Is it just me, or does this seem backwards? - Ford Powerstroke Diesel Forum

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post #1 of 18 Old 04-26-2011, 03:23 PM Thread Starter
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Is it just me, or does this seem backwards?

The engine designers confuse me. So the diesels come with intercoolers to condense air to put more oxygen in the cylinder. Awesome! But then they put this big, heavy, ugly egr on the engine. Now correct me if im wrong but the egr's only purpose is to circulate exhaust back throught the intake. This is to reduce the oxygen content by taking up space that would otherwise be filled with oxygen rich air. With less oxygen the cylinder temp is lowered to avoid producing NOx (which happens around 1,250 F) to pass emissions.

Now tell me doesnt this sound counter productive??? I have a simple solution, for roughly the same cost manufacturers could install a factory water- methanol injection system that would do the same thing, increase power, and not clog your intake with soot.

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post #2 of 18 Old 04-26-2011, 03:32 PM
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off topic but i saw in your sig 65 f100 diesel swap, got any pics?


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post #3 of 18 Old 04-26-2011, 04:01 PM
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Americanmade89,you should pick up the May 2011 Diesel power mag it has a section in it that says "Water injection VS,Intercooler" Both can reduce EGT,But which is right for you?

Man ,they show one Pic,where they spray water Directly into the Turbocharger, :~0 it says this can lead to pooling and possible corrosion,so it's mostly reserved for competition -only vehicles...pretty cool I think :~)

That Mag also has a section on the 6.7 Getting the Full deletes, they say that EGR weighed 25 Lbs and really exposed the passengers side vaule cover when they removed it...

its a good read :~)
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post #4 of 18 Old 04-26-2011, 04:31 PM
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when it has to do with emmissions regulations all common sence goes out the window! its kinda like burning fuel to clean out the DPF or the cash for clunkers program. if it has the label "green" on it, it probly dosent make common sence.

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post #5 of 18 Old 04-26-2011, 04:55 PM
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The EGR's job is not to re-route exhaust gases into the intake. The EGR's job is to reduce emissions. Routing exhaust gases into the intake is how it accomplishes that. I'm sure when/if the auto industry finds a more efficient way to reduce emissions that they will give it a go!
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post #6 of 18 Old 04-26-2011, 05:19 PM Thread Starter
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Originally Posted by campbellflage View Post
off topic but i saw in your sig 65 f100 diesel swap, got any pics?
No sorry man, its back in Illinois and I'm in California till December on active duty. Once December rolls around and I EAS I'll be sure to post some pics of it. But to fill you in, I'm currently doin a frame off resto on it and it will be recieving a 12v cummins 6bt with a zf 6 speed manual. Debating on hydralic steering, or leavin it manual

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post #7 of 18 Old 04-26-2011, 05:26 PM
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The turbo and CAC isn't for extra or more oxygen into the chamber for combustion. The turbo and CAC is to put more "air" into the chamber for cooling and a cleaner combustion. The EGR idea isn't a positive thing for engineers, it's just one way of meeting EPA requirements. They didn't add EGR for power or efficiency.

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post #8 of 18 Old 04-26-2011, 05:35 PM Thread Starter
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Lead Foot, Definatly a great read, and actually what started my rant! I love Diesel Power

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when it has to do with emmissions regulations all common sence goes out the window! its kinda like burning fuel to clean out the DPF or the cash for clunkers program. if it has the label "green" on it, it probly dosent make common sence.
Totally agree with you, I hope here in a couple years they figure out the learning curve just like gas motors had to back in the '70s. But really the tech is already there with PCCI, and individual hydralicaly operated valves, cummins even has a concept to recapture lost heat energy. Thermal effeciency will be the key to future engine designs

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The EGR's job is not to re-route exhaust gases into the intake. The EGR's job is to reduce emissions. Routing exhaust gases into the intake is how it accomplishes that. I'm sure when/if the auto industry finds a more efficient way to reduce emissions that they will give it a go!
I understand EGR's job is NOx reduction, but I'm just saying I think water meth could do it more efficiently for roughly the same cost to the manufaturer. All egr does is help reduce cylinder temp, which is exactly what water meth does without all the soot in your intake

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post #9 of 18 Old 04-26-2011, 05:51 PM
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EGR doesn't reduce cylinder temp, it actually raises it by recirculating spent gases. It's all there to insure a cleaner burning exhaust by double burning partial exhaust gas.

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post #10 of 18 Old 04-26-2011, 05:56 PM
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EGR does indeed lower cylinder temps....that is the whole point of it. Lower cylinder temps, lower NOX....

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