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My mate runs a 5 Row copper radiator in his car. Can I run fewer rows in my application with a PWR alloy radiator?

The lighter aluminium is not the only reason for more efficient heat transfer. This is also achieved with the use of larger, wider tubes. This in turn means fewer wider rows. This promotes a larger rate of cooling airflow over the tubes, particularly at low vehicle speeds. This sees greater tube to fin contact, which is essential considering the fins do over 90% of the heat dissipation. So yes, you can use fewer rows with an aluminium radiator.