Carburetor Emulsion Tube Explained - How it works - What they do?

* VISUALLY EXPLAINED
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In this video I explain about the structure and function of the 4-stroke carburetor emulsion tube and how it work. As you will see in the video, it basically works by adding air to the neat liquid gasoline fuel as it rises up the main jet (a special area known as the Emulsion Tube) on its way into the venturi of the carburetor.
This mix of air and fuel within this area is referred to as emulsified fuel, which basically means the fuel has been separated with air thus making it more lean (less neat).
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#CarburetorExplained
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[@stewcrane3441]

Passing to my offspring. I could not have explained it more simply. You are the Professor.

[@RobbiRocks]

Thank you, this is a rather complex part of the fuel flow and it's been explained well. Also a huge thanks for having No annoying back ground music

[@howdaay]

This was EXACTLY what I have been seeking. Very straight-forward, with illustrations and concise. Thank you!

[@TheRepairSpecialist]

You're very welcome!

[@michaelbrinks8089]

​@@TheRepairSpecialistQuestion- Dellorto phbg 19mm 2 stroke carbs have an emulsion tube called an atomizer with no holes.....The 4 stroke carbs have the same emulsion/atomizer tube buy it has holes. The no hole tube is 2 stroke only & won't run right on a 4 stroke. But the atomizer with holes works for both 2 & 4 strokes. So will a 2 stoke also run better with holes in the tube. Or run better with no holes? I suspect the 2 stroke will need a bigger main jet if using a atomizer/emulsion tube with holes. Since the engine is getting more air mixed into the gasoline?

[@robertasjasas4851]

Very useful! It’s been a few months since I started learning repairing stuff like this from my father. These videos help me to understand everything better. Thank you!

[@muugmuug4501]

BIG thank you for this VERY good video. No stupid music, not a word too much, amazing images. The genius is in the simplicity.

[@TheRepairSpecialist]

Wow, thank you! I really appreciate your kind feedback. Craig 👍👍👍

[@dennymcelhaney8652]

Straight to the point and very good job explaining it! 👍

[@arthurfricchione8119]

Wat a great video. I never heard it explained and I don’t recall anyone talking about it or explaining it. Thanks for sharing your knowledge and videos. Artie 😊

[@californiagonecountry7057]

Thanks for the videos! You have taught me so much. Keep it coming.

[@Rev-D1963]

That is a nice little basic premise video. Well done mate, and thank you for sharing.

[@bbarott]

Best explanation of this on the web!

[@TheRepairSpecialist]

Thank you so much. Craig

[@wakefieldyorkshire]

I never new this, thanks for the information very useful.

[@paradiselost9946]

i made the comment on the other video about the old school air compensation valve. thats the other half of what these do... regulate the suction on the main jet with the air mass passing through the venturi, to deliver a "constant" mixture regardless of air mass. the air inlet, air jet, forms a pitot with a certain ratio to the overall throat, so that sets the pressure variation. fuel, in the bowl and the chamber around the tube is under atmospheric pressure, whereas the chamber itself is under the pressure of the pitot tube. which is directly proportional to the velocity and the ratio of bore sizes. the spacing and number of holes alters the amount of air fuel for any specific RPM as that pressure ratio alters. fuel gets pushed down lower and lower against atmospheric pressure, and uncovers successive holes, leaning the mixture out progressively. ideally... at any throttle setting, the RPM may vary through a wide range, and the suction on the jet as the air mass alters will also alter. you also find a lot of the idle circuits have their own miniature emulsion tubes, performing exactly the same function but in miniature as its using the air that bypasses the slide. the "idle air" intake tube is basically a very very small carb strapped to the side... the CV carb is another layer of trickery with its self regulating slide and needle to deal with... arrrgh! put four in a rack and then its just a whole new level of hair pulling :) i dont ever want to deal with a six... 12? !!!!!! as i mentioned... a brake dyno, a "prony brake" type... you can keep a fixed RPM, and vary the throttle. this just deals with the actual jet sizes. the inertial type (or prony with a bit of unloading, which is better as you can bog it down as well!) will register the variations in mixture as the throttle stays constant but the RPM alters. and thats all about that emulsion tube and air jet. seat of the pants or plug chops dont always tell the whole story and its a big part of why it can be a nightmare sometimes. the stumbles and flat spots that you cant seem to get rid of... changing the wrong part! remember, no carb chart mentions emulsion tubes. got all these little overlapping parts, but they all only relate to throttle position, or slide cutaways, or needles... not air velocity.

[@TheRepairSpecialist]

Thank you for sharing your extensive knowledge and insights on the old school air compensation valve and its role in regulating the suction on the main jet. Your detailed explanation of the mechanics behind it, such as the pressure variation and the impact on the air-fuel mixture, is truly enlightening. It's evident that you have a deep understanding of the complexities involved in carburetion systems, particularly in the context of CV carbs and the challenges they present. Your mention of dealing with multiple carburetors and the intricacies of tuning them adds another layer of complexity to the equation. Your point about the limitations of seat-of-the-pants testing and plug chops in diagnosing carburetor issues is well taken. It's clear that you've delved deep into the nuances of carburetor tuning, and your insights are valuable for those seeking a better understanding of these systems. Your passion for this subject shines through, and it's evident that you've gained a wealth of practical experience in this field. Thank you for taking the time to share your expertise. Craig

[@troymurphy6471]

Great explanation without all the BS good job👍

[@TheRepairSpecialist]

I really appreciate your awesome feedback. Thanks. Craig 👍👍

[@hphillips7425]

Good video and good illustration. Also to the point 👍🏻. Have a good one from west Tennessee

[@liaison66]

Thanks, very enlightening. This was the first video of yours I have watched. I immediately subscribed.

[@TheRepairSpecialist]

Thank you so much for your nice feedback. It's comments like yours that motivate me to continue making these videos. Craig 😀👍

[@harshasamarasinghe7257]

Great explain sir

[@yoyomamamma2260]

Excellent vid

[@nickl1682]

Nice details.

[@mupcountry7153]

Very helpful!

[@davekennedy52]

always see these little holes and always clean them, but never knew their purpose. Until now, so thanks for the video

[@johnsilva7140]

Same here! Isn't it cool to know?

[@MartyInTheWoods]

📽️ *Great video* 👍

[@wakjob961]

How do you choose which E-tube is the best for your carburetor/engine combination? Is this where a narrow band gauge comes in handy?

[@marcosgomesdefaria9860]

Thanks!!

[@pcallah3442]

Guess I shouldn't ask about the science behind the size, amount of and location of the holes on the tube. I've been hoping for years that the handful of Weber DCOE tubes I have would talk to me but they refuse...enjoyed the video, good job.

[@TheHarryMann]

See below… emulsion tubes are really a mixture weakening device as revs and load increase. The atomisation effect was fortunate but in fact, incidental to mixture correction

[@michaelbrinks8089]

​@@TheHarryMannThat what I suspected. Dellorto phbg carbs have a 2 & 4 stroke design. The 2 stroke carbs use no holes in the tube & won't work on a 4 stroke. The 4 stroke carbs use holes in the tube & can work on both 2 & 4 stroke. So the majority now come with holes. I suspected if I bought the carb for my 2 stroke. That I'd need bigger main jet since the emulsion tube is adding more air & less fuel. But I suspect it's better to use an #AN tube with holes & add bigger jet since it'll mix the gasoline/air better than a #AU that uses no holes.

[@theekshanakusal9165]

Hello sir, what about those hole sizes?

[@michaelgonzales7655]

Are there some emulsion tube that are plastic on a toro recycler?

[@priobe]

What’s the name of the book, that he talks about in the video or where can the entire video be found? This a great video, Thank you.

[@killswitch_disengage]

If I understood correctly, theoretically, the more holes in the emulsion tube, the leaner the mix? Also, where in the throttle position does this effect have the most effect? Thanks 🙏

[@TheRepairSpecialist]

Yes, you are absolutely correct. The emulsion tube in a carburetor plays a crucial role in mixing air and fuel for combustion. The number and size of holes in the emulsion tube determine the fuel-to-air ratio. If there are more holes in the emulsion tube, it allows more air to mix with the fuel, resulting in a leaner fuel mixture. Conversely, fewer holes would create a richer fuel mixture. Adjusting the emulsion tube is one way to fine-tune the air-to-fuel ratio in a carburetor. Thanks Craig

[@killswitch_disengage]

@@TheRepairSpecialist Great, that answers my question 👍

[@michaelbrinks8089]

​@@TheRepairSpecialistDellorto uses different emulsion tube sizes also along with holes.

[@kusheen...]

So are more holes in the emulsion tube better? The stock one has 8 holes, but there is an "upgrade" with 30 holes.

[@Grahams-Grass]

Are we still doing the why the plastic Briggs carbureter are so pants video ??? 😊👍👍👍🦆

[@promechanics2395]

Does jet needle and emulsification tube is same ?2.when piston sucks air does air is sucked from main jet as well as from emulsification tube at the same time or not?

[@michaelbrinks8089]

My main jet is on the bottom of the emulsion tube. So gas is being pulled in/up through it from the bowl. While air is also being sucked into the emulsion tube through the holes. So the gas & air is getting mixed together on it's way up the tube. Then sucked into the main carburetor hole & sprayed into the intake manifold. 2 stroke guys say a roughed up intake helps fuel atomization. But I think that's for a carb with no emulsion holes. On a carb that has holes in the tube. The gas is well mixed, so a polished for better flow is probably better. Since gas is already well mixed.

[@richardrichard5409]

The explanation is totally incorrect....although many, whom don't understand carburetor operation often make this mistake for some reason. Emulsion tubes are there to lean off the air fuel ratio as air velocity goes up with engine speed. Why? Because....the air flow increases but, the mass of air doesn't increase directly in proportion....so the main jet is 'keeping up' with air flow not air mass, hence the air fuel ratio will become too rich without the emulsion tube. The reason there are holes at various heights is because as the air flow increases, the fuel level in the capacity well (where the emulsion tube sits) decreases, thereby exposing more emulsion tube air holes thus, leaning the main jet fuel with air flow. Think of the fuel coming out of the main jet been pre diluted like a soda syphon.😎

[@bonnjoemaroleocabrera1397]

Very helpful! By the way, i have very specific questions about emulsion tubes of my PZ27. How can I contact you outside KZbin? Thank you very much!

[@TheRepairSpecialist]

Thank you for your feedback I really appreciate it. I haven't yet made any provisions for contact outside KZbin because making these videos is the only line of work i am concentrating on outside of my regular repair job. Thanks. Craig 👍

[@michaelbrinks8089]

Dellorto phbg 19mm carbs have an emulsion tube called an atomizer jet. The #AU jet/tube has no holes in it & says it's for 2 stroke engines only & doesn't work with 4 strokes. While the #AN tube has holes in it & says it's for 4 strokes but will also work with 2 strokes. My question is, will the AN with holes work better on 2 strokes than the no hole AU? I kinda think maybe, Dellorto made a 2 stroke carburetor first. With no holes in the tube, then later added holes realizing it mixes the air & fuel better. Like if the original 2 stroke design was running like crap on a 4 stroke. Then they figured out the holes fixed the issue. Or will a 2 stroke actually run better with the AU no hole emulsion tube/atomizer?

[@joshuaharrison9331]

So the air fuel mixture screw on 2T engines works only to regulate air for the pilot circuit, not the main circuit.

[@TheRepairSpecialist]

Thank you for your nice feedback I really appreciate it. Craig 👍

[@jpatt5825]

My idle emulsion tube was damaged on the screw head. Would this stop it from working properly 😊

[@TheRepairSpecialist]

It may do depending on how badly damaged it is. Providing the ready of the carb and engine are ok Maybe worth replacing to at least eliminate possible issues.

[@gregtarasinski5516]

Emulsion tube makes air and fuel mix Emulsifier is used when 2 ingredients do not mix naturally Same as emulsifier in food, 2 ingredients cannot combine without it The emulsion tube is trying it's best to turn a liquid into a gas by atomising the fuel into tiny droplets, the tinier the better which equals more surface area of the fuel 1000 tiny bubbles has a lot more surface area than the same amount in 1 bubble.

[@chezsou1987]

What if I add more side holes? Will it improve the emulsification?

[@TheRepairSpecialist]

Maybe but I have never done this and don’t really know the exact outcome. Craig

[@TheHarryMann]

The main effect wasn’t explained, that of gradual weakening of the mixture at the top end, so yes it will change things, it’s how some fine tuning can be done, by tapering rounding the bottom of the tube or very minute changes to the holes

[@maxagent86]

Do 2-stroke carburetors also have a emulsification tube? Thank you for the great video(s).

[@devilsoffspring5519]

I doubt they need it since on a 2-stroke, the fuel/air mixture gets inhaled into the crankcase and sloshed about, thoroughly mixing the two. Small 2-stroke engines have diaphragm carburetors (instead of a float bowl) and the ones I've seen do not have emulsifiers.

[@michaelbrinks8089]

​@@devilsoffspring5519I seen a 2 stroke will run with or without holes in the tube. But a 4 stroke needs holes. This makes me think it's best to use holes on a 2 stroke and just use a bigger main jet if needed. This means the air & gas will be mixed better than a no hole tube & won't need to rely on the crankcase to further mix it. But......being less mixed will probably provide better lubrication. If I order a better carb with holes in the tube. I might try 35:1 oil mix instead of 40:1

[@johncunningham4820]

Technically , Air is also a Fluid , though Gaseous . Emulsion tube specifications is a " Black Art " . Always was . Let alone these days with MPI or Direct Injection .

[@TheHarryMann]

It’s an emulsion tube, not a flipping emulsification tube. It may do emulsification but why rename it pointless !

[@callum2108]

Really good video but air is a liquid if you don’t believe me you’re wrong look at aerodynamics on the internet it’s a liquid but good video

[@TheRepairSpecialist]

I certainly don't disbelieve you because the physics of this reality is a very dynamic and mysterious thing indeed. Thank you for your feedback I really appreciate it. Craig 👍

[@TheRepairSpecialist]

I certainly don't disbelieve you because the physics of this reality is a very dynamic and mysterious thing indeed. Thank you for your feedback I really appreciate it. Craig 👍

[@richardrichard5409]

Emulsification tube🤔😂😂😂😂

[@mikem5475]

not thorough enough