Copper/brass Vs Aluminum In Radiators

while thermal coating benefit's either the piston or the combustion chamber ,yet it tends to do more, if on the piston,too increase piston durability through reducing heat that tends to reduce aluminum strength in the piston deck or top surface area,
and coating the combustion chamber probably results in a bit more efficient burn in the combustion chamber , as more heat energy is at least for a few fractions of a second retained in the expanding combustion gases,and marginally less heat transfer to the heads, valves and coolant can occur, so in theory you get a bit longer pressure pulse above the piston with either option, but with the combustion chamber coating I think you'll benefit the power/tq curve just marginally more, but that piston durability factors probably more critical to longer term engine durability,
as always there's choices and compromises to be thought over and evaluated

 
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