you sir continue to ignite the fire in my soul for engineering , and present it in a way a layman like myself can understand easily. when I get my job with rolls royce (I'm trying to be confident lol ) I will donate and support anyway I can ! :)
Really well balanced and accurate analysis.! and i agree almost completely. My aims are reliability and economy. Combustion using clean air is more efficient as you said and reliability is reliant on the minimum number of components (less moving parts =less to go wrong). The life of engine oil is halved buy those little sooty deposits caused by unclean combustion. with a modern petrol car, i would not touch it. i wouldn't like it, but it is more trouble than it's worth to delete. On a life and death expedition vehicle or 4x4 off roader, throw the egr in the bin, it is a potential problem and nothing more.
But isn't the EGR also finishing/completing combustion on previous partially combusted particles? Or is that happening much? (quick Google search) Like the (0.85%) carbon monoxide, benzene, and nitrous oxide. Hopefully splitting them up more, and adding oxygen more completely. I guess if there isn't much of the previous exhaust added it couldn't do much to the results, but I'll look at your full EGR video soon :D.
EGR is the best way to reduce NOx on diesel, but the cure is worse than the problem. Reduced engine life, reduced fuel efficiency, increased HC emissions, increased maintenance costs, increased engine malfunctions. EGR ok on gas engines as there is no soot to deal with, but EGR has no place on diesels.
Talk about saving the planet, when, because of these antipollution systems the cars life is kind of cut in half, so in return more waste, because more broken cars that are financially unviable to repair and more resources that can be used in other fields.
The most important is: in a gasoline engine both air intake and fuel injection could be variable, ratio controlled to keep optimal lambda value. A Diesel engine requires high increase of pressure for every compression stroke due to necessity of adiabatic increase of temperature - this is a must for self ignition of injected fuel (no ignition spark). This compression without EGR would still leave too much oxygen, so the lambda value would be incorrect when a low amount of fuel is injected. With EGR - lambda could stay closer to optimal conditions - lower temperature of exhaust gases - longer lifetime of valves and turbine. NOx reduction is a kind of side effect, emphasized as a main benefit which is incorrect. My exaggeration as I don't like this emphasizing of eco benefits when an increased lifetime of the engine and turbine is the same importance value.
Less Nox…but more waste in higher maintenance bills, requiring more parts to be made and shipped and installed, using more tools, and transport fuel for everything and probably a net INCREASE in Nox. Perfect example of a false economy.
NOX is primarily at urban pollutant delivered direct to your lungs by traffic . Even if manufacturing emission controls made Nox as you argue its not going to be at streetlevel. If we follow your line of thought we should dump lots of modern kit like turbochargers etc as well.
The best explanation in the whole damn universe
You're smashing it, keep it coming!
best auto channel
you sir continue to ignite the fire in my soul for engineering , and present it in a way a layman like myself can understand easily. when I get my job with rolls royce (I'm trying to be confident lol ) I will donate and support anyway I can ! :)
I never learned in mechanic school how this shit actually works. Well I know now! Hello from Greece!
It’s funny seeing all the comments from folks that didn’t watch the main video
Hello, awesome explanation. Any way you could cover internal EGR systems? It's something that was never really discussed back when I took mechanics.
Really well balanced and accurate analysis.! and i agree almost completely.
My aims are reliability and economy.
Combustion using clean air is more efficient as you said and reliability is reliant on the minimum number of components (less moving parts =less to go wrong). The life of engine oil is halved buy those little sooty deposits caused by unclean combustion.
with a modern petrol car, i would not touch it. i wouldn't like it, but it is more trouble than it's worth to delete.
On a life and death expedition vehicle or 4x4 off roader, throw the egr in the bin, it is a potential problem and nothing more.
But isn't the EGR also finishing/completing combustion on previous partially combusted particles? Or is that happening much? (quick Google search) Like the (0.85%) carbon monoxide, benzene, and nitrous oxide. Hopefully splitting them up more, and adding oxygen more completely. I guess if there isn't much of the previous exhaust added it couldn't do much to the results, but I'll look at your full EGR video soon :D.
EGR is the best way to reduce NOx on diesel, but the cure is worse than the problem. Reduced engine life, reduced fuel efficiency, increased HC emissions, increased maintenance costs, increased engine malfunctions. EGR ok on gas engines as there is no soot to deal with, but EGR has no place on diesels.
Talk about saving the planet, when, because of these antipollution systems the cars life is kind of cut in half, so in return more waste, because more broken cars that are financially unviable to repair and more resources that can be used in other fields.
I think this was meant to be shorts video
The most important is: in a gasoline engine both air intake and fuel injection could be variable, ratio controlled to keep optimal lambda value. A Diesel engine requires high increase of pressure for every compression stroke due to necessity of adiabatic increase of temperature - this is a must for self ignition of injected fuel (no ignition spark). This compression without EGR would still leave too much oxygen, so the lambda value would be incorrect when a low amount of fuel is injected. With EGR - lambda could stay closer to optimal conditions - lower temperature of exhaust gases - longer lifetime of valves and turbine. NOx reduction is a kind of side effect, emphasized as a main benefit which is incorrect. My exaggeration as I don't like this emphasizing of eco benefits when an increased lifetime of the engine and turbine is the same importance value.
Best to delete the mongrel things
Someone didn't watch the video
egr baaaad it break car 🤬🤬🤬/jk
EGGRs should be outlawed
Less Nox…but more waste in higher maintenance bills, requiring more parts to be made and shipped and installed, using more tools, and transport fuel for everything and probably a net INCREASE in Nox. Perfect example of a false economy.
But also increased mpg (when operating correctly) which means less fuel used overall ?
@@conorf8091It makes less power in the process, which might actually lead to a net fuel economy loss, but overall lower emissions.
NOX is primarily at urban pollutant delivered direct to your lungs by traffic . Even if manufacturing emission controls made Nox as you argue its not going to be at streetlevel. If we follow your line of thought we should dump lots of modern kit like turbochargers etc as well.
@@martinwright7367 its not the manufacturing, its the transport between all the extra unnecessary steps added to the supply chain
@@martinwright7367 That makes no sense.