AGCO Automotive Repair Service - Baton Rouge, LA - Detailed Auto Topics - How Does an EGR Valve Work
Read the opening paragraph.
On a gasoline engine, when the temperature of the combustion chamber approaches 2500 degrees Fahrenheit, nitrous oxide emissions increase. The fuel air mixture can also spontaneously combust, causing
valve clatter and damaging the engine.
Allowing a small amount of exhaust gas back into the intake reduces combustion chamber temperature. Regulating the flow of exhaust gas is the job of the EGR system.
What they don't tell you is how this is accomplished or why.
As to the why, they claim Nox is damaging to the atmosphere in that it does not decay back to it's original components there, but attaches to the ozone layer, destroying it. Or some such, IMO, UN-proveable thing. So Nox is bad.
So why is the Nox there in the first place? Let me tell you; cuz the little tiny engines they give us have to work so hard to get our tanks moving. And the little tiny engines are foisted upon us cuz they took away the ability of the bigger engines to get decent gas mileage, by driving the compression ratios into the basement. And they did that cuz they are giving us skunk-pee to burn. And so we burn twice the amount of skunk-pee, to go the same distance, and some oil barons are collecting huge amounts of money from us poor Average-Joe schmucks. And since the Governments collect taxes on all this extra gas that is being sold, They too are receiving a windfall.What? Who are the they, herein referred to? Scientists,engineers, and governments.I might say that all these thets lie to us all the time, but that is a whack-O thing to say.
When we were at 10 cubic inches per pound of chassis weight, back in the 70s, those engines were lazy. They made so much torque, they could accelerate easily at part throttle, to any speed with any gear. So Nox was never even heard of.And those big engines did pretty good on gas.
Today they don't even put big engines in trucks anymore. What do we get? 287 cubers in 5500 pound tanks, and 238s in 5000 pounders; 17 to 21 pounds per cid! These engines work hard. And when the do, look-out here comes the Nox. We can't have that!
And these engines make little to no better fuel economy than the engines of yesteryear. And they are so heavily laden with computer controls that when that little CEL comes on, we panic and run for cover!
What a scam to sell ever more watered-down gas at ever-increasing prices.
And there is almost nothing we can do about it.
Ok so end of that rant.
So how does adding hot exhaust gas to the intake charge decrease the combustion temperature.
Well this exhaust is about 600 to 1000* F. And inside the chamber, the temperature may be 2500*F. So,even tho the exhaust temp seems hot to us mere humans, to the chamber temp, it is only about 1/3 the temp in there. So while it's in there it acts like a heat sponge, soaking up some heat. Heat that could have been used to propel the vehicle. So you see where this is going right? Heat is the only thing driving your vehicle forward. The heat expands the gasses, that push down on the piston, that makes the power that moves the car. And they,(the liars in power), in their infinite wisdom take some away.So we have to burn more gas per mile to heat the atmosphere.Hyup, what a scam.
In effect they are charging us and taxing us to create global warming, which they then charge us and tax us to try and reduce.Hyup, what a scam.
So, If your car is an EGR equipped car, and if you can legally do it; get rid of it. Oh wait,sorry, that won't by itself improve the situation. No, it's like a spider's web; with everything connecting to everything else.
It all starts with compression. The more you have, the more heat you can make in the chamber. And the more the heat in the chamber, the more torque the engine will make.And the more torque that you can deliver to the rear tires, the harder and faster the car will go.
And it works at every throttle setting;not just at WOT.It all starts with running as much compression as the gas will support.
In fact, if you put a little tiny carb on your engine to limit the loading on it, you could theoretically run way more compression than what would be considered normal.Cuz the engine would never be working very hard. And you could tune that little bugger to get 30 mpgUS, or more, with no computer controls nor EFI nor EGR nor any of the low-compression bandaids. And those powerful little buggers would not need big TCs nor race gears.
No they might not win any races, but they don't have to; they are commuter engines. The speed limit is 65, and they can get there on a 100 cfm carb if they had to.And because they would be back to 10 pounds per cid, they would still be pretty peppy.
You might be tempted to call me a whack-O,
But I have used this method to extract 32mpgUS from my 367 in a 3670 pound car and using a 223* cam, and a 2.0 final drive.
And this car still went 106mph @12.9 in the qtr.
So, am I a whack-O? I tell you what, build yourself an 11.3 Scr, 367, and see for yourself. Stop letting the powers-that-be dictate truth. They do not have your best interests in mind. They only want you to be a slave to the system, that they have engineered, to work us into an early grave.
Spending at least one day's after-tax wages on gas every week, and the rest on food and lodging is all part of it.Making your wife work, to support your joint lifestyle ensures complete slavery.We are so busy working to eat, and support all the blood-sucking-vampires above us,that having babies is fast becoming impossible. We are a dying civilization. This continent will soon be barren.
Well except for the muslim take-over.We seem to be making it easy for them.lol. Wait what? I was ranting? really? OK, well sorry about that,lol.
Anyway that's EGR 104.
