Why Does Duramax Have This Exhaust Tip?
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- čas přidán 24. 07. 2024
- It's for the venturi effect and allows the exhaust gases to be cooled before the. exit the tip, which then reduces the chance of burning someone or catching something on fire.
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My 19 Duramax did a regen last week, and even with the exhaust tip cooler, the exhaust temp will burn the crap out of your hand from a foot and a half away. HOT AF.
Def is bs
AF= Auto Focus
af = as fuck
@[][][]MANN Hot autofocus is what I meant.
Rip that s*** up and do yourself a big favor...
Banks 5” monster exhaust will reduce temps
Powerstroke venturi tip is more discreet? Have you seen them? The vents on the PS venturi tips are right out in the open at the edge of the truck. The Duramax venturi tips have the vents like 16 inches back from the edge of the truck and much more out of sight (though they're still not unnoticeable).
GMs is ugly though, so it sticks out more...
Fords are beautiful tips look really decent
Most modern diesels with after treatment use the diffuser. Gillig transit busses I worked on did too. It’s to pull in air, to cool the discharge air exiting the pipe.
It reduces the risk of catching grass or tree leaves on fire.
I drive Kenworths in Canada. My Province had a massive forest fire created by the DPF Active Regen. Basically, it was AR on the highway, he parked his truck because he hit hours of service, parked close to some trees... the 550 Celsius exhausts caught the trees on fire, started a massive wildfire.
It gets that hot during a regen???
@@DubstepMagiic yes it does
Reminds me of the fire in The Sopranos
That is so true, we measured a regen temp & at it was over 1100 degs. The high temp is what is need to burn and create the ash from the soot and to clear the exhaust. So the fuel is burning in the exhaust.
@@DubstepMagiic i've done regens on small diesel cars and you can see parts of the exhaust and turbo glowing red hot.
their have been MANY MANY fires started here in montana from pickups and semis going into re-gen while harvesting
even with the tip...... sometimes its just THAT dry out their
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its so bad.... some farmers will NOT let a vehicle into his fields unless its FULLY deleted
no DPF, no SCR, no cat converter, ETC
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.
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simple fact is......
1 wild fire puts out WAY WAY more emissions than 1 deleted pickup truck can in 1 MILLION miles
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fire in a combustion chamber is controlled..... and 99% of it gets burnt (even with a "deleted" pickup)
but fire in a field is SUPER low compression..... its a raw and incomplete burn
Gasoline engines can set grass alight as well- their exhausts naturally get hot enough to ignite grass after a highway drive, even with no emissions equipment at all. Used to be a big deal here in Australia because it's usually hot and dry, plus our rural roads often have unmowed verges- people would pull over onto the verge of the road, stop in the long grass and touch off a bushfire.
These days most rural people drive diesel utes, so the DPF regen cycle has become the main fire danger from vehicle exhaust systems. The main thing to do is make sure you don't drive in long grass after working the engine hard!
Man this is very interesting I never thought about these consequences. You know what would never cause these issues? HOOD STACKS BABY 😁
@@nerd1000ify it takes much taller grass for a gasoline engine. Enough to touch the header or catalytic converter. When your exhaust pipe is shooting out mega hot air, or worse a DPF malfunction (plenty of cases and wildfires to show) and starts shooting out white hot metal frags, a fire is inevitable.
@@user-cb1ln8vc8d we have had MANY fires from gas engine cats
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Modern pickups arnt that high off the ground (less wind resistance for better MPG)
.
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But ya... either have to delete it
Or be really careful
.
.
Already had an out of state city slicker set a ditch on fire
.
Pulled over to take a phone call
But you can drive and talk/text in most of montana
.
Only billings has no cell phones
It's a city ordnance, not a state law (montana)
@@kainhall that's more of a common sense thing. Any vehicle sitting in tall dry grass will eventually start a fire. Catalytic and DEF equipped cars will do it a lot quicker and a lot easier due to that being a low hanging and extremely hot component.
Great analysis. My Nissan Titan XD has a similar exhaust tip. My truck rarely goes through active regeneration. Now I know why... I do lots of highway driving.
You failed to mention that the LMM motor has this system too. Unless Duramax owners have a 07 Classic body style (equipped with an LBZ) The LMM equipped will have these tips too. It's also worth mentioning that the LWN 4 cylinder Duramax engines also have this system as well.
Usually you don't see it too much on trucks with stacks on them but the ones with a downpipe by the framerails tend to have various sorts of fan shaped tips that sort of disperse exhaust gas into a wide arc
That isn't quite how they work
Actually a lot of trucks with stacks had them from 09 to around like 2011-12ish when they went to the DEF SCR systems.
thank you for answering this question... Nobody has answered this answer until now... I have also seen this on GM gas pick up engines
I just deleted my dmax and left the factory tailpipe on, I gained 20% on fuel mileage, a noticeable increase in horse power and best of all it runs a lot cooler!
So what’s your average and How do you get it inspected
@@melvinharvey8279 depends on where you live/gotta know a guy.
what dmax do you have? you saved the engine
Gatta use another word other than “delete” the epa is watching 😂
@@michaelscallon5676 the epa is getting stricter and sticter
Very informative.
If the gasses at the tip are that hot that they need to be cooled, I would think the pipes under the truck further forward would be just as, if not even hotter so I'd say there would be a risk driving through stuff like tall grass.
i second that roflmao, i remember a friend idling on my field chilling and watching migrating ducks come in. then. the scent became stronger, as it slowly phased into wood-hay burning smell. sure enough. under the truck lit 4 ft long 1.5 -2 ft wide char mark on the field.
So basically what im getting from this is its catching soot to keep it from coming out the exsuast to make it seem clean just to burn it off later so you can't see it when it actually comes out
No, it's meant to completely burn the soot before it exits the exhaust in a similar way as gas vehicle has catalysts.
However disel exhaust is generally too cold for a traditional catalyst to work, so a DPF filters it out until the temperatures are hot enough to completely burn the soot so only less harmful gasses remain.
@@elivestin5353 i wish i understood cause the only way i can see it is its gotta come out eventually and it just seems as how i said it in the comment above
@@adambreckenridge3741 want me to explain?
@@adambreckenridge3741 High temperatures in a catalyst are able to burn off the soot and gasses. This transforms the exhaust byproducts unto less harmful byproducts.
It keeps the emissions cleaner in city driving conditions where traffic and population is dense and pollution is high, and then burns them off during highway driving conditions.
Insane emissions standards, what an understatement...
Dead the fed is what I say.
More like designed to have to be fixed every 5 miles. Old cars last longer than new ones.
@@classicv8dude268 no they don't. New cars operate trouble free at massive intervals that were unheard of fifteen, twenty, and thirty years ago; let alone any time before that.
Only somebody who doesn't know anything about cars can think they are less reliable today than at any point in the past.
They are not insane. Diesel emissions are disgusting and cause serious disease. Only a moron wants to be exposed to these particles, and he and his children suffer the consequences. DPFs are not perfect, but they are very low maintenance these days, and still improving.
@@microcolonel typical progressive leftist talking points, you have no idea what really happens with diesel engines and the emissions they produce...
I'm just glad my truck doesn't have any emissions stuff is just straight pipe
Regen is not going to occur in any of the suggested scenarios (heavy traffic, forestry work) with the exception of a dealer working on the truck and forcing a stationary regen. However the risk of entering heavy traffic or parking during or immediately after a regen are possible scenarios. I've parked up and had the hairs on my legs singed by my Iveco Daily, but it rarely regens as it works hard pulling a trailer.
I think those things are possible as they aren’t going to be constantly working hard enough to no regen and it even more likely to happen when driving in tall dry prairie grass.
Never really thought about it. Then you mentioned Venturi effect, and the dime dropped. Thank you.
Semi trucks have a warning light come on when exhaust gets too hot. Also placards that state do not park near structures, brush, etc….
Simple yet clever idea.
The powerstroke is anything but discreet lol I noticed those before duramaxs
the venturi effect is also how modern tank guns vent the fumes giving the iconic barrel toot after firing
In the fire service they teach not to lay hose close to the apparatus exhaust so that there's not a hose failure if they truck regens during a scene.
Hi there, I was just wondering if there aren't some emissions exemptions for diesel equipped fire and other emergency services vehicles? (I honestly thought there was, unless that has changed?) would hope there are, and if not, in mho there should be. Good comment btw
Been wondering why chevy put that little jet pump there for years now, thanks for the explanation
Sooo glad my lowly 6.5 doesn't have to deal with any of this nonsense :D
It helps cool down the rear bumper when the spark plugs get too hot.
Can’t forget that it filters the ethanol out of your fuel
Early Ford Diesels were starting brush fires. Some even had flames shooting out during regen. That is a very hot condition
If by "early" you mean "6.4 liter Powerstroke" which was introduced literally 25 years after the International Harvester IDI engine was introduced in 1983 lmao
"early" 🤣
@@TheRealPOTUSDavidByrd yeah I meant early with after treatment. Pretty sure IH’s IDIs didn’t have regen.
@@yolo_burrito I'm picking on ya bud, but yeah regen wasn't a thing until MY2008 for most, if not all, diesel trucks from the Big 3
When ford was testing their trucks on I75 in Michigan they started to melt bumpers when the traffic stopped and they were just sitting there.
TL, DW: it cools the exhaust, particularly during a Regen cycle.
Bro, thank you
Will it hurt the engine if you were to shorten the tip and add an elbow to divert the exhaust to the side of the truck
I always wondered because school buses "suffer" from LOTS of unexpected, unplanned regen cycles. Mid-route sometimes. Often really. Stuck on the side of the road while a regen cycle runs. Most school buses do spend the majority of their time below sustained highway speeds.
M
I
School busses do not run hard enough to burn the DPF the way it needs to be, its too much stop and go. they should have smaller engines, or be tuned to burn more rich (but that would eat away the fuel efficiency lol)
@@deadstroke82 Gasoline buses are making a big comeback even as electric purchases increase.
@@jonmiguel alot of smaller fleets have gone back to gasoline because of the headaches.
I always thought it was for cooling as the only purpose I could guess was to mix exhaust with fresh air, but I wasn’t really sure why. Thanks!
I would point out that with it cooling down the exhaust tip only it’s not for fire prevention but instead just for keeping people from burning their legs while getting something at the truck bed etc. a vehicle, diesel or gas is a fire hazard when driving over tall dry grass because of the catalytic converter(being the hottest and often lowest point in the exhaust), it’s actually what started the wildfires in Northern California about six years ago; guy out in the hills did a U-turn in his driveway and drove off the road a little bit and lit the grass with the cat.
For instance, a 6 inch long air mixing Venturi would not have prevented that Ford truck at the end with a flamethrower exhaust from lighting gas on fire with its exhaust tip
Almost as if its a stupid idea to have one in the first place. Hmmm.
When they first started putting regen on trucks the regen exhaust would melt car plastic car bumpers in traffic. So those flutes are to draw in outside air and cool the exhaust. Same reason why Ford has the same thing. Not sure how RAM gets away with it though, haven't looked into it
It's also there to prevent burning the trailer you might be towing. Some of them have fiberglass front accessories, plastic trim and so forth. It's been noted many were damaged due to the heat from the exhaust tip.
@@willl84 probably figure most people know they are junk so they stay away anyways?
So glad my truck was 02 lb7. Sad I had to sell it, but one day I'll get another 1. Or just straight pipe an lbz and call it a day. I like the concept of owning one truck for life
Review those Mack truck diesel engines. The old Renault engines they had to the cummins mp series
I need help for my pops truck its a 2012 duramax obviously with the def/dpf system and it’s currently giving him a warning of 60miles before going into limp mode or what ever bs it will go into. The thing is i want to get rid of that system entirely do the whole delete thing but him being old school not sure if its something he will do unless the repair cost is too much.. now my question is, is it worth keeping that system and repairing it or deleting it entirely?
Great stuff thanks for sharing - Mike
I have a 6.7 Cummins and a 6.6 Duramax L5P. Neither truck has ever done an active regen in 80K miles on each. I enjoy the fact that the trucks are quiet, no smell, no smoke... Hell, if you drove my Denali and didn't know, it'd be hard to tell it from a gas truck. If you DRIVE IT and don't baby it around, you won't see active regen. I commute 60 miles and tow a lot... never happens.
I always wondered why some trucks had that gap in the pipe thank
A landscaping company I worked for was pretty bad about truck maintenance. Had an 07 powerstroke with an injector that would randomly hang open from time to time and dump soot like a diesel drag truck spooling up to launch, at idle. It ran regen cycles daily.
I went to dump some leaves and brush one day and it went into regen as soon as I started to lift the dump insert. Caught the brush pile on fire in seconds.
Told the owner we needed to deal with it as it was not only dangerous, but terrible for the engine to regen constantly as that era powerstroke just dumped extra fuel through the injectors and washed the cylinders out and diluted the oil. He wouldn’t believe me. I did an oil change and dumped 6 gallons of “oil” out of an engine that takes roughly 4 gallons. I hadn’t added any oil since the last oil change. He dismissed it.
I grenaded that engine about a week later. He blamed Ford and said diesels were junk 🤦♂️. Funny, my 6.0 powerstroke will still annihilate the tires at 30mph despite 250k miles on the odometer. My truck was straight-piped long ago and never had a regen system. It also doesn’t get run with bad injectors and I don’t drain 6 gallons of diesel diluted oil out every oil change. Regen systems are useless and will never be on any truck I own. Soot hurts nothing. And what’s the point of a diesel if you can’t dump massive soot clouds when you stomp that skinny pedal down? 🤣
Thank you now I finally know
Our Ram 5500 started smelling like burning rubber. I went around and checked the tires. In doing so I burnt the shit out of my hand getting near the exhaust tip. Turns out it was the mud flap hitting the bracket on the exhaust and melting.
I currently drive a 13 VW with 2.0L diesel and have to be careful where I park. Its caused a grass fire and when I see my daughter, it's been known to singe the lawn. As another person said above, the exhaust will burn you if the stand near the muffler.
I believe that video of the powerstroke shooting fire out the exhaust was the result of diesel in the def tank.
Yup, that's been confirmed for years
So why do they get larger in diameter near the end or tip?
Thoughts on the Duramax I6 3.0L put in GMC Sierra?
I made something like this for a flamethrower exhaust on my kz750 powered atv. The flame went from yellow and smokey to blue like a blow torch.
So what benefit does the dpf give if it just burns the excess soot it catches? Either way it's going into the air
instead of releasing carbon and nox from the engine into the atmosphere it burns it and creates ash which isn't as harmful and can be degraded in soil which most of the time the ash doesn't actually exit the exhaust tip cause its burned up completely.
Is it fine to have an exhaust like this on an older truck with no emissions rules? I think it would only bring the exhaust temp down a little.
I will say I have a 2016 lml and I cut that tip off and put a 6 inch Mbrp tip. I’ve never had it get to hot to put my hand in front of it during regen
The cuts help keep mud, snow, potatoes whatever from plugging the exit too.
Potatoes? Seems suspiciously specific.
But you did get a giggle out of me at work thinking about the foomp sound of a potato being ejected from an exhaust pipe.
@@Tactical2Wheels I hope you have a good day, ride safe.
@@jasonmoss6891 thanks. Keeping the rubber side down and the shiny side up
Nice ass end of a fiero.
Interesting thing is a few reciprocating engines have the same system in the aviation industry, but for a different reason. The Venturi sucks more air from outside the exhaust system as explained, but then of course it has to exit. As the Venturi widens, that extra air also gains pressure, therefore giving a (small) amount of thrust
Sounds like a quazie ram jet with an external energy source...
Not reciprocating but I remember the exhausts on some of the turbo fan engines were like 10% of their thrust
@@greengoat5654 Yeah, thats the jet engine portion. Those engines are just a comparatively small turbojet engine with a big fan on the front
The arsonists in California part😂
So instead of blowing smoke all my soot goes in my dpf and then it gets burnt and blown out of my exhaust. How’s that cleaner?
Common misconception about how a DPF works. Solid smoke can't go through the DPF even during a regen cycle; when the regen cycle happens the soot gets burnt to CO2 gas using residual oxygen in the exhaust. CO2 is more or less non-toxic, unlike the various residual combustion products that 'hitch a ride' on soot particles if they're allowed to escape from the exhaust unimpeded (e.g. polycyclic aromatic hydrocarbons, which are known to cause cancer).
Sadly this does slightly increase the global warming effect of a diesel engine, but it's better than giving kids cancer by rolling coal, and it also helps with local climate because high levels of black diesel soot tend to decrease the reflectivity of the earth's surface, leading to higher local temperatures.
Even my Ford Escape, with its turbocharged engine, has a similar design. I always assumed it was purely cosmetic.
btw the ford shooting flames out of the tail pipe is not normal operating condition for the active regen, this was happening when some of the old fords would get stuck on active regen mode and would not shut it off, so it would eventually burn off all of the excess soot and the diesel fuel would still burn in the tailpipe creating a literal torch.
The way emissions testing is done is to stick a probe into the end of the exhaust pipe. by using the venturi effect to introduce air into the exhaust it dilutes the exhaust giving lower readings on the test.
Nah, not anymore
All obd2 vehicles use the onboard sensors.
The sniffer is only on obd1 and some older obd2 vehicles
Emissions test probes will see if there is too much oxygen in the exhaust gases and fail you for having a big exhaust leak. Lawmakers are not quite that stupid..
@@k5guy False, California shoved a probe up the exhaust on my 14 Cruze with a gas engine.
@@slwsnowman4038
I've never heard of a post 2000 car with a sniffer. Did they put it on rollers too?
All newer diesel pickups have some form of this, it's to draft fresh air into the exhaust
Stuck around to the end for the bit where you repeat everything you just goddam said 😉
I have a ford diesel tip on my gasoline f150 looks badass
Remember those old videos of power strokes shooting fire from the exhaust at idle?
Well I learned something today.
Mine is straight piped and I get 13mpg any tip to get better fuel mileage
I have a video of a cat c15 acert doing a regen, you can see the exhaust pipe turn cherry red
In short it causes a scavenging effect and forces the exhaust gasses out faster at higher rpms
I have found over the past 5 years my 08 Duramax works MUCH better having removed the DPF and EGR 👍
Gonna call BS on the Ford being more discreet. Right on the very end of the exhaust tip it's super obvious.
Same here my 06 Duramax is completely deleted would not have it any other way.
The bigger question is how much power is being robbed by the restrictor at the end of the exhaust before the venturi ports? Banks Performance claims a bit of power being added by just adding their DPF back 5 inch exhaust. Personally I think just cutting off the restrictor would produce close to the same performance results. FYI I have noticed that adding a Banks monster intake on late model L5P duramax engines really extends regen intervals especially when towing. On my 23 duramax I was regening every 200-250 miles when towing heavy. Now with the intake I am going close to 700 miles and I can watch my soot level drop from passive regens that I never saw before the intake upgrade. I have seen this benefit on numerous L5P's that I have sold intakes to.
"Flips over to active regeneration" now what if you were to turn your truck off when that happens?
Would it still proceed to get up to a thousand degrees while the truck is turned off?
No
straight pipe and forget it
Put your head up to it when it’s in regen mode. This video is 110% accurate- GM Tech
Not a good idea...we park em where they're not close to ANYTHING during regen lol
@@robertgoodwin2787 well aware, SI will even tell you to not park it next to anything that could be damaged by heat
I have a Dodge that did not come with a goofy looking tip like that. Never have had any heat issue coming out of the exhaust like you mention. How does Dodge keep it cool?
Dodge has a variable geometry turbo that regulates exhaust flow. In simple terms it’s able to creat heat closer to the engine and let the exhaust pipe cool the gasses before it gets anywhere near the tailpipe
It’s a deer whistle, too!
How come ram cummins don’t have them
the ford f550 has one that looks like that at work
Question: If the exhaust gas needs to be hot for the DPF to work, why not just put the DPF closer to the exhaust manifold?
Putting it directly in the engine bay would cause extreme heat and would by time destroy rubber seals and hosed. It is a big fire hazard. Although newer trucks and cars do have it basically attached to the turbo.
The DPF filters while cooler, slowly getting plugged. The computer has to burn the dpf hotter than exhaust gas to burn up all the soot it catches which then opens it up again.
I love my straight piped LBZ
Ahhhhh the blunderbuss
That's why you delete and straight pipe it. All that junk does is make you have less hp, fuel mileage and it literally makes your engine eat itself inside out
Knowing is half the battle.
I always wanted to put one of these on the truck further up the exhaust so that when you did roll coal it was like it was coming out of a rocket....
They could also use stacks :)
Is Def fluid a part of that
Ford and ram do this too wondered why no i know
I doubt the trucks in my area have this. They are all straight pipes. The noise level is unbelievable during the day. Same for the semi trucks.
All these emissions systems are so annoying and can be complicated and cause alot of problems. Deleting emissions systems is the best thing you can do
I agree.
But don't answer the door if official looking guys in tacky windbreakers come knocking at your door.
#theyrewatchingus
could keep the dpf if we actully could control the regen ourselves.
Get a pre emissions diesel less headache
Always keep the dpf, just gut that fuck and code the regens out, all i did on my audi, never failed inspection cos it looked like everything was there
The Eco Diesel Grand Cherokee in particular is awesome without emissions lmaoooo
Every think it’s there to pull fresh air into the smog testing machines
It’s for the diesel to drip out of when the dpf pours fuel out when the owner lets it idle too much
It does say in the owners manual NOT to idle the truck
This exhaust tip is used on the newer def diesels. Either way, the def or diesel fuel woudnt drip out of the exhaust, the point is to use the heat produced and the diesel fuel or def to burn the soot. Like he says in the video, it oxydizes. Its not enough to "drip" out of the exhaust. That would ruin the point of all the emissions equiptment.
Wow..... Rip it out
Nobody but you, and possibly another guy, reads manuals. I have come across manuals that have never ever been opened. I come across this while looking for fluid and fuse specifications.
My name is Bryce. Nice.
I just de evolved seeing these.
So that DEF type stuff simulator to catalytic converters how to they not instantly clog on if you have any sort of high miles on the truck? If it’s like a filter I’m assuming if you were to get one of these trucks up to a million miles it would not run at all that stuff would be clogged ip so bad and I’ve time reducing your power to none
when the filter starts getting full the car or truck will go through a regeneration cycle which clears it out again. If the system that clears it fails then it will clog and reduce your engine power.
When will they decide it's better to just burn all of the fuel while it's in the combustion chamber?
Some guy thought it was to fool the emissions test lol
Those vented tips is to reduce temps as it exits exhaust and reduces diesel fumes!
It doesnt reduce any fumes, lol
@@Dave-dh7rt ever look at a diffuser on a jet engine? On jet engines, they mix ambiant air with hot exhaust to reduce noise, soot and smell.
Lol...ok 👌
In Kansas exhaust pipes can literally be J pipes,that’s right open headers…not sure about diesels, but for my question say that it is true… would Federal Law still require me to run all the Factory garbage under my new 2023 Ford F250?
my lwn zr2 colorado has it too
D4A must be your brother 😂
So your telling me that gm could have saved by just straight piping it?
Pretty clever, you can actually make a vacuum cleaner out of an air compressor doing something similar.
Super duty’s have the same cutout
I wanna hear how it sounds at the back on a 2x4in1 gas V8
wasent sure exactly before, but now i know. i'll still stick with my lb7 and skip all this emissions stuff.
I think it also is just a way to cheat the emissions. They measure it at the tip of the pipe so they dilute the exhaust heavily with that system and it makes the exhaust look a lot cleaner on the tests.