How does soot formation occur in Diesel engines? What are the effects on the engine oil?
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- Опубликовано: 10 июл 2022
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Soot formation is a hallmark of Diesel engines - largely the result of incomplete fuel combustion, it can have deleterious effects on both the environment (as exhaust particulate matter) and the engine as abrasive wear particles. To cope with this a range of measures have been introduced, including high dispercancy oils, DPF filters, improved fuel injection, and redesigned piston heads.
Hi I’m Rafe Britton, the Lubrication Expert. I’m known within the industry for my RUclips channel and podcast, and I work with mid-size industrials improve their equipment uptime while reducing the cost of their lubrication program. I’m a mechanical engineer with 13 years of experience on both sides of the industry; both as an operator, and lubricant supplier. I hold a Bachelor of Aerospace Engineering and a Bachelor of Physics from UNSW.
Lubrication Expert is purposefully brand independent and sells no lubricant, filter, sensor or hardware. I’ve helped dozens of industrial clients upskill their workforce, reduce waste, improve reliability and take great strides toward their corporate sustainability goals. I serve on the Australian Lubricant Association technical committee to push the lubrication industry forward.
Industry doesn’t understand lubrication, and few people are left to teach them. This results in incorrect use of lubricants, contamination & machine failure, leaving reliability engineers frustrated with the state of their lubrication program. The ultimate consequence is more machine interventions, more waste, and more equipment downtime
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Hello Mr. Lee.
I did comment on one of your video.
I am interested on your course.
Kindly share course content with me.
I am interested to learn about how engine design/oil pump/environmental condition/engine manufacture year determine engine oil to use. Also about issue of drain interval.
Hi Erick! There's plenty of content here on the RUclips channel, but if you're looking for more there's more paid content at lubrication.expert/product/le-pro/
@@LubricationExplained the reason for Spontaneous Charge Compression Ignition SCCI.. ultra fine atomisation ISNT desirable with injectors.. theres a compromise.. ultra fine wont jet across the chamber as good as larger droplets .. the failing with 4-stroke diesels is the need for the donut chamber to encourage the formation of a burning mushroom effect as result of the injector spray pattern.. the front of the spray pattern burns in reaction to the air in front of it .. air has to recirculate around behind the flame front for the trailing fuel ploom to ignite.. dont have that with cylinder port uniflow 2-strokes..
I finally understand what a dispersant is and how it differs from a detergent!
Hahaha. Yeah "same same but different"
It's the ethanol in fuel that oxidises.
The oxidised ethanol polymerises to form sludge.
The sludge gums up your rings.
Fuel gets past the gummed up rings and dilutes your oil.
The oils lubricating properties are compromised and you get metal on metal scoring.
N.B. The sludge issue doesn't arise if you're using fuel without any ethanol.
Low tension rings seem to be most prone to getting gummed up.
The fuel dilution and sludge problem improves if you stop using ethanol... but it's remarkably hard to get rid of the sludge entirely... even after multiple oil changes and flushes.
🙂
Tuning EGR is a good step towards looking after a modern diesel engine
Yup. But shhhh! Keep it quiet!
@@LubricationExplained haha I meant to say "tuning" the EGR to optimise less soot output.
@@LubricationExplained haha
Brilliant explanation and graphics
Thanks Simon!
Great explanation
Thanks!
Rafe, great video! I've always wondered why an EGR doesn't draw from the exhaust post-DPF in order to lessen buildup at the intake. Also, have you any opinion about the use of external catch cans in addition to the integrated air/oil separators found in the engine?
There are some engines that do that, problem is the exhaust will be at low pressure because it's after all restrictions and so it will have a difficult time reverse flowing into the intake because that will be high pressure because of boost pressure, so then you have to either artificially create backpressure by installing a valve in the exhaust and choking flow OR you have to close the throttle and choke the intake a lot, both methods are utilized but whatever method used it usually isn't worth it to lower the engine efficiency further yet in comparison to pre DPF egr only to have less soot going through the engine, it'd make fuel economy worse for the tests that manufacturers are subjected to and the reduced soot wouldn't matter to the manufacturer anyways because by the time the car becomes old enough for that to matter the manufacturers interest for the car is long gone.
@@nesmio7378 That makes sense. Appreciate you sharing your thoughts
Thank you for this video! Christian
You're welcome 🙂🙂
I truly believe that the soot or carbon black or whatever you want to call it that the engine produce that ends up in the oil actually adds to the longevity of the engine
Rafe great video. However it would be needed to stressed out that soot aglomerating in crankcase is heavily impacting viscosity increase. Worse fuel -> higher impact on viscosity because more sooty residues.
Great point - I probably should have addressed that in this video. It's something I cover in a separate video on Diesel engine oil analysis but it probably should also be in the soot video. Good pickup!
something I noticed from my own stupidity,
i once used olive oil as a lubricant for my firearm due to not having anything else. it strangely formed a thick and sludgy feeling varnish goop over the next few weeks. I believe what happened was a few reactions, mainly the lanolin content of the olive oil was acting like linseed oil and polimerizing. I think however since oilive oil doesnt make the same goo on other stuff, there was nitration and accelerated oxidation occuring due to the unburnt power which is basically nitro cellulose, either by donating nitro groups to double bonds and/or facilitating atmospheric bonding of oxygen which then formed much longer chains through epoxide radicle moa. i think the fatty acids may have also broken down to some glycerin which would have also facilitated polymer formation due to ester formation from local acid production from nitro compound hydrolysis. idk, just coz its a baretta doesnt mean u should use olive oil to lube. funny story but maybe relevant with increased engine temps now days making more nitro groups pre cat and bio disel mfg/consumers dont seem to care about the lanolin content of the base oils. obviously unsaturated is bad but i think the location of the double bonds is very important to their oxidative stability and potential varnish/sludge/polymer formation. thanks for uploading
Just like putting vegetable oil in a metal fuel tank it will polymerize equals a thick hard waxy gel that you have to scrape off with a screwdriver nothing will dissolve it nothing will clean it maybe pressure wash it off there is a reaction between certain oils and metals especially galvanized with vegetable oil
@@tonydiesel3444 oh for sure. metals are used in many different chemistry reactions since their regular crystal surface allows organic compounds to align in conducive ways for otherwise difficult reactions. I also think their ability to conduct electricity has some kind of quantum mechanical stabilization of otherwise high energy transition states and allows electrons to get to places that would otherwise be difficult to react with.
yeah platinum and other similar metals in catalytic converters are what most people think of but actually these metals are just chosen for their durability in such conditions, while many other types of metals produce similar results.
my favorite example of this is a "hydrogenation" reaction where essentially a double bond is converted to a single bond and the carbon area is said to be saturated now. Specifically in the conversion of sue dow fedren to mef amfed amine via the "shake a bake" method. this uses the lithium metal sheets from inside those 1 time use lithium energizer batteries as the catalytic surface, while it simultaneously dissolves in the same reaction vessel (usually a 2l soda bottle) to produce the hydrogen gas and also the hydroxide ions used in the previous elimination step.
there is another reaction ive read where you can convert i think methanol to formaldehyde by repeatedly dropping in the same red hot copper sheet metal.
Thank you Rafe for the interpretation of soot formation Another Great video
Thanks for listening Alex!
hi, can you make a video or thoughts about diesel engine oil being used in modified moped in asian countries? thanks!
Do soot formation damage petrol engines?
What about gasoline does it have any of this.
Whats the difference in gasoline and diesel pollution from the vehicles.
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