How Hot Does A Car Exhaust Get?
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- Опубликовано: 9 фев 2025
- How Hot Does Your Car Exhaust Get?
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In this video we are discussing exhausts, and particularly we’re checking out the exhaust of my Honda S2000 after a cold start. Once the engine turns on, you can see the exhaust manifold immediately heats up, represented by point number two which is just before entering the catalytic converter. A short duration passes where it seems like the catalytic converter takes in all of the exhaust heat, and then the piping exiting the cat begins to quickly heat, represented by point number 3. Point number 1 is the heat shield surrounding the converter, which in hindsight should have been removed, however you can still see the cat through the cracks, and as you’ll see later on in the video, the secondary oxygen sensor becomes one of the hottest points on screen.
Catalytic converters are used to turn nitrogen oxides, carbon monoxide, and hydrocarbons into less harmful gases. The idea is that for the various molecules that enter the cat, upon exit you simply have nitrogen, oxygen, carbon dioxide, and water. For the exact details, see my video on how catalytic converters work, but know that as these chemical reactions occur, they create heat. Additionally, any unburnt fuel will burn in the oxidation stage of the catalytic converters. When your car first starts it tends to run rich to help promote fuel atomization, however by running rich it also causes a burden on the catalytic converter, and can cause it to get very hot.
The converter isn’t effective until it reaches a certain temperature. Below about 400 degrees Celsius, the proper chemical reactions won’t occur. The systems are designed to operate at temperatures as high as 1000 degrees, however at this point the reactions are less efficient, and if the cat starts to get much hotter, it can begin to melt and permanently fail. It’s important to note that the exhaust gas temperatures are hotter than the exhaust pipes we’re viewing.
It is interesting to see how large of a temperature drop occurs upon entering and exiting the cat. After about four minutes of running, there’s well over a 50 degree difference. Looking at the split as the exhaust divides between the two rear mufflers, it’s interesting to see that the heat distribution, and thus the exhaust distribution, does seem quite even, with the right exhaust pipe seeing temperatures just slightly higher than the left.
The mufflers themselves remain moderately cool relative to the rest of the system, certainly helped by the large surface area and cool ambient temperatures. While the exhaust gases exiting still have high temperatures, the very tips of the tailpipes themselves, as you may expect, remain the coolest portion of the exhaust. Now looking back at the exhaust header and cat, you can see the O2 sensor has now become one of the hottest spots, indicating the heat generated by the cat, reaching over 180 degrees Celsius.
What happens as we rev up the engine? The exhaust manifold quickly heats, reaching temperatures of 210 Celsius in less than 30 seconds. Observing the engine, you can see the exhaust and engine heat shield actually does a fantastic job of protecting electrical components from excessive heat.
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I feel exhausted after watching this
lmao
K1ng_Efra And that's only from standing behind the vehicle. Standing in front will make you tired.
To recover from exhaustion, run a garden hose from your exhaust pipe to a crack in the window of your car, then just climb in, start the engine, put on some relaxing music, and have a good long nap.
so funni i cri eri tiem
That was bad🤦🏽♀️😂
You love your thermal camera, don't you? :D
Mathias Mang lol ikr
Not mine, just borrowed it for a week. But yes, I loved it haha.
a whole week of checking temperatures around the house... how warm was your cats exhaust?
wait come back bucket! i need to check your cat back
Hightower lmfao
Yeah, he's obsessed with that camera.
In the next episode of EE : how hot is the seat belt Buckle during the summer days
I appreciate the videos on how car components work. It is especially nice that they are all on the same car; it adds a lot of consistency to your channel that you use the same S2000 for the majority of your tests. Many car channels bring in a new car for each project / experiment which is nice because it offers different perspectives. I also think it's interesting to see all tests done on the same car. Test results can almost be compared across different videos. I'm looking forward to more great content!
Happy to hear it, thanks for watching!
Seeing this after a hard run/track day would be cool.
You should do a video in which you investigate the effectiveness of different types of heat-shielding materials (wraps, sheilds, etc.) and mechanisms (air-to-air exchangers, air-to-water exchangers, fins, etc.). Thanks!
Love seeing how he goes out of his way to get tools, like a thermal camera, that make it better for all of us viewing to see what he is explaining.
remember the ap1 s2000 has a AIR Pump. IT pumps air into the exhaust manifold on start up . in order to heat up the catalytic converter faster. thus lowering emission faster on start up..
Next up on EE; Ceramic coated headers vs uncoated
Yes! I think they eventually get just as hot on track
I really like what you are doing using the thermal camera. Good job and keep it up. 👍👍👍😉
Always fun to run into jason when searching random things like how hot does an exhaust get. thanks again!
It would be cool to see how long it takes to see an engine cool down. Like how long would one have to wait before needing to "warm up" again
That would depend a lot on the weather, air temperature, parking location, etc..
I watched this video to find out what the difference is between the temperature entering and exiting the catalytic converter. You did say that the secondary O2 sensor is one of the hottest points. I guess the exit should be hotter. But by how much and how can you accurately measure this when a Cat is close to an extremely hot manifold? There is another RUclips video where a gentleman also measures the in and out temps of the Cat but fails to mention mention what the reading really means. But your video is still awesome to watch. This gives me a whole new respect for the environment and how our cars affect the health of the air we breathe everyday. Especially since I have severe asthma.
it would be interesting to see a thermal video of an exhaust with and without heat wrap to see how much of a difference that makes
Hey Engineering explained, can you put together a video showing the forces acting on a car when you pull another car that has broken down? (my friends NSX broke down and I towed him home with my S2000) do you know what strain this puts on the vehicle that is doing the towing? since the vehicle being towed supports it's own weight, do tow ratings come into play? Or with a small suv?
DjJMOProductions ya that would be cool!
DjJMOProductions just watch a truck pulling video you'll learn all you need to know. The big differences are your clutch is wearing faster, the engine is under load, the engine and trans will be much warmer especially on a s2000. Just average normal towing changes.
Sounds like a good idea !!
If you must tow with a vehicle that is not really setup to do so, simply take it easy during towing. Gentle acceleration and braking, coast off some momentum before anticipated stops, drive slower and avoid steep hills when possible.
Well of course, but id like to hear engineering explained talk about what wear and tear is involved. I also have a 2009 ford escape that has a tow rating of 2000 lbs. I pulled a broken down mustang the other day and all seemed fine as I kept it slow and steady, but when i think about the difference between pulling a trailer with a tongue load, and a car that is supporting it's own weight, I can't seem to put together the math on why it wouldn't be perfectly fine for me to rescue broken down cars with my 4 cylinder escape. especially if a single person can push a non running car just fine. I assume it's just a matter of transmission cooling, but there's so much involved that I'm calling on the big guns for explanation.
I can't wait for the engineering explained video on the Challenger demon, that looks like it'll be a fun one to do.
Does a new exhaust always make ting sounds like when getting hot then cooling? My new rt challengers exhaust makes loud tings! Think its normal for new car but how long should it last if it is normal??
almost as hot as my new mixtape.
This topic is overlooked immensely. Offroad driving in tall dry grass causes a lot of wildfires. What do you recommend? Wrapping help? I've lifted my truck 7" and run 35" tires for more ground clearance.
Seems like you're really enjoying this new thermal camera you got ;) haha keep it up dude, hope to see more stuff with it soon.
i love thermal imaging.
Hey Engineering Explained, you should do a series on tractor trailer trucks. There's a lot of interesting engineering that goes into making big trucks operate the way they do.
Mazda has a small “Warm up” catalytic converters right off the headers. The engine runs rich for a few seconds to warm that up, then the main converter under the car eventually warms up
so the liquid dripping from the muffler is water?
JoraForever oxygen liquid i guess?
JoraForever Mostly. I wouldn't drink it maybe. But mostly just water, yeah.
I thought it was unburned gas but I was wrong
Yes.
oxygen becomes a liquid at -183 degrees celsius, so i doubt that's liquid oxygen lol. Most likely it's water, however.
I'd love to see this on a diesel and also when it's doing a DPF regen, I can smell the heat when mines doing one
I was wondering if you might be interested in making a video where we use the thermal camera on my 2005 Subaru Outback XT. I have a small exhaust leak and I think using a thermal camera would be a coolest way to try and find where the exhaust leak is coming from. The wagon has a turbo and we could test how long it takes a turbo car to heat up when warming up the vehicle at idle. We would be able to use the camera to see at what point is the downstream CAT is heated to it's optimum temperature (where it is hot enough to drive the car without throwing a P2096 trouble code). I usually let the car warm up for at least ten minutes. We could also test how long it takes for the turbo to cool down when idling.
I live in the Portland area! I know the more expensive FLIR Thermal Camera is going back soon, but I just thought I would mention it as a possible concept for an education video. I always enjoy watching your videos, but I think it's time to introduce my Turboru to RUclips.
Another great vid. Hope to see you to a video on the new Dodge Demon soon. Lots of cool techy/physics things to discuss about that car and its record setting performance. Thanks again!
Loving the thermal cam vids :)
The S2000 press release may shed some light on the unique aspects of the temperature rise which occurs in this excellent video. I think it's a good thing the heat shields were left in place.
"The advanced emissions equipment employs a three-stage process - cold start, warm-up, and normal temperature operation - centred around an exhaust secondary air system that allows for very quick heating of the catalytic converter. When the engine is started from cold, the ignition timing is modified to give lower combustion temperatures for reduced emissions of NOx while still maintaining relatively high exhaust temperatures. Simultaneously, multi-port exhaust secondary air injection comes into operation which allows for very quick heating of the catalytic converter. An electric pump sends air into the exhaust ports to react with CO and HC particles contained in the exhaust, thus increasing gas temperature. Furthermore, the stainless steel exhaust manifold has a dual-wall design with an insulating air gap between the walls to help in the rapid warm-up of the catalyst. The adoption of a thin-walled, low-heat-radiation, metal honeycomb catalytic converter with a low cell density in place of the more traditional ceramic type, not only increases the exhaust gas processing surface, but also promotes a quick rise in temperature."
I love that you use the unit of Celsius instead of Fahrenheit
Of course. Engineers always use SI units
hey Engineering Eplained, I would realy like you to make a video explaining compound turbos and their advantages and disadvantages relative to sequencial turbos. Keep up the good work ;)
Hey EE,
Awesome video and very educational.
Keep up the good work.
The o2 sensor is the hottest part because it has a heating element that keeps it very hot to maintain a stable reading, as the sensor is calibrated to temperature, not because of the exhaust gas being hot.
How about a thermal study on a turbo system, see how a large intercooler does a better job of heat transfer. And then if there's a best type of intercooler. air - air or air - water
You've mentioned before that you'd be interested in getting your s2000 dynoed for a baseline before doing any power mods. If you do, and if you could borrow the thermal camera again, it would be interesting to see exhaust, engine, drivetrain, etc. temps while under full load vs. just idling!
You can also install a Pyro Meter/Gauge to monitor your exhaust temps. 😉
Please do a video on exhaust wrap! I heard arguments saying that exhaust heat wrap can actually disentegrate headers over time.
The biggest problem I've found with heat wrap is that it gets wet and retains moisture.On a mild steel exhaust this corrodes the pipe. No such problems on an SS zorst though. So, yeah, I can see that being a problem on a cast or mild steel header.
Would like to see an 8-cylinder or diesel engine and exhaust temperatures. Cool video tho
Thanks for sharing. Really interesting, especially the information about the catalytic converter efficiency versus temperature.
Perhaps you might take to the next stage, say a typical shopping trip with gas analysers telling us how the cat converters perform in real situations.
I like it when he says HELLO EVERYONE.
I'd be really interested to see the same exact type of video with one of those performance turbo cars that get those glowing manifolds under boost. I can only imagine how crazy those EGTs must be.
The temperature of the outlet should be at least 10 percent hotter then the temperature of the inlet . If the converter is not working, the inlet temperature will be hotter than the outlet temperatures. .............According to your test the results are opposite
I have a suggestion. What if you did a video on metal vs composite/plastic intake/intake tubes to see which one heatsoaks more from engine bay heat?
Another great video
Thanks for your study... great
You should check out Ohlins DFV Coilovers for s2k's, lowering your cg never hurts as long as its functional, and those ohlins are sooooo composed
How does the heat of an exhaust differentiate from this one if the exhaust is straight piped, running duals, dual straights, or open manifold/headers?
No wonder why i fucken burned my hand 😂 i had my truck on for literally 30 seconds
will you try to drift your S2K? that'd be an awesome video!
we need a turbo one next! :)
hu else misses the car reviews in the foresty area
ps im not from america dont know the area name
Yea dude it's so pretty there
Unfortunately don't live there anymore! :(
Engineering Explained ohhh I see :/ where was that? And where did you move too haha I'm Australian so I don't recognise any of it :P
Ahmed Moosaji probably up in the northeast corner
Somewhere in Oregon if I remember correctly.
Interesting, I knew how catalysts worked but didn't know they operated at those temperatures. The richer mixture and higher engine speed on a cold start will heat the cat up faster, which is good for emissions.
Can you do a video of how spoilers affect gas mileage
It's a shame the heat shield was left on, I would have expected as you increase revs and load, the ecu targets a richer lambda (afr) putting more unburnt fuel into the cat causing it to heat up further. Although just free revving with almost zero load I doubt it would go into open loop though.. great video as always Jason.
You should do some of these heat "test" on a diesel truck.
u should do the heat after some hard driving.......my oem fiberglass heat shielding kinda caught on fire after a couple good touge runs
What would be the temperature of the exhaust gas? Since you said it would be different than the pipes at 1:42?
You should go to a Truck Dealership and see if you can get them to show you the heat of a engine doing a forced regen(post scr)
amazing video
Hi, do you see any advantages in wrapping the entire exhaust system?
Would love to see how well Exhaust wraps work.
When I was 8 years old, my Father and I arrived home from an afternoon drive one day, and as soon as I got out of the car, I grabbed the excruciatingly hot tailpipe with both hands.
Something to warn your kids about hey .
You should explain the difference between a vehicle with a low polar moment of inertia, vs one with a high polar moment of inertia.
Very interesting video. Also very interesting. That global temperatures attributed to global warming line up perfectly with the introduction of the catalytic converter. In 1977, but don’t lineup with the increase or reduction of CO2 food for thought.
However would an exhaust get to those temperatures when in motion due to the airflow underneath the car? Would be interesting to see that data but I appreciate probably quite difficult to film
Great video 😄🚘👍💥🔥
Sticking with exhausts, I think a video on exhaust wraps would be good.
cat converters are important i see. still love my straight pipe..
Next video: How hot do headlights get
Hi.after a tune my honda dont produce water vapor on tail pipe even on cold days... and runs on hotter exaust tail pipe. Muffler in on is way? If i shake it it seems to have some debries.. black flakes....
I loved it.
Thank you.
great video...i would like to see the exhaust temps with the engio
e under load...thanks for posting this...
He has mentioned he'd be interested in getting his s2000 dynoed before, maybe if he does that (and if he can borrow this thermal camera again), he can show us what temps look like under max load.
can u do a video on how a transmission lock works (for drag racing)
Transbrake? It engages both first gear and reverse at the same time. Since they have the same gear ratio, they cancel each other out and the car stays still. When the transbrake is released, reverse gear is disengaged and the car takes off.
Jack Duno very simple explanation thank you, I was about to ask a for a similar video
Daaaamn. That's pretty interesting. Thanks for the simple explanation. Doesn't that cause wear on the teeth after a certain number of times engaging the transbrake?
The gears in an automatic transmission are always meshed together; they do not engage or disengage like those is a manual transmission. Different gear ratios are attained by engaging and disengaging different parts of the planetary gear set. This is controlled by a series of hydraulically controlled clutch packs.
The transbrake would ideally be engaged while the footbrake is applied, the vehicle is not moving, and the engine is at idle. The wear on the transmission from in that scenario would be no different than changing gears under normal circumstances.
The only real damage you should see is if the rest of your drivetrain is not built to handle the shock of launching a 800+hp car at 5000 rpm ;)
do a cat and decat diffrence video.
Can you do a video on the benefit of headlight fluids and muffler bearings?
is the proper hvac tape important to use on a pipe break/leak? Duck bran says yes but up to 260F, while other brands claim "400 and higher". If i use the tape, what if it over heats? of if i wrap it enough with the alium tape it should be good? at moment i used weiders puddy crap and it held for 2 days and now smells.
Do exhaust wraps really work? Do they cool exhaust pipes effectively?
Engineering explained getting his money worth with his new thermal camera!
Could you do one of these videos with a DPF?
Perhaps during a regen if you can force one while stationary. I'd like to see how hot it gets while burning off soot.
THIS IS THE MOST CONTROVERSIAL TOPIC : Do K & N air filters improve Gas milage, block dirt out better, and improve Horse power?
Dylan Walter yes.
next
K&N filters allow slightly more air into the engine which will creat a slight amount of power however it also allows more dirt into the engine as well which will cause MAF sensors to fail and cause the intake and throttle bodies to get dirty quickly
Maybe do energy lost/ blocked through windows of the car, or other points on the car? Like with and without tint or something along those lines?
and how heat when the car hit 60 km/h??
Please get a nice cat back system on that girl. Stock has GOT to go. Solid content as usual 👍
I think so as well, just don't want anything excessively loud. There are a few on the market I'm a fan of, but they're quite pricey.
Engineering Explained EE you should check out mighty car mods. Moog did a titanium exhaust on his s2000. He does Nos as well but only cause he has to beat Marty
I'm 15, i have a passion in the future to be in the car manufacturing industry. I live in Australia and as most of you would know, our car manufacturing companies have closed down. Despite this happening, i still look forward to working in that industry as it is my dream job but I am worried I won't find much hope in it due to the closing of the industries. I would really appreciate it, if someone could help me in this situation.
Have a lovely day.
You should be seeing post-cat temperatures around 200°F higher than pre-cat temperatures if the cat is up to operating temperature.
Your early when it says no views lol
Exhaust wrap makes a difference over engine heat?
Hey,
There was a bit of inaccurate information you gave while explaining rise in temperatures of the catalytic converter after a cold start. Running the engine rich actually cools down the exhaust gases (yes! this actually happens) and helps save the catalytic converter when you're running at high loads and high speeds. The biggest downside of running rich to cool down the catalytic converter is that your emissions go through the roof. The interesting bit is that almost all OEM's use this technique all the time and it is well accepted by the EPA, as it helps save a critical component and most drivers barely ever drive at high loads and high engine speeds.
What heats up the catalytic converter is the spark timing of the engine. To put it in simple terms, the heat in the exhaust gases increases as you delay the spark. This kills your efficiency as well, but it plays a vital role in heating the catalyst up quick enough so that a car can pass all the emission tests and stuff. And most of the times, cars do this for about 10-20sec after a cold start.
Hope that was helpful!
So what would be the actual exhaust gas temperature (roughly) at the tail pipe?
Can anyone tell me the use of a split exhaust , why one single exhaust pipe isn't enough?
Space between very limited. especially modern cars. Since Many new features and tech need to fit in. Old cars didn't have problem with that.👌 Besides not all aftermarket exhaust system are not fits for all . Especially your engine fitted an OEM parts. 😑Step by step engine upgrades vs properly size exhaust piping is carefully choose.😊 Plus Engine Management tune is needed. Which is most Costly at the tuning step😵
@@abdulwafi2634 thanks 😊
Could you do one that looks at heat shielding on ceramic coated parts vs non ceramic coated parts?
Have you discuss exhaust wrap? Does it work? Whats the cons?
I think itd be interesting to see a video showing how wind is able to pull heat from exhaust pipes or engines (that is if they are aircooled) like how do lawnmowers get rid of there heat... I've never full understood that
I have a theory that pine trees are better ideas than solar wind etc.. Bc if grow everywhere it shades roads etc and each tree is a fuel source if harvest the sap and run engines on it.
Can you do a video on BMW Turbosteamer? It will go nicely with this video on exhaust gas temperatures.
It would be interesting to se how hot the manifold gets after a few laps on a track. Sure there will be more air moving keeping it cool but with the engine screaming up at 8k+ for extended periods of time it's got to get hot.
It would be interesting to see what the temperatures of the exhaust and brakes would be after 20 minutes of being flogged on a race track.
It would be even better if you could find a way to mount the camera on the car so we could see the temperatures during a track session.
How hot does a differential get?
or a transmition
Question: How hot (in F.) does the exhaust flange (between the manifold and the header pipe) get on a typical 4 cyl. engine, in normal use? Also, how long does it take to heat up to that maximum temperature, from a cold (70 degree F.) start? Thanks!
i enjoyed this video
Hey Jason, do you think a thermal camera is good at track day for tire and brake temperature? Most focus on tire