Interesting idea. How do you plan to seal the exhaust from the crankcase, and vice-versa? An added bottom ring would seem an easy solution, if there is room. This may open a whole new can of worms though...
red92
Logic would indicate that you don't leave the ice on the intake during a pass, therefore, NickE hit it on the head...your friend is merely trying to cool the intake system to a degree and prevent heat soaking. It is effective, but there are many variables involved. Such as...time...
Bill93xj,
Your original question has peaked my interest regarding material selection. I'm quite curious who/what source stated that copper would be the material of choice in an r-134a designed system? I ask this because I work in the QC department of a Tier-1 supplier of heat transfer...