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Originally Posted by unregistered
unfortunately copper and aluminum don't bond easily (that I'm aware of)
brass tubes are for strength, the modern aluminum tubes have internal dividers or dimples increasing both the surface area and/or turbulence
and aluminum is cheaper
always compromises
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Aluminum is cheaper but is it cheaper to manufacture a all AL heater core? AL seems harder to bond (even AL to AL) than copper to copper or brass to copper. Wonder how they bond the fins to the tubes in all AL heater cores. Interesting about the dimples and dividers.