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

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

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

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!

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

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

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 😊

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

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

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

Great explanation without all the BS good job👍

Best explanation of this on the web!

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

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

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

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.

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?

Excellent vid

Great explain sir

Nice details.

Very helpful!

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.

📽️ *Great video* 👍

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

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.😎

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.

Hello sir, what about those hole sizes?

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 🙏

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

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

Thanks!!

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

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?

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

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?

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

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

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

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.

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

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 .

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

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

Emulsification tube🤔😂😂😂😂

not thorough enough