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Originally Posted by SlaterSpeed
Il second Bills motion of cutting down an old rad (heatercore?) you can still use the triangular tubes etc. it just makes it alot easyer to make and better performing to boot  .
slater.. |
I'll third that.
Don't skip this chopping action: you'll learn a whole lot.
The main advantage is that with a minimal volume of water, you have a huge surface area, which is what Bill is trying to get across.
The other advantage is in the relatively simple construction of the core: corrugated sheets of metal, slapped together and soldered at the ends (essentially). The sheet metal is only as thin as it needs to be.