connector.

After you set up the coils and bring them close enough over the deck’s air-outputs, the wicking needs a little attention. It must be fluffy and cut almost to the length of the outer periphery atomizer’s base (i.e. short) for the wick’s tails to not reach the bottom of the tank’s well when inserted inside the four wicks’ ports of the deck. This is how many of its users prefer to set their build-up to get a better wick’s liquid saturation result.


However, if you tightly stuff enough amount of cotton inside the coils, then no wick fluffing is actually needed. But, do cut the wick’s tails long enough to reach down to the bottom of the base’s well. In this case, the capillary action (Bernoulli Effect) is significant and there would be no problem with the wick’s adequate liquid saturation constantly. Besides, with the wick’s tails touching down to the bottom of the base’s well, it will drain the last drop of liquid left in it.


The OBS Engine II RTA is a good quality-build atomizer. The impeccable and exemplary operation of all its parts is easily noticeable when using it. Its 5ml-liquid capacity makes it more practical. The RTA is easily replenished and airflow adjusted.

The airflow adjustment can provide you with an airy vaping experience down to a tight one.

OBS Engine II RTA ReviewThe total outcome of its airflow system design easily ranks the OBS Engine II among the silent atomizers of the sub-Ohm category, with one of the smoothest puffs provided. The resulting flavour is remarkable also due to the double-coil design of the deck, which produces a substantial amount of dense vapour. This means an increased liquid consumption, usual on dual-coil sub-Ohm RTAs.

Performance Continued

The dual-coil build with the included pre-wrapped coils attained a total of 0.2Ω. Powering it down to 60W produced a cool dense vapour that didn’t let the atomizer’s drip tip get hot at all.

From the whole design, the atomizer’s vapour leans towards flavour integration. Not flavour intensity (usually attained with more air-intake and higher wattage). But, it does provide flavour analysis, attained with less air-intake and lower wattage. This is due to its unique bottom air-feeding design, along with the top-domed vaporization chamber bell. You only need to lower the coils enough, over the deck’s bottom air holes. This will also tighten your draw more than enough for a respectable tight MTL vaping style.

Note: If you like tight MTL puffs, don’t build coils with less than 3mm-outer diameter. Don’t use coil-pivots smaller than 2.5mm diameter too. This is because their outer cylindrical surface won’t be enough to cover the size of the deck’s air holes, when you push the coils down enough over the deck’s air holes.


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