Broken knees🤣🤣🤣

@@vinayakhuracan5182 Yeah look at the middle kid, legs like toothpicks. Would snap even against the rubber wall.

@@JonMartinYXD 🤣🤣

Me too. It brings the concentration in an interesting way!

I wanna find out if that really happened correctly in real life

Yup, your last point is the most important. Learn engineering doesn't even try to teach us calculation forms (or whatever they are called), actual numerical values or complicated theories. No one would watch these videos if such things were involved. The point of Learn engineering is to teach us the engineering principles and basics of certain actual real-life items, and it succesfully does so.

silencer itself means something, muffler is also meant by scarf muffler

Schools and Colleges clutter us with Formulas & Maths...instead of the phenomenon

@@coontent-tv silencer means that it is completely silent

@@jaakkotahtela123 silencer means the device which silences the loud sound but different varieties of silencers varies the sound level same applies on firearms UK people call is silencer and US people call it suppressor

L + ratio

haha that is so detailed!

🥵

when you realise that this is completely wrong...(completely inaccurate analogy) Air particals never stays at same position neither they want to come back at same position, Air particals always move in different directions and collide with other Air particals, their movement will always be random to observer, the sound is just more collisions in a perticular area, the collision then collide with nearby surrounding particals in all directions and since there are countless other particals these collisions fades out after a while, meaning collisions transfer to more and more particals.

@@Phyjix You're absolutely right! But still gotta admit that they've put a lot of details in video. A lot of the anologies in physics are very inaccurate, but still we use them, because those anologies helps us understand these phenomena easily.

Nah, they used air

Boo hoo. My nieghbor has freedom to do things I dont enjoy.

Similar tech

Me too lol

Same

@@riba2233 not even close

@@slipknnnot similar principle (breaking sound waves) but different execution

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"Also the description about how fibreglass works in absorbing sound waves is wrong. " Care to elaborate on what he mightve gotten wrong??:o

yeah sound guy here too. know about sound but not mufflers. i felt that the explanation of the muffler was a bit short. the animation drawed what looks like a tesla valve or something - with sound going backwards & cancelling itself. my thought was that yes most of the sound would go straight through & out the hole. is that right?

@@pepe6666 thats not how sound works, (see last part) i m not an engineer but i think muffler sould make air particals collide more and more randomly with flexible material which absorbs these collisions which sould produce more heat since heat is also just collisions. these should work much more like the triangular fome that sound studios use. [ about Sound ] "they used completely inaccurate analogy Air particals never stays at same position neither they want to come back at same position, Air particals always move in different directions and collide with other Air particals, their movement will always be random to observer, the sound is just more collisions in a perticular area, the collision then collide with nearby surrounding particals in all directions and since there are countless other particals these collisions fades out after a while, meaning collisions transfer to more and more particals."

About sound they just simplified things to understand, also usually that air particians stay more or less in place (example with speaker) and that generalization is accurate enough. Its like a people on concert, they are moving and staying under scene at the same time ;)

Roughly 20+ years ago, I worked on the Liebherr super haul truck to develop a muffler to reduce the 3500 HP engines noise as the mining site was near a housing community. The muffler was successful...significantly reduced the noise...the government was happy I guess....now your government has gone mad...

Im

That's why there is so much fuss about tuned exhausts in high performance engines / racing industry.

what is the reason we need back pressure, i mean it just makes the exhaust gas back to the cylinder. i believe the reduce in power when you removed the mufflers was because you also reduce the exhaust scavenging, and therefore the exhaust gas from a combustion that happens from another combustion didn't get sucked completely

If there's no back pressure, the fresh air and fuel will not only sweep out the exhaust gasses, but they will also begin to exit with the exhaust gas, resulting in a loss of fuel and air which reduces efficiency. If the back pressure is too high, the exhaust gasses can't all be removed by the fresh charge.

Dunno about that, my muffler opened up because rust ate away the metal sheet it's made of (2006 car) and now the car flies... definitely an obvious power increase.

@@techalyzer most likely you’re still getting the choking effects from the catalytic converters. Reducing back pressure is a winning strategy, in many cases; that’s why large bore exhaust systems with properly tuned mufflers work. In your case I suspect the factory exhaust was very restrictive, for better emissions and cheaper manufacturing.

Exactly what I've been asking, too!

i believe they already did the power steering including the EPS one, if not then there are others who made the animation too

Then your muffler is of the chambered type. Glass pack type mufflers are the ones that have fiberglass on them.

That's the design with the cambers, that is used in suppressors for guns. The advantage is that it lasts much longer and it's much more sturdy (that's why its used for guns). On the downside it's heavier and needs more volume, that's why it's usually not used on motorcycles anymore. * He should have also explained that. * Furthermore ("sport") mufflers for motorbikes are often created to break partially down after a short period of time and make much more noise then they're supposed to. That's much harder with the sturdy design.

@@StellarSurge because motorcycle are hobby objects and not ubiquitous every machines like cars

Yes. Those are called reactive type mufflers. They work by reflecting the sound waves back towards the sound source not by absorbing them.

@@cereal-killer4455 Except in S.E Asia, South Asia and Africa. There, they are the main transport means for the masses

Well no, the exhaust makes the explosions happening in the engine quieter, so therefore running it without one or a straight pipe is just the natural non dampened sound of the engine

@@peeqo either you didn't understand the guy or you didn't understand the video. Exhaust pulses are caused by the difference in pressure between the cylinder and the exhaust duct, not the combustion process itself. Since a good part of the thermal energy released is used as work, exhaust sound compounds a small portion of the energy that is rejected by the engine.

It's worth mentioning that a significant portion of the sound energy is radiated through the engine. Those combustion pulses do propagate through the walls of the engine, especially when it comes to air cooled engines. This is immediately obvious when you put an exhaust duct into a bucket of water. The remaining noise observed is now mostly due to radiation directly from the cylinder block and head, which themselves are vibrating just like the air, albeit in a much lesser form.

​@@captainotto Excellent point and thanks for bringing it up.

​@@dovilacus The video is correct by strict definition. But.... It doesn't take into account that most camshafts create a scavenging effect by getting the exhaust valve open during the last of the ignition stroke. Some of the noise we hear IS actual burning fuel escaping the exhaust system.

American right?

@@kevinfernandez9999 Well, yes.

Thailand

@@gezzapk awowkwok, good description

It's an Asian thing.... People call them silencers in Asia

Muffler is definitely a better name.

Most generators do have silencers. The problem is that the ones fitted to most small generators aren't very good. But the reason those mufflers aren't very good is because the block itself also generates considerable noise. This is because portable generators need to be light. If the engine block was thicker it would be quieter, but then it would be heavier. And also more expensive. You could put the entire generator inside of a soundproof box, but then you would need to tap energy from the generator to drive a fan to keep the inside of the box cool. So now you are adding weight, and cost, and reducing efficiency. Then there are even more complicated issues such as needing to maintain a constant RPM regardless of load in order to maintain 60 Hz output frequency. You could add an inverter here, but again that adds cost and limits peak power output.

All of them do. Cars that are straight piped do not come like that from the factory.

surprisingly enough the muffler in a lamborghini aventador is massive compared to many other cars mufflers, yet they are still much louder because of the engine

if we are using the exact same engine, the exhaust sounds should not be that different, the difference in stock and aftermarket exhaust is because of this silencers or mufflers and also because of the length of the exhaust itself, just like trumpet, the bigger and longer they are the lower the frequencies. The engine configuration will still affect the most on the exhaust sounds

@@siontheodorus1501 Thank you Brother