Venturi Effect vs Carburetor Venturi Effect. They are Different (Explained)

* VISUALLY EXPLAINED
In this video, we delve into the fascinating world of fluid dynamics and explore a subtle yet intriguing difference between the Venturi effect we often encounter in educational contexts and its application in carburetors. While both involve the principles of fluid flow and pressure differentials, there's a distinctive twist when it comes to carburetors.
Understanding the Usual Venturi Effect:
The Venturi effect, as commonly explained in textbooks and educational videos, relies on the concept of positive pressure differences. It typically involves a constricted region in a fluid flow system, such as a pipe, where the flow speed increases, and as a result, the pressure decreases. This pressure decrease creates a suction-like force that draws fluids or gases into the region of lower pressure. It's a classic example of how Bernoulli's principle operates.
The Carburetor Venturi System:
Now, let's shift our focus to carburetors, a critical component in many internal combustion engines. Carburetors use a Venturi system to mix air and fuel before delivering it to the engine for combustion. Here's where things get interesting.
Unlike the usual Venturi effect, carburetor Venturis operate on the principle of suction pressure, which is essentially negative pressure. When air flows through the narrow Venturi in a carburetor, it accelerates, creating a region of lower pressure. This negative pressure, or suction, draws fuel from a reservoir into the airflow, effectively atomizing the fuel and creating a combustible mixture.
Key Differences:
Pressure Direction:
Usual Venturi Effect: Relies on positive (pushing) pressure differences.
Carburetor Venturi: Utilizes negative (suction) pressure differences.
Application:
Usual Venturi Effect: Often seen in various fluid dynamics applications, such as in hydraulic systems, pipelines, and aviation.
Carburetor Venturi: Specifically engineered for mixing air and fuel in internal combustion engines.
Purpose:
Usual Venturi Effect: Typically used to measure flow rates, create differential pressure, or control fluid dynamics.
Carburetor Venturi: Specifically designed to achieve efficient fuel atomization and air-fuel mixture formation for combustion.
Conclusion:
In conclusion, while the underlying principles of the Venturi effect remain consistent, the application of these principles can vary significantly. Understanding this slight yet fascinating difference between the usual Venturi effect and the Venturi system in carburetors can provide valuable insights into the functioning of engines and the intricacies of fluid dynamics. It's a testament to the versatility and adaptability of scientific principles in various engineering applications.
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[@xl250mon5]

I always thought air was pushed into the venturi.learn something new every day👍

[@garymcmullin2292]

the venturi effect finds many uses of which ICE induction and refrigeration are two that I think most common, this was a well presented video, thank you.

[@arthurfricchione8119]

Thanks Craig. All the information you supply is so very helpful. Every bit of it helps to clarify how an engine operates whether it be a four stroke or two stroke. Thanks for always sharing your videos and knowledge Artie👍

[@Grahams-Grass]

👍👍👍 are you still gonna sort out this plastic Briggs carbureter 🙏

[@TheRepairSpecialist]

Yes absolutely. I will have it out very soon. Craig

[@themowerman]

Good lot of information mate

[@toddt9519]

Good video. It seems though, that atmospheric pressure is about the same as the pump pressure, pushing the air through. I could use some info on how a governor works. I'm curious also what part of Britain you're from.

[@s.davidtrout3056]

Thank you. This helps me redesign Pogues vapor carburetor

[@gospelrwanda]

The pressure reduction is due to the expanding exit and not the narrow part of the system. The width of the entry may not be important but the exit, the wide exit creates a sudden increased volume hence the reduced pressure. I would like to see the same experiment be done without the expanding exit and see if there will be any differences

[@TheRepairSpecialist]

I would like to see the experiment done without the narrowing. What do you think would happen then?

[@gospelrwanda]

@@TheRepairSpecialist What I think would happen, is that, as long as the exit is wider than the pipe the pressure will decrease

[@rover265]

Do you reckon there would be any benefit in putting a venturi pipe just before the throttle body on an air intake? Would it help suck more and steady air into the throttle body?

[@DirtRoadLanding]

Question: I looked everywhere online but I can’t find the answer to my question. Can you please explain to me or tell me if there is gas and oil mixture That makes its way through the impulse port that is on the crankshaft and through the pulse line and into the carburetor, while it is creating negative and positive pressure to pump the carb?

[@richardrichard5409]

Great video but, it is air pressure that pushes the air thru the venturi, not the piston 'pulling' a vacuum....I know it sounds counterintuitive😎

[@TheRepairSpecialist]

Ok thanks for your feedback. If this is the case can you explain how the air does this please. I would like to know that’s all, so I can see that perspective. Thanks, Craig 👍

[@cosmindragomir4119]

Hello Mister. Congratulation for your work. I want to ask you why a motor two stroke which works with a poor mixture cause a big speed and high temperature. Thank you.

[@TheRepairSpecialist]

First of all, thank you for your nice comment I really do appreciate it. Secondly, regarding your question, you have a good point there and many people wonder why this is the case. So, I will make a video on this to explain this better. Keep watching the uploads because I'm just dealing with a couple of other requests and then I will get to yours. Many thank, Craig

[@cosmindragomir4119]

@@TheRepairSpecialist ok Thank you. I have in minde this: Poor mixture: the mixture ignites more easily and ignites even earlier, perhaps with self-detonation and carburetor failures. It thus reaches higher speeds (it goes faster) but without power when you want to cut. If the mixture is poor it has less fuel in it (liquid with higher thermal interception) it heats up more (until the moment of leakage). Being very hot it ignites itself and produces a much higher resulting temperature. If self-detonation occurs, two flame fronts appear, one from the self-detonation point and one from the scate. these two fronts meet and make high noise and temp, in addition to the fact that self-ignition is done earlier. Sorry for my english. Have a nice day.

[@jacksonlamme]

How is the pressure lower in the constriction? If you exploded air into the tube I would imagine the constricted area would be where the tube blows up

[@johntirrell8553]

Referring to direct connection performance book from Mopar, snivy somehow relates to booster venturi. What is it?

[@ozarkarky]

Let's turbocharge it!