[killernoodle]

I'll bet you guys didnt consider that standard heatercores already have "turbulators" in them. Notice they are very thin channels and zig zag all the way to the bottom. This promotes turbulence in the channels and exposes more water to copper than a round tube and turbulators will anyday. It also removes the boundary layer. Heatercores are very effecient at removing heat because of the fin design as well. If you notice, the heatercore's fins are not at all solid. In the middle of the unit, the flat fins are stamped into many tiny pins which also increase surface area and turbulence inside the heatercore.

Heatercores are designed to be quite effecient at cooling and heating, and it shows through the overall design of the thing. Why would they do all that nifty stuff to it like making the channels zig-zag and having the fins be pins if it didnt help performance any?