The best explanation in the whole damn universe

You're smashing it, keep it coming!

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 ! :)

best auto channel

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

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.

Hello, awesome explanation. Any way you could cover internal EGR systems? It's something that was never really discussed back when I took mechanics.

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.

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.

I think this was meant to be shorts video

Best to delete the mongrel things

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.