I'm looking for some clarification before I try and rig up EGR to my LA/magnum hybrid.

Does the stock EGR on my '84 318 only take exhaust from the driver's side bank and flow it into the driver's side plenum on the intake manfold leaving the passenger bank out of the egr loop completely?

Is the crossover port on the passenger side of the manifold only for heating the choke coil?

 

The passage connects both heads.

 

What about magnums? Isnt the EGR tube on the passenger exhaust manifold?

I'm wondering if I can drill the drivers side exhaust manifold for EGR and run that to my valve sitting on an adapter plate.

 

My bad. What kind of emissions testing do you have to have? Why mess with a functional EGR?

 

Checking the EGR is part inspections here but I'd also like the benefits of having EGR; lower NO2 emissions, cooler combustion temps/fuel economy etc. If I can get it working without throwing a ton of money at it, I think it's worth doing.

I guess what I'm really after is some speculation on how effective the EGR system would be if I tapped the exhaust from one of the older LA style exhaust manifolds to the stock older style EGR valve/manifold. My understanding is the magnum engines like the one I pulled my heads from ditched the smog pump in favor of pulse style A.I.R. and replaced the crossover EGR for a tube running from passenger exhaust manifold. If that's true and the magnums only used exhaust from one bank then I should be able to do the same thing provided the pulse A.I.R. isnt critical??? I'd only get reduced NO emissions out of that one bank but cooler combustion temps in both heads. Maybe magnum engines with FI burned clean enough the engineers were less interested in reducing NO than the benefit of cooler combustion temps? I dunno I'm just guessing here.

 

I'm assuming you'll be running the air pump to pass theinspection then?Something I wonder about is fact that the the AIR tubes dilute the exhaust gasses somewhat in the manifolds,whereas the old style EGR got it's gasses upstream. Wonder if it would lean the mix too much? EGR does knock the heat off the flame front,reducing Nox. And reduces cubic inches by replacing mix with inert gas,hence the mpg improvement. Since air isn't an inert gas, seems you'd have to add fuel tomaintain the sameair/fuel mix if the ex. stream is diluted with excess air.Since it's a miniscule amount of ex. gas added by the EGRpercentage wise,be like a vacuum leak more or less? Can't remember enough about the Magnum setup to know the intricacies and differencesof the system. Got out of the auto mech. business in the early 90s.

The air injection is to help fire the catalytic converter on late vehicles, helped burn unspent fuel in the manifolds on earlier ones.Seems the air could be introduced any where upstream of the cat. How about cutting one side of the air inj. tube and getting your ex. gas off the back of the left manifold,letting the pump inj. the air on the pass side? Or running the left AIR tube to the pipe a few inches below the manifold? The OEMs went through alot of different ways of inj. air over the years,from individual ports in the heads to squirting it directly into the cat. I'd think all you'd need is an undiluted source of ex. gas, the crossover in the heads primary function was to promote faster/better atomization of the fuel. Was only tied in to two ex. ports,handy source of undiluted ex. gas. Dry intake systems made the crossoveruneccessary.

Hell, now you got me wondering.

 

for no reason at all, anyone have any idea how many CFM the air pump is pumping?

 

You make a great point about the air injection possibly creating a lean condition... I hadnt thought about that at all. I hate to admit this but I was kinda planning on cheating with the smog pump initially anyway so at least as far as the EGR is concerned things might work. The magnum heads dont have the holes below the exhaust ports where the air from the manifolds injects to like my old LA heads did. I was going to drop the smog pump belt until inspection time and hope they dont notice air blowing out of the manifolds. Like you said though I might be able to route the air closer to the cat and keep the smog pump functional.

I'll have to take a look at the manifolds and see how hard that would be. I think the air system inside the manfold is separate from the exhaust. They normally combine inside the LA head exhaust port so I'd need to plug the air holes in the mainfold, because they'll vent out under the hood with my magnum heads otherwise, and drill out the wall separating the exhaust chamber from the air chamber. Could be done.

Thanks for the ideas. Fortunately (kinda) I've got some time to think about this while the MP parts I'm waiting for are on backorder.

 

Hmm no clue. I googled a bit and found this on a Ford forum
Cant speak to the accuracy of that. I'll keep looking.

 

thanks buddy. dont put too much time into it though. i was really just curious