Quote:
Originally Posted by Frank Lee
I'd take the whole exchanger out of the exhaust stream after it has warmed up; no restriction, and that's gotta be an awful tough life for an exchanger that is continuously exposed.
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EGR coolers take that abuse all the time. Actually it's even worse on most diesels the EGR see pre-turbine temperatures which can be a few hundred degrees hotter than post-turbo temps, where I want to put it.
My thinking was to get a really big EGR cooler (like out of Class 8 truck or something). If it's large enough it actually wont cause much more exhaust restriction than a normal exhasut pipe. EGR coolers are also already designed with the goal of having minimal restriction. If I can't get an EGR cooler I could always just expand my exhaust pipe (say 4" up to 5") and then put a copper coil in it. That probably woudn't increase backpressure because the flow area increas (from 4" to 5") would make up for the flow area decrease from the coil.