How EGR Systems Work - Automotive Education

In this video I explain what EGR is, what it is meant to do, and how it achieves this goal.

[@cliveradvan3414]

All these years i was to believe the recirculated exhaust gas was to burn off any unburnt fuel. Clearly not the case. Thanks for explaining this so well.

[@samuelberaha8284]

I thought exactly the same

[@PadmaDorjee]

Fantastic explanation, thank you.

[@khanshamim38]

Subtitle pls

[@PNWFreeRoam]

Great video. Very concise, well lit, well presented and easy to understand. Thank you sir. I gave it a like and subscirbed.

[@723lion]

These are real world explanation from a real mechanics. Thank you.

[@bradgreen987]

EGR delete a must. A pro tuner will discard this item first. Next, TGV delete. Then remove catalytic converters and mufflers, now we're talking. The carbon buildup unacceptable. Where is your AOS? Blowby kills anyone

[@MeaHeaR]

I like this guy, great explanation, sincere effort, straight to the point, no stupid loud musical long intro, Excellenté, keep upp the great work siré 👍👍👍👍👏👏👏

[@ErwinMaragat]

I don't think that the exhaust gas help to lower the temp inside combustion chamber ...

[@stopthephilosophicalzombie9017]

What are the primary differences between EGR's for diesel and gas engines?

[@Fazins]

So where does the coolant system come into play when people say you could have a bad egr cooler if you are losing coolant?

[@hg2.]

Doesn't EGR reduce the power, efficiency, and the whole point of the engine?

[@ittakir]

EGR improves efficiency but degrades output power. But most of the time you don't drive with wide open throttle. You are cruising with mild engine load.

[@hg2.]

@@ittakir They are stupid for rural drivers. They should not be forced to live by the same emissions standards as Los Angeles.

[@shoveI]

No. EGR is not functional at WOT and cannot affect peak power regardless. At less than WOT it increases efficiency. This is because under vacuum (less than WOT) your effective compression ratio goes way down. The cylinder is still moving the same distance but there's less air to compress, so the net compression is greatly reduced. That makes the engine much less efficient for the same reason low compression, naturally aspirated engines are inefficient. EGR puts some inert (no oxygen) gas into intake manifold while it's under high vacuum so that the cylinders have something to compress without changing the AFR, that increases throttle response and engine efficiency at part throttle, effectively simulating a variable compression ratio engine. It's crazy how many people think EGR harms performance.

[@waldolemmer]

​@@shoveIThanks for this information. I was considering doing an EGR delete, but I've changed my mind

[@TomCooper-w1v]

Great explanation but what about egr cooler?

[@tomryan9616]

Excellent video. Very well explained

[@dennismiller2536]

Good job

[@mohdzaidizaidi8470]

hai from Malaysia... i thing egr system like green diesel engine used... recycle gas from exzos. that mean not all burn when combustion from 4stroke engine... why they not used 2stroke engine???

[@mosessalazar5484]

And gas consumption doubles, good business for petrol company.😅

[@jctyoga]

Excellent lecture!

[@jackxshockz8711]

Can I be logically correct to conclude that a faulty egr valve can lead to overheating? Just asking.

[@stevel.6046]

yes

[@723lion]

yes if it stuck closed and your car too old has no computer to monitor and limit the temp

[@emilywelsh1072]

Thank you so much for this great explanation!

[@tristananderson8451]

Very well done, concise but didn't skim over anything major I don't think. Thank you

[@stevel.6046]

do you know if the egr suction is downstream of the DPF exhaust?

[@michaelnyowir3663]

Please I need more information from you for the egr explanation

[@emadislam9590]

Fantastic explanation, thank you!

[@sophiariveroll622]

Thank you! your explanation helped me a lot

[@tysonstightlines3082]

This should help me. Thanks!

[@DIYAutoHomeschool]

Glad to hear it, thanks for checking out the video.

[@tysonstightlines3082]

DIY Auto Homeschool you’re welcome

[@MrSidiyatejas]

You doing really great sir.

[@Sncedayone]

Thanks brother

[@tripp121283]

Thank you. I will be deleting the egr off my duramax.

[@hg2.]

LOL. I was just going to ask, doesn't EGR reduce the power, efficiency, and the whole point of the engine?

[@723lion]

@@hg2. Theoretically yes but that's what the engines are built for, if you really remove the EGR system 1 you won't pass smog 2 your engine gets way too hot and your piston ring gon melt.

[@hg2.]

@@723lion No sense. Diesels worked fine before the dictates if EPA.

[@triestodrum2215]

Very interesting

[@hadireg]

👍👍✔

[@ariellegaspi2044]

Not to reduce,but to double the pollution output.