Wow, just read through this whole thread. Gave some reps, then realized how old it was. Still it was a good debate and I'm glad I got to read it. It did give me some laughs.

 

This thread is old, but I just couldn't look away from all of the stupidity... let's ignore experiments in real world conditions that will be subjective due to influences that cannot be accounted for.

An engine gains efficiency (we're talking fuel economy here... or the amount of work produced per unit of energy costumed) by reducing waste energy. In an ideal engine, there is no fiction, meaning all energy consumed is converted into work... real life doesn't work that way.

In a real engine, efficiency is lost through friction, through heat, through constriction of the intake, through constriction of the exhaust, through generating the power necessary to keep the battery charged and run the spark and numerous other factors that are difficult to calculate.

The EGR discussed so thoroughly here, reintroduces exhaust air into the air supply of an engine... reducing effective combustion space within the engine, but increasing the amount of work needing to be done by the engine by moving this waste air around and recompressing it. In real world conditions, I cannot say what effect would be caused by removing this recirculation, but it could, theoretically, reduce waste energy expenditures within the engine. The cleaner theoretical burn (higher concentration of combustible material and less waste material simply being moved through the engine as dead weight) of the resulting air mixture would also increase net power output per unit of fuel, especially at lower revs (depending largely upon gear ratios and transmission). At highway cruising speeds, it would then take less gross power generation to keep the truck at cruising speed (due to reduced waste energy), resulting in better fuel economy.

The individuals on here so concerned about emissions (why are you on a thread about 460 cubic inch engines?) are either really drinking the koolaid or lying... adding weight and effort to any process (smog controls to internal combustion engines) reduces the efficiency of that process by increasing gross power requirements for the same net power... these reductions have often been offset by other gains (better computer control and sensors, better transmissions, weight reduction elsewhere, better aerodynamics, etc) and, many times, they are so small as to be unnoticed in real world applications, but they are there, nonetheless. Anyone who argues otherwise... can be rich at any time by explaining how their perpetual motion machine works, we'd all love to buy one.

Honestly, I don't know, nor do I care if the original poster got 0.5 miles to the gallon increase from this experiment, most of the responses to him (I presume) were extremely rude and uncalled for while also displaying extreme arrogance coupled with an unwillingness to read and comprehend the individual's posts.

 

Yeah, it was an old post that truly showed the OP's ignorance in the matter.

EGR is used for one(!) thing only; to reduce NOX emissions. It does that by introducing a relatively inert gas (exhaust gas) into the combustion chamber to displace some of the air/fuel mix. This lowers the combustion chamber temperature to a level below the temps that NOX forms at.

The EGR system is only active while you are cruising down the road at a steady, low load state. When you put your foot into it to accelerate or pull a hill, the EGR valve closes, allowing you to make full power. EGR is also closed at idle and just off-idle for driveability.

Also, I live in the SF Bay Area so all of my smog equipment must stay intact and functioning to pass the EPA mandated inspections. To delete or render inoperative any system means a fail at the test station for me. I do like clean air, too. I remember the '70's and our very dirty air in the bay area that would have been a "Spare The Air" day today.

I will be leaving here when I retire because it's too expensive to live here. Where I'm going doesn't require a smog check but I'll just leave the stuff on. You can never tell when smog testing might become nation-wide and there will be a demand for OBS trucks that will pass smog.

If you want to take your smog equipment off, be my guest because I"m not going to tell you not to. I do recommend not throwing it out, though. You might need it some day. By the way, an air pump takes about a sixth of a horsepower to turn and that EGR valve with its attendant solenoids can't use more than one-half amp to operate. Not much gains to be had by deleting those items, if you ask me.

Just my $0.02 USD worth. YMMV. You don't have to agree with me.

 

New to the sight I have a 95 5.0 f 150 put new egr on engine is it suppose to have vacuum with engine running when you remove green line from egr?

 

only when the engine is higher RPMs when warm, so no you won't/shouldn't see it at idle.

 

I'm in the process of putting aluminum pro comp heads on my 95 F350 7.5 460
And I want to put new headers on I'm wondering if I can still hook up EGR and any other thing that are run off the stock manifold with any basic headers or do I need special headers if so any suggestions.
i don't go through emissions when getting stickerd but I also don't want any lights in my dash on ???
Any help would be appreciated

 

Omg let this stupid thread lay dormant. Stupidity on both sides of this argument is rampant, and it's way too long to salvage. Start another thread.

 

it doesn't sound so stupid to me, i usually get the best info outta opposing views, it seems there are a lot of informed people on this thread that think they have the advice I need!!
i gathered info outta this thread and feel I'm more informed on the predicament I find myself in, so before you call it stupid just think of the stupid people that found knowledge in your stupidity !!!

 

Uhhhhhh........

 

You can't even run the stock EFI intake manifold with aftermarket 460 heads, so I think the EGR is the least of your problems?

 

...unfriggin' believable...

 

Still true 5+ years later. The anti-EPA-reg folks never stop jabbering.

 

As this is off the rails it`s time to close it.