I know that I suggested the alu brazing rods. Yes, getting the surface roughened properly and the getting the temperature of the base metal are critical to success.
On second thought - I wouldn't do it this way.
An easier/better way might be to use a standard racing transmission cooler (for Honda) and heat that, eg:
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https://www.autoaccessoriesgarage.co...ion-Cooler-Kit
If you want to heat that, wrap in nichrome wire, and apply power ie:
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2003 Renault Scenic - 30% more power with no loss in fuel economy.
1991 Toyota GT4 - more economical before ST215W engine-swap.
previous: Water-Injected Mitsubishi ~33% improved.
future - probably a Prius
