> I have heard on several occasions that a 4 core rad can be less efficient
> than a 3 core as the fourth row is hidden by another core, and by the time
> the air has left the 3rd row it has little capacity (if any) for more
heat.
>
There is still plenty of temperature differential between the radiator fins
and the air to get effective heat transfer. I think the issue might be that
the air flow resistance of a four core might be higher than a three, so that
there is less air to receive the heat. If the airflow is the same through
both radiators, the four core will transfer more heat from the engine
coolant. It won't transfer 33 percent more though for the reason Graham
gave.
Glenn C
1959 TR3A TS31684L [in total frame up restoration]
1960 TR3A TS64803L [driving, but needs work]
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