How a Muffler Works
ฝัง
- เผยแพร่เมื่อ 5 พ.ค. 2017
- Here's what the inside of a muffler looks like and how it works.
A muffler is used near the end of the exhaust system on a vehicle to reduce the noise emitted by the engine. The noise comes from the combustion chamber, and travels through the exhaust stream.
The muffler has a series of perforated tubes, baffles and a trap door that redirect exhaust gases. As the gases travel, sound waves are either absorbed, or reflected and destructively interfered, cancelling them out.
The exhaust gas continues to flow around in the muffler and out the tail pipe. However, most mufflers pose as a restriction for an internal combustion engine, because the exhaust gases have to travel around, back in a reverse direction and then out the tail pipe. This is known as reverse flow or turbo style muffler.
Many mufflers are accompanied upstream by a resonator, that reduces certain frequencies of sound in the exhaust stream before it enters the muffler. On the outside, it looks like a small tube increasing to a large diameter tube, and then back down to exhaust pipe diameter.
Mufflers work on the principle of destructive interference and absorption. The walls of the muffler are made of two layers of stainless steel, which help reduce vibration and absorb sound. Some mufflers have a fiberglass material around the perforated tubes to help absorb sound.
Destructive interference occurs when a sound wave is reflected off a surface and interferes with the inbound sound wave. The high amplitudes interference with the low amplitudes, and the net amplitude becomes zero. Baffles are strategically distanced to cancel out certain frequencies.
The muffler illustrated in this video was from a 2001 Toyota Corolla. It features a spring loaded passive exhaust flap. The flap opens once pressure is built at higher RPM's, allowing the majority of exhaust gases to enter into the third and final chamber, before exiting the tail pipe.
Purchase tools used in this video to dissect your own car parts:
Angle Grinder (aka snap ring pliers):
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amzn.to/3hyoQFR (Canada)
3/8" Ratchet set:
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amzn.to/3zgHE2d (Canada)
Screwdriver set:
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Purchase tools used in this video to dissect your own car parts:
Angle Grinder (aka snap ring pliers):
amzn.to/3nyCsVp (US)
amzn.to/3hyoQFR (Canada)
3/8" Ratchet set:
amzn.to/3hA7LLD (US)
amzn.to/3zgHE2d (Canada)
Screwdriver set:
amzn.to/3tGeU1S (US)
amzn.to/3hy4Z9G (Canada)
Where’s the link for the toothbrush?
we need india
@@74nova36 Which one, orange or purple?
I can't decide. Maybe they come as a multi pack, that would save me having to choose..
Why are you posting this? Do they give you money if someone buys through the link?
The sound waves are 180 DEGREES out of phase, not 180 'percent'. It's not the same thing.
I love the way you throughly explained the muffler's function, but that toothbrush pointer just worked like a charm.
+rockerojuan thanks for the kind feedback
love the toothbrush pointer!
Mr. Toothbrush reminds you to brush your teeth three times a day.
David Bovee Dude, my exact thoughts
I was thinking the same thing...lol
pointer of a perfect teacher kkkkkkkkkkk...
Toothbrush pointer is the best
I understood everything thanks to the toothbrush.
+Tony32 haha toothbrush superhero
That's the toothbrush of clear instruction. No educational video is complete without it.
Perhaps this video is sponsored by Oral B... Maybe?
LOL! That's great!
Much better than 'talking hands'...
Surprising amount of engineering in what appears to be a simple component. This channel was a great find. Keep it up.
+Dylan Lewis Agreed, I didn't know myself there was so much to a muffler, especially the reverse flow design.
Very interesting, and informative work, speedkar 99.
It's a Toyota
I am a school physics teacher I will show this when I teach interference.Great job. Thanks
+Physics_rabbi Thanks I'm glad my video could help your class.
For best results, use a toothbrush to point
Firearm suppression is another relevant Application and easier to test variables on.
Please calculate the lowest frequency that can be reflected back and forth between the partitions. And then think about how high (or better how low) the frequencies are that have to be damped away in the rear silencer. Then you will see that the explanation in the video cannot work at all.
@@udarasamarasinghe8811 😂😂😂
Loved the sound of the muffler delete but was sad this video was so short. Love the lay man's explanation in a short video!
What an informative video! Clear well shot, very well described - and no fluff. Keep them coming boss
Thank you very much, clear and to the point is how it should be!
dude i love these videos so much i was just watching engineering explained's video on mufflers and then i was like "i wanna see the actual thing cut open i bet speedkar has done that" and you had and its beautiful
I love how you explain the sound wave with that tooth brush
+augy 183 Oh Yea... the toothbrush is the instructor now!
Toothbrush made me subscribe
+Alex McCoy Hah another vote for the toothbrush!
Can't believe such a lowly Corolla muffler has got so much engineering inside of it. Thank you very much sir!
+Dominic Fong I agree! I would have thought it was more simple
Great video. Hats off to the guy who volunteered his toothbrush for the pointer
Excellent video as always from you. Great work uploaded.
+LearningZone thanks!
Quick concise and to the point. excellent editing job. thank you for not wasting my time
Glad you appreciate my work
I am impressed with your physics explanations!
Thanks, glad you found it helpful.
Excellent video, this was something I've wondered about for a while, thank you for the efforts you've put into this video!
+Fadi Dan I'm glad you learned something
Excellent video, never imagined all those chambers inside a muffler. Thanks.
I was quite intrigued as well
First rate video.
Clearly explained.
A lot of information.
Camera showed everything that needed to be seen.
Thank you.
+Roark Gill glad you enjoyed it. Thanks
Did not know there was that much engineering that went into a mufflers’ sound-cancelling calculations. Super cool. 🇨🇦👍🏼
When they do these kinds of calculations, they're targeting one specific RPM, and probably 2nd order harmonics.
This was very informative! Thanks for being so thorough!
Awesome thanks
Excellent demostration, thank you so much.
It is quite clear to me from this video that if you want a muffler that lasts a long time, use a toothbrush. Once I saw that, I knew this guy was legit. I'm subscribing!
Haha
The toothbrush doubles the muffler life.
I'm going over this accoustics stuff in my speech and hearing science class. Thanks for the detailed analysis.
usually, in this kind of videos I'm not expecting much physics and formulas! excellent job
+Masoud Rad thanks, your right a splash of theory is always good
Loved the video, it was very informative while still being entertaining.
Glad you enjoyed it. I don't know whats so humorous though...
It's 3 am in the morning, and I am watching this. Help me
+A B but why ?
Lmaaooo
That's pretty cool bro...
No it’s 3 am in the evening
Very good video, the creator went through all the trouble to help us explore the inside of a muffler. Thumbs up both here and by clicking!
Thanks
Brilliant explanation, enjoyed that thanks.
Love this, straight to the point.
I should section a straight pipe next then
Great video bro! I wish more people made em like you!
Thanks. I'll have an updated video on this soon.
I recently learnt about waves and this video was very helpful
+Menuka Ramanayake That is I'm glad it helped you put the theory into perspective.
Thats the cleanest Iv'e seen your brothers toothbrush since I began watching your channel.
Spend 5 minutes explaining the complexities of sound waves bouncing inside the chamber and how it's important to keep them pressurized, then suggests to drill a few holes to drain the water, lol
+VanillaSnake21 Yep
Its one or the other
With OEM mufflers though I don't think you need to drill a hole, the material is much better quality than aftermarket
But I don't understand the point of the suggestion, you're saying compromise the muffler and make it less effective in reducing noise as well as create a exhaust leak for what? Just to make sure the muffler doesn't rust? But at that point it's a garbage muffler anyway.
+VanillaSnake21 yea true. Its a trade off.
No you don't understand. A trade off for what? A trade off to keep the muffler longer? But what's the difference between a rust making a hole in the muffler or you? When you make holes in it you might as well throw it out anyways.
An 1/8 hole in the muffler aint gonna do shit to the noise you bellend but it will drain all the collected condensation out. Many exhausts have them as standard so give up trying to be a smartass.
The toothbrush is the best part! Thank you!
+Daniel Climent haha why the toothbrush?
This was more informative than I thought it’d be
Glad you learned how mufflers work
Thank you for this video, I was wondering how they worked. Great job
+goriman 750 Cool glad you learned something
Love the pointer!
Toothbrush pointer makes clear explanation.i learned a lot
Great explaining!!! Love the brush pointer 🤣
Me too 🤣
Long over due vid. Anther great one to watch. Thanks
Thank you :)
Great video . Simple but useful
Thanks
nice pointer bro..reminded me to brush my muffler before bed!😂
+Luis Gordillo gotta keep it clean!
Your one of a kind. Thank you for your work; and thank you for sharing.
Amazing! Thanks
Toyota are so proud of the equipment they make that they put their name on stuff no one will ever see...Boss move!
* good vid 👍
That's because there's competition in the aftermarket so they want to stamp their name on it.
i love it how he used the toothbrush as a pointer😂
Really appreciate your work
👏👏👏
Thanks
Huh that sounded a lot nicer without the muffler.
I agree. I didn't expect a Corolla to sound this good. You should hear it now that I chopped the catalytic converter off!
speedkar99 According to AP, you will have the whole car into its constituent parts with 10 more videos.
Make me wanna cut off my muffler right now.
Mufflers stop the good sound but I think it’s illegal
I understood it all..... The toothbrush was a great teacher.....
Glad it helped
Great video!
It's just baffling !
It is!
+Jim Jimm It doesn't resonate with you?
Further replies have been muffled ;) .
You've exhausted all the puns. . . . .
Pun-ishment is in order ;) .
Bravo good sir! Bravo, well explained and simply broken down.
+timo v Thanks for the compliment
Thanks to Your Toothbrush I clearly Understand everything,, keep it up
I'm glad my brothers contribution was recognized
@@speedkar99 at least you didn't scrub the toilet with it. 🤤
Fantastic explanation.
Excellent clip just like the independent fog lights on the solara.
+Adam J Thanks! Have you tried the independent fog light mod?
speedkar99 yes on the 99 solara I did because of your awesome clip I crashed it miss my white 99 sle
Great explanation dude. Subbed.
Thanks for subbing, check out my other videos for more!
Vocally I am reminded of Ross from Friends. When the toothbrush is used to explain the graph I see a muppet. Good video none the less!
Thanks haha
Great job explaining
Thanks
Wonderful explanation 👍🏽👍🏽👍🏽👍🏽
thanks, very informative and interesting
Watching these videos could make me a qualified mechanic 👍
+Nick Makaia hmm
Mechanics don't chop stuff open or know how it works, they know how to diagnose and replace.
speedkar99 in order for a mechanic to diagnose and replace, wouldn't he or she know how it should work first??? Unless you're someone who reads 710 where the oil goes in. Lol
Thank you that was informative video how much lost me but I hung in there and now I am informed with knowledge that I can put to use thank you
Thanks for amazing video 👌
Welcome
Brilliant!
Thank you so much!
You are welcome
Good vid, good explanation
Sure is
Nice explanation , I've heard from my mechanic that if u start a car's engine don't shut it down straight away as the water vapour will condensate in the cold muffler and resonator , let it run for few minutes until the pipes become hot then water won't condensate and this will prevent it from rusting
Rust needs oxygen to form. The point of car engine is to consume the oxygen from air to burn fuel and emit exhaust gases that don't contain oxygen anymore. So how could the rust form when there is no oxygen?
@@charlieangkor8649 do you leave your engine running 24 hours a day 365 days a year? if not, there is oxygen and water in your exhaust system
@@charlieangkor8649 Yeah, how could an exhaust pipe get rust on it? Obviously, exhaust pipes never get rust on them.
Nice vid!
Good job. Got the ideas across. Not unnecessarily technical. Actually looking at a real muffler was better than a chalkboard diagram. I didn't notice the toothbrush.
Glad you found it helpful
Very informative video chumlee
+Richie Hanley thanks
Nice video explaining everything clearly. I have a question for you though. The silencer pipe in my 2005 Camry center exhaust section has something that's broken off which causes a rattling sound when the engine is idling rough or when I shake the end muffler. The affected section is the bulging part in the silencer pipe after the cat converter but before the end muffler. The car drives fine for now and there is no check engine light. Should I
1. replace it or,
2. cut it open and try to weld it back/cut the broken section off or,
3. just ignore it altogether?
I'm appreciative of your opinion. Thanks.
I loved how you seemlessly transitioned from using the toothbrush in explaining the body of the muffler to using it to explain the science.
It's my sidekick
nice job , thanks
Good job.
So clear explaining
Best channel..u r as good as Chris fix channel
+TheRouteShow thanks. Why do you say that about him?
Thank you. Well explained, does it matter if I replace a corolla muffler with another one from a different sedan, say from a nissan sunny?
professor Toothbrush
...reminding you to brush your teeth! :)
Haha...
Well done
Subbed cause the dudes pointer was a heavily used toothbrush. And the info was pretty good too ;)
+Michael Yiannett haha thanks
i like how u present the components of the video.. also the fact that u do it with a dead tooth brush: D ..kudos brother
+hybrids0ldier thanks and kudos
Nice sound w/o exhaust
That toothbrush got my vote for president
+Juan Martinez democracy wins!
Awesome video. I did not like that harsh beep at the end. But other than that, very educational and cool.
Thanks for the feedback
do they all have the spring loaded flap in the last chamber before the gases exit the tailpipe? are these flaps prone to seizing up?
nice video
this guy is great
+P Wilson amazing
Super cool!
It sure is neat
Thank you !!!
Hey drilling holes as you advice at the end to prevent rust and water accumulation wouldn't that equal to more noise ? as sound will exit through those holes instead of the chambers
Very helpful. Informational
Thanks
I don't know why, but the toothbrush helped me understand even better
Haha it sure helps
Wow, this is so interesting
+Mishir ali glad you found it so
Good stuff!
Thank you
Our teachers also not teach that much in deep
Thanks for this video!!🙏❤
You sound like beakers boss in The Muppets🙂🙂
Really good explanation
Great. Thanks.
Cool vid....
I like how he is using an old toothbrush to point at these complex equations
I like the teach-brush too
Like the toothbrush whiteboard pointer good one.
you have left me baffled
Lol good one