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EGR Expansion Chamber

675 views 3 replies 3 participants last post by  jesseclee 
#1 ·
I do not like the fact that the EGR system heats up my intake manifold.

That said, it just occurred to me, why not use an expansion chamber to cool down the exhaust gases before they enter the plenum.

This might be a stupid idea since I've stayed up much too late for work, and I'm too lazy to look up diffuser equations right now but basically, cooling the EGR gases adiabatically (in other words, by expansion)?

Possibly even rigging up a chamber with fins both on the inside and outside to help it out.

My thoughts are that I want to run the EGR to a chamber, so I can run just silicon tubes to the custom manifold I'm making (or possibly IRTBs). I worry that If i have flexible tubes straight out from the EGR valve that it will be much too hot and burn through the tubes.
 
#2 ·
Do not try and "cool" the EGR gases! Just remove the system and go through the correct paths to eliminate the corresponding CEL. The EGR system is supposed to up the temp of the intake gases to help with fuel conservation and all the other happy hippie stuff.
 
#3 ·
I'm not trying to cool the EGR gases to be super cold, but I wanted to be able to use flexible lines and not heat up the intake as much.

Maybe I just dont understand this, but all the EGR does is provide a source of inert gas into the combustion chamber in order to have the same effect of "making the combustion chamber smaller, lowering gas temperatures through diffusion, while at the same time, slowing the rate of combustion. Wouldn't having the EGR gases heat up the combustible intake gases drive down the thermal efficiency of combustion, and not counter-contributing to the cooling down?

In other words, if you had a compressed tank of CO2 hooked up to the EGR valve, wouldnt that in effect provide the same thing but better since the gases are cooler?
 
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