Increasing EGR flow for better mileage

[justme1969]

It was a pain sorting through this thread.
EGR diesel and gas need to be separated to study effects and Ideas posted correctly.
This thing is a jumble and often side tracked me into wrong thinking by mixed petrols and oils posts.
Focusing upon just gas since the Diesel world has already whipped the issue fully; it is a question of how much returned gasses and heat and at what timeto reintroduce them.
Im not understanding how a "normal" lean burn vehicle would benefit from vapor that has utilized 97% of its potential energy already with little left to offer except its heat.
I read a post awhile back where a standard engine "not lean burn" was using heated air to create a lean burn. with fuel line heater, intake heaters and reburn system. But !! This was also linked to a potential water injection and possibly hydrogen system.
Making fuel a unstable mix is troublesome, predetonation is not a recomended practice.

[RobertISaar]

EGR isn't used primarily for leaning out the AFR... it's used to cut throttle losses(and reduce NoX), since when EGR is active, you need more throttle to maintain the same amount of output.

[Teemo]

Gasoline engine running at part throttle is equivalent to running it with very low compression. But compression is main factor in Otto cycle efficiency calculation. So in theory Otto cycle engine runs with maximum efficiency at full throttle only. Adding some inert gasses to intake from exhaust should reduce throttling therefore increase efficiency. Although there are definetly some other factors to consider with this.

[Cobb]

With the Insight doing this to reduce the output of the ICE would make more use of assist as its partly related to throttle position and a host of other parameters.

[The_Jed]

Stumbled onto this thread from another EGR thread. I'm planning to eliminate the smog pump on my Lincoln since I view it as little more than parasitic loss. However, after reading a few EGR threads, I may see about plumbing a hose from my H-pipe to my intake; essentially trying to retain an EGR system without the heavy, failure prone smog pump.

I'm not 100% sure, though, I may be misinformed or just plain wrong.

[2000mc]

Jed, afaik your smog pump is going to be independent of the egr system, and you will still have an egr w/ smog pump removed. All smog pumps I am familiar with are air pumps, which pump air into the exhaust stream to help reduce emmisions. The added air helps to burn excessive fuel in the exhaust, especially when the engine is cold, this also helps the converter heat up faster.

[The_Jed]

Ha! Well I guess I was misinformed.
Thanks!

[user removed]

Originally Posted by The_Jed

Stumbled onto this thread from another EGR thread. I'm planning to eliminate the smog pump on my Lincoln since I view it as little more than parasitic loss. However, after reading a few EGR threads, I may see about plumbing a hose from my H-pipe to my intake; essentially trying to retain an EGR system without the heavy, failure prone smog pump.

I'm not 100% sure, though, I may be misinformed or just plain wrong.

I don't think that year had a smog pump. If so it would have air pipes going into each runner of the exhaust manifold. Basically it's a 5.0 Mustang engine and I'm pretty sure Pop's Mk7 had factory tubing exhaust headers with port fuel injection which pretty much eliminated air injection.

regards
mech

[The_Jed]

There's a smog pump. And yes, it has the factory "headers" just like the '86-'95 5.0 Mustang.

[The_Jed]

It has ports on the backside of each head instead of the old tubes into the manifolds they used to put on cars.