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Old 01-18-11, 11:39 AM   #14
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Originally Posted by bennelson View Post
The downside to this design is that IT JUST ISN'T THAT MUCH SURFACE AREA! A similar design, but with MULTIPLE tubes running through it would be better. For example, a 2" outside pipe with four pipes running inside it. Of course that would also be a little trickier to build, but also have 4 times the heat transfer!
Ben, what you need is an EGR cooler. The one I installed in my engine has some 30-35 small tubes inside:

With some luck you can find a truck-sized EGR cooler at a junkyard. Mine cost about 50 ($70-$80) from a crashed Peugeot 307.
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