> Thanks for the detailed response. Thank you for thanking me. :-)
> the exhaust gas would be intruduced into the inside of the air filter The big problem that jumps out at me is that you are adding mass... The carb doesn't know it isn't reg'ler air. Thus the carb will introduce fuel based on the mass of gas passing through the venturi. This will make it richer than stoic. If you had EFI then maybe the closed-loop mode could 'make it right'. > Since there is no EFI system, no immediate mixture setting changes at the carb will happen. Welll... Not mixture SETTING(?) but the mixture produced will be too rich. > The intakes gases/fuel mix should remain pretty much unchanged That statement is wrong by my reckoning, whatever that's worth. > should effectively richen by virtue of the reduced concentration of O2 in the > intake gases, but unchanged fuel delivery. Uh, yeah! That's what I think too. > Or would it be better to do it the GM way, introduce the exhaust gas after the throttle plate? By my limited observations, everybody introduces it after the carb, typically to the intake manifold or a carb base plate thingee. > Then it would maintain the air/fuel mixture (as you say), Yes. > but mostly reduce the effective power output without also richening the mixture. Yes. > I kind of think enrichening it some might be a good thing if this is to happen at high energy (near or already pinging) combustion chamber conditions. Why? If the EGR takes care of it, why waste fuel? > Or am I just going to make alot of unnecessary soot (some if it on the intake side of my throttle plate)? The only problem I have seen is when your engine gets tired, and un-burned volatiles go out the exhaust. The portion of them that gets sucked into the EGR system are cooled, and precipitate out in the passage where the cooling takes place. Plugs em up. Seen this in several engines. My Zuke, and some Chrysler/Dodge products, disremember what else. > Is it possible that HOT exhaust gasses introduced right after the carb might actually ignite the air/fuel stream Ooooooo! That would hurt! I imagine engines with EGR cool it enough not to worry. Intuitively I think there would be small risk, but I'm not sure. > Should the gasses be routed through a cooling tube, maybe 1/2 or 3/4 inch x 4 or 5 feet long before entering the intake manifold? Maybe that would work. Maybe wrap it around the intake for fuel atomization, de-icing and cooling. My $0.02. You unnerstan we are just having this conversation, I'm not advising or suggesting. Diviner of obscure knowledge, in Fresno, GeoB
