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

* VISUALLY EXPLAINED

These downloads are from my very own website and are absolutely Free. They consist of just a few help topics so far but I am continually making more of these Free Downloads.

Images within this uniquely explained video are Copyright protected to Craig Kirkman of The Repair Specialist (TRS) Channel.

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).

I hope this video helps you in some way.

Many thanks indeed

Craig Kirkman (Owner and creator of the Repair Specialist Channel and its copywrited content)

Please check out my amazon shop. I have recommended some useful items from Amazon below. I guarantee you that these items are the sorts of things I use on a daily basis so I know they are good. I have to be careful in recommending products because I have my name and credibility at stake.

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[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

[robertasjasas]

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!

[stewcrane]

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

[howdaay]

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

[muugmuug]

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

[arthurfricchione]

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 😊

[Rev-D]

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

[californiagonecountry]

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

[dennymcelhaney]

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

[liaison]

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

[wakefieldyorkshire]

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

[hphillips]

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

[troymurphy]

Great explanation without all the BS good job👍

[paradiselost]

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.

[wakjob]

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?

[pcallah]

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.

[davekennedy]

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

[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.

[theekshanakusal]

Hello sir, what about those hole sizes?

[Grahams-Grass]

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