You Will Understand How a Carburetor Works After This Video

This door kept slamming shut by itself whenever we tried to air the place out. We got a door stopper, but I realized that the layout of the apartment is the same as that of a carburetor and the reason behind the moving of the door is the same as behind the moving of the fuel in a carburetor.
Both the carburetor and the apartment feature large open spaces which are connected by a narrow passage between them. This narrow passage results in an increased air velocity and an increase in air velocity results in a decrease in air pressure. A decrease in air pressure leads to atmospheric air pressure working for us and pushing the fuel into the engine and moving doors in an apartment in ghost-like fashion.
The atmosphere in which we live has an air pressure (1 bar or 14.5 psi) because all the air above us has a mass. This mass pushes down on us and creates pressure. Pressure is higher at sea level because there is more air mass above as at sea level than at the top of a mountain.
If we manage to reduce air pressure at any point then atmospheric air pressure will push things towards the point of low pressure. Air always moves from high to low pressure because air aims to equalize pressure everywhere.
Now we can reduce air pressure at a desired point by increasing air velocity at that point. A narrow passage between two large spaces is a great and simple way to increase air velocity at the passage because the narrowing space acts as a constriction or bottleneck and so air builds behind this constriction and pushes air or another fluid through the narrow passage with greater velocity. You have probably experienced this yourself if you ever blocked off half a garden hose with your thumb to increase the velocity of the water coming out the hose.
Now increased air velocity results in reduced air pressure because the fast moving air molecules they bump away the still-standing air, they disperse it or reduce it's concentration if you will. This why doors in a draft will often slam shut by themselves. Air velocity increases across the front of the door so air pressure reduces on the front of the door but atmospheric air pressure remains behind the door. This pushes the door and moves it into a position where the air drag can grab it and slam it shut.
The same thing happens to the fuel inside the carburetor. One side of the fuel is exposed to atmospheric air pressure but the other side of the fuel is exposed to reduced air pressure that occurs due to the increased air velocity in the narrow section in the middle of the carburetor. This is how atmospheric air pressure managed to push the fuel up through the tube that leads to the fuel hole in the narrow passage. The fuel slightly protrudes above the level of the hole and then the air drag grabs it and takes it into the engine.
But this does raise an important question. If we rely on the throttle slide or butterfly to provide air flow through the carburetor how do we get fuel into the engine when there is no airflow i.e. the throttle slide is released and the engine idles? We do this by leveraging the power of the vacuum generated by the engine and using the idle air bypass. The throttle slide acts like a barrier between the atmosphere and the engine internals. The downward motion of the pistons generates a vacuum and when the throttle slide is released it prevents the atmosphere from entering the engine so the vacuum or the pressure difference between the inside and the outside of the engine remains. In reality we perceive this vacuum as air being sucked into the engine and when the throttle slide is released and the engine idles - vacuum is strong. So the engine can suck in air through the idle air bypass. But as soon as the throttle slide is raised atmosphere enters, vacuum weakens and so the task of fueling the engine gets transferred from the pilot jet and the idle air bypass to the main jet.
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#d4a
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[@d4a]

Clean your carb: amzn.to/3sc31Vf Ultrasonic: amzn.to/3sc31Vf DIY powerhouse: amzn.to/3sc31Vf Patreon: www.patreon.com/d4a

[@szymoniak75]

im gonna walk around my house now and explain to my wife how it's an analogy for an internal combustion engine

[@d4a]

I just know she's going to love that

[@josecarlospoggian149]

😜😜

[@waldolemmer]

​@@d4aI also know this guy's wife

[@cucoelmalefico7087]

Good luck

[@ianthepelican2709]

Well you'd better not get the part about variable valve timing wrong or your camshaft is in for some trouble. 🤣🤣🤣

[@DerKropa]

Bro woke up, noticed the draught air flow through his flat, and was like "yep, this is my moment to explain how carburetors work". Amazing work, as always.

[@GrimReaping]

I have learned more about engines from you in the last year than I have by working on engines for the past 10 years. I knew generally how things worked and the mechanical part of it, but you have such a great way of explaining the physics of it all. Thank you for making these videos, man.

[@d4a]

Thank you so much for the kind words

[@eTiMaGo]

Such a complicated explanation for a simple answer: ghosts

[@d4a]

Trying to hide the truth with science! I'm waiting for someone to comment how they can see strings pulling the door 😂

[@cat81702]

I always knew that ghosts actually operate carburetors

[@SpeedFreak0122]

I have never seen/heard a clearer explanation of how a carburettor works than this. Thank you!

[@AnthonyCelata]

Only a true gear head would see this happening in his home and immediately think... Carburetor!

[@samc343]

i went from thinking he went crazy to now being able to pass an auxiliary engine systems parts exam

[@brewmental]

You really do have a terrific ability to develope an idea. A one sided discussion with a camera, but somehow make me feel included. A great analogy this time too. Thank you!

[@WolfmanDude]

I just finished your "iconic engine" playlist and loved every second! Maybe you could do a video series on the most terrible engines ever made? It would be sooo interesting to see what went wrong on a in-depth technical level! Your calm, factual and neutral video style would be perfect for this, analyzing if the hate for each engine is really justified.

[@19LG99]

this is one of the best explainations of the venturi effect i have ever seen

[@camilosalcedo7341]

Min 3:00 I had a big 🤦‍♂️-moment. 7 years of combined studies (automotive mechanic, mechanical engineering) and wouldn't have been able to conceptualize Atmospheric Pressure in simpler words than these. Keep it up, Mr. D4A.

[@spikeprotien9023]

You are the top GenZ explainer. It is so painful to watch some of your young comrades trying to deal with carbs & distributors.

[@d4a]

I'm 35 years old

[@markm0000]

@@d4a for boomers everyone that’s younger is the same generation. I don’t get it either.

[@Low760]

I know plenty of boomers who don't understand carbs too.

[@joshuagibson2520]

I'm a gen x, but always called \ considered a boomer by young folks.

[@rezkidgamingyt4725]

I really like how you beak things down to make it easier for people to understand the basics of how things work Awsome love your content brother

[@JoaoZagoSJC]

Wow. Nice. Now every slam on my house's doors will be understood as combustion stroke! Got it. Love it.

[@YusufGinnah]

That's it! *Holley* is officially 'The Best House Name' from now on! 😎👍🏼 *EDIT:Ok guys, you can call it Edelbrock if it's a boy house..*

[@d4a]

🤣🤣

[@brianbrigg57]

How about Carter?

[@CDeuce152]

​@@brianbrigg57Carter's assets was picked up by Edelbrock.

[@brianbrigg57]

@@CDeuce152 Still a better boy's name. If you want esoteric you could go with Webber or Stromberg, if your house is Asian style you could use Mikuni or Keihin.

[@photohounds]

Physics is fun. A knowledge of it is useful in many ways, including ; . To understand/make useful things . To contradict people without such knowledge, who claim to be quoting "experts". Consider weather fools, and this is known as a Logical Fallacy : the "appeal to authority" Fallacy. Great to hear someone who understands and clearly explains a subject. You sir, are such a man.

[@yuriibubis574]

This guy has some amazing ability to entertain with educational videos Huge thanks for your work my brother!

[@OutsideTheTargetDemographic]

For KZbin : My apartment is an internal combustion engine analog For his wife : And this is PROOF for why I AM NOT THE ONE THAT SLAMS THE HALLWAY DOOR SHUT!!!!

[@borismatesin]

Thank you for demonstrating the workings of a carburator at such high risk to your life. It is well known that promaja (a local name for a draft going through the house) causes death, joint pain, neck cricks and the common cold.

[@markrc2012]

You are so good at explaining these concepts in a simple and easily compressible manner... Awesome video (again)

[@m80tmm]

What a soothing voice you have ❤

[@BTFWayne]

Good stuff. I would love to see a videos on heat dissipation.

[@michakasprzak6869]

Officially the best house tour on youtube

[@OShihadeh]

I am to adjust the carburetor of my motorcycle, so I am glad to see this video today

[@szymoniak75]

damn its really impressive how some smart people came up with this. Also, great job on explaining, it's very clear. BTW, your demonstration would be even better if you used some visible gas to show the air flow in the carburetor

[@photohounds]

There are several CLEAR carburettor videos online, so you can see the process in real time. Worth a search.

[@CMDRSweeper]

I think we can safely say that it wasn't just one smart man inventing this from scratch. Basically it has all happened in increments with small steps, the next was one step to improve, suddenly you have a carb that works. I bet the first part was just a manually controlled fuel leak / leaking hose.

[@user-de8bu5es6f]

It's way outside the box, but every word and every aspect, every analogy are very true. I guess it's a bit like seatbelt and crash helmet laws, only the converted / educated really appreciate the intracasies of it all. You have raised 1 point though. The importance of lamina flow through carb design. As your hall door (throtle slide) was closing, we know the low pressure fast moving air would be tearing itself away from the flat surface of the door and causing vauticies. We can't allow such vauticies on a carb. So keeping the carb air passages /surfaces clean or polished is important. We can learn from this, that a dirty carb facilitates better low end power because of a greater turbulence vs a shiney clean carb producing greater top end power due to greater volumetric efficiency.

[@ronchang9791]

Wow, that's amazing 😅. When I was working at a pizza place, I once described to a coworker how a bypass shock on a trophy truck worked by sending employees to the front register and opening/closing the side door to let someone get there externally 😂.

[@OutsideTheTargetDemographic]

I like to beleive this is how D4A argues with his wife. "You keep slamming the door stop" is answered by a 13min, detailed, researched, physics-based rebuttal on how she is wrong. Lololol 🤓🍻

[@d4a]

But do you know who's actually wrong in the end?

[@OutsideTheTargetDemographic]

@@d4a Not you. You have a science-based presentation. 🤓👍That doesn't mean you won't be sleeping on the couch...

[@MajorFleshbang]

Outstanding answer to a question I didn't even knew I had 👏

[@LyvTube]

I've never studied mechanics in school or with professionals but i've always wondered how the hell all those pieces of technology work, and you systematicaly deliver clear and visual, tangible answers to those questions so well and in a way everybody, at least with a little bit of will, can understand them. I don't say i'll remember them for ever but at least, you nail it every time, no matter the subject .... thanks so much for the energy and time you put in your explanations to teach us things !!!! 🙏🙏🙏🙏

[@SouthernMNTV]

This has to be the best carburetor explanation video ever.

[@Wren6858]

Please do an engine analysis on the gm 3800 v6. Thanks for the videos!

[@rob5944]

Like most other people of a certain age I remember having car troubles with carburettors quite often. In fact the store where I worked used to sell conversion kits for manual chokes. Since the advent of fuel injection in mass produced cars became widespread I've personally never had a single issue with fuel delivery. No more having to adjust this and that and fiddling around upon cold start-up's, more economy and power with lower emissions. It's all good as far as I'm concerned, thanks for the video though!

[@ScrewBlower]

Maybe it is not vacuum, maybe its poltergeist🤣. Jokes aside, to be honest now i know thanks to you why there are holes in carburator thanks!!! Can you do some videos about lubricants or materials used in engine? Thanks!

[@pirojfmifhghek566]

Came here with a good idea of how a carburetor works, but left finally learning what the heck the "choke" was for. Outside of a small gas lawn mower engine, I'd never had to think about the choke before. I'm just gonna keep binging your videos, because there seems to be a lot that I don't know and even worse--there's a lot I don't know that I don't know.

[@c.a.r.s.carsandrelevantspecs]

Fantastic video! I can confidently say that this is the most helpful and informative video about the principles of carburetors that I've ever seen! Excellent work! 👍

[@padders1068]

Thank you Sir! Extremely well explained and at a level everyone can understand! Thanks for sharing!

[@split150]

I didn’t have a chance to watch this video yet, but wanted to say your full chat with Andre of High Performance Academy was excellent. Many of the viewers would probably enjoy if they weren’t already aware of it.

[@leanspo]

That's why I use a rubber stopper in my corridor door 🤣 Great video as usual 👌 Now I understand better my carburetor

[@catalinilie306]

You have a gift mister.

[@johncampbell3029]

This channel is excellent- accessible and thoughtful explanations, using everyday life to aid understanding and diagrams that really help. Thank you for educating me.

[@tommyrocker33]

Thank you so much for the excellent video, I knew the rough idea of it but this was such a good explanation and filled in many holes that I was unaware of. Really appreciate it, cheers!

[@akinozkan4496]

Man, thanks a lot. I learned a lot about engines. I’m telling you this as an mechanical engineer. Respect!

[@Ramsi-Berlin]

I love your videos so much ❣️👌🏼😊 Thanks for all 🙏🏼 Love to Sarajevo from Berlin, Ramsi 🙋🏻‍♂️

[@ifixem9585]

Dude, a collab with Engineering Explained would be amazing. I think he needs your help, he's very dorky, but you're both nerdy. Nerds are cool.

[@ramadhanisme7]

Grew up in an injection with ecu era, the idea of carburetor is always a complicated matters to me

[@jadendubose4066]

He is not crazy. The door is in fact fuel. I understand carburetors perfectly after this video.

[@Roukos_Rks]

theres no need to say this is a great explaination

[@RenanFuji]

amazing analogy. now i understand more about carburetors and home design 😂 brilliant video as always 🎉

[@phillipfritz7014]

It's impressing how people can come up with these rather simple but amazing design and make them work thanks for your explanation

[@olspanner]

Well done, as usual, brilliantly explained. You are a Master Interpreter of Mechanics.

[@aksharma4393]

Keep it up Bro.

[@emirsalimi893]

İt is really good and well explanation of Bernoulli's volume ...... In our school they be come explain it very hard and......

[@johannriedlberger4390]

Amazing to see that today's kids still know what a carburetor is.

[@just.jose.youtube]

Awesome video!

[@jozsefizsak]

Fascinating.

[@augustinep6193]

Good. Thanks.

[@Zuranamee]

Just commenting to say this is the most unhinged video title out of context - fantastic work

[@gregholloway2656]

Great explanation, d4a! Perhaps a followup would be an explanation of efi, and how numerous sensors and a computer allows the precise amount of fuel needed to be known. Also how efi can compensate for elevation change, but a carburetor cannot.

[@ritemasterful]

You saved at least 1 old car with this video

[@Laliberty]

I feel like when you learned this about the apartment it influenced your decision to buy haha

[@johndoe70770]

The discovery of this analogy is equivalent of gamers seeing health bars on top of people walking by or seeing how tetris players look at buildings and stacking them together

[@d4a]

🤣🤣

[@terjejohnsen3651]

That was very good expaned.

[@banpeinet]

And I thought I knew perfectly well how a carburetor worked, but this explanation just blew my mind! 🤯 And I didn't realize you had a family and kids! Again I was wrong there, unless those toys are actually yours! 😂

[@Mayank_Maximum]

You are the motivation for me to from making exterior of cars to engines Weird

[@shizusensei4942]

it happened. he has gone crazy jokes aside very effective example

[@blackpete]

You're just insane 😂 wonderful analogy.

[@1one3_Racing]

I always "sort of" knew how a carb worked but don't work on them so never really looked into it. Good explanation though. Now I get it. Do automatic transmissions next because they still baffle me!

[@DaveFromColorado]

Is there any way you would be able to pass along information about the Taurozzi Pendulum Engine ... Why we don't see it today, how much more efficient it truly is, little facts like that? Of all the automotive channels out there, yours is one of the few that is truly informative. The whole boost school series you did before was fascinating.

[@sx4mania35]

You can also explain the internal combustion engine.... using the anatomy of your body organs and their functions. Hell any fuel-powered vehicles in all wheel count are pretty much similar to a human body. so if you know both, you can flex of your knowledge of both automotive engineering and human biology to your dear one. except EVs where they are more like... home appliances with wheels. edit: phone typing

[@sicstar]

First i thought i live in the matrix. Now i know i live in a carburetor.

[@Ramsi-Berlin]

At first give a like before looking the video ❕😉

[@axelleaxl.5315]

A funny but nice one ! Thanks for this vid ;)

[@bediakogodfred1574]

Nice

[@mrbeast8522]

THIS HELPED SO MUCH I KNEW NOTHING ABOUT CARBURETORS NOW I KNOW HOW TO CLEAN MY CARBURETOR TOO

[@koniggigih1]

Ok next time my door slam shut on its own, i will assume that’s not a freaking paranormal activity, that’s the magic of carburetor house!

[@inflameswetrust2194]

….. idk what a carburetor is but this guy can talk about anything so long as he’s in camera.

[@rohitchopra7780]

Hey bro, love your content, always makes me easier to understand every piece of information...🥰 I really request you to make a video on how to perfectly adjust air&fuel mixture in carburettor in bikes.. Thank you ❤

[@staticcorvette5998]

This may be the most gear head thing i’ve ever seen

[@and_bold]

Did you choose your apartament upon this room layout? :D I imagine such discussion with wife... "Honey, that other apartment was not flow-efficient..." 😂

[@d4a]

🤣🤣🤣

[@burningred9562]

Thanks for explaining carburetor witchcraft. And all other concepts of engineering too. I just become curious about vr and bugattis w16 engines. And I don’t know any other person who can explain it better than you. Guys, let’s hit that like button if you want to know more about it too 👍

[@d4a]

I've been planning to do that video for a long time, I'm sure I'll do it eventually

[@burningred9562]

upd: just found a video about VR configuration. So basically main interest is W, which is Two VR’s combined into another V. Is it considered to be “iconic” or just an expensive toy for boys who like big numbers?

[@ThZuao]

SmarterEveryDay also has a video on carburetors. Made a transparent one which actually worked for a 2t lawnmower engine. But I remember thinking he forgot the needle valve. Didn't need it for that application aparently.

[@F14Goose37]

This wasn't quite the episode of D4A Cribz I was expecting but I'm not mad about it one bit.

[@charleshulsey3103]

When it's nice outside, I open and close windows and doors until I get some good air flow through the house. It helps with air conditioning power usage. 😅

[@alsa4real]

Can u make a video on the Communicator valves used inside the intake plenums of the C8 ZO6 Corvette that gives it an impressive flat torque curve?

[@Macintoshiba]

Ayayay.I appreciate your demonstration, but I must warn you about letting doors with glass inside them slam shut! Ive had my fair share of glass panes shattering from exactly this.

[@llmexicanlm7885]

Know this is off topic but would you be willing to do a video on the science on unequal length headers and how different sound and power can be produced between them?

[@NotAnonymousNo80014]

Can you do something similar but for the 'birds and the bees' talk?

[@Guynhistruck]

Another good real-life example is going to a bigger city, especially during somewhat windy days. Because most metro streets are set up in grids, forming constricted pathways between tall buildings which create higher air pressure, you get that extreme difference between air velocity on streets parallel to wind direction vs. thise perpendicular to it. Since the constricted flow further increases pressure, velocity, and also the directionality of the flow, it further lowers the pressure on the streets between the high pressure paths and make the difference even nore pronounced. The entrance to my workplace is on one of these lower pressure streets, and every time it gets windy, my ears pop and ache when I leave tbe building.

[@ThisIsRocker05]

I've never seen "promaja" being used to explain a fundamental concept.

[@KanzakiZD]

this explains the horrors of doors slamming itself, i'm always sure that there's no such thing as ghosts lul

[@bluvenm]

I never knew carburetors were so complicated

[@gosponzak3246]

Zatvaraj prozore! Ubice te promaja. ;)

[@tomwatts9822]

forget engine, you just explained a whole bunch of ghost videos

[@calebrimbor1730]

Such a great video! I have a question I was hoping you could help with: on many 2 stroke engines they have the capacity to be 'tuned' when working at different altitudes (air pressures). What does the tuning change within the carburettor? Does that make sense?

[@Mad-Jam]

You had JIS screws on the carburetor (JIS cross mark indent). New video tips: How to use PZ, PH and JIS bits. Many people uses wrong screwdriver on Japanese manufactured vehicles and destroys the screwhead.

[@monad_tcp]

I was expecting you to make the window vibrate and produce a hum just like in other video I've seem the other day.

[@racghineering]

hhahaa your not crazy but crazy and nuts like i am. now we same though..🤣

[@ThunderBassistJay]

The temperature of the air will also change slightly, caused by the Joule-Thomson effect. Less pressure equals more entropy, thus lower temperature. 🤓