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Des Aubery wrote: "In most radiators, the airside heat-transfer coefficient dominates heat transfer (80%) & so any change to the water-side only contributes a very small advantage, if any." I'll work on the airflow issues, and thank you for the input. (Are louvered fins useful?) But in...

Thanks, Des. I knew they were thinner, but not that thin! Since I'm told that turbulence in the tubes is important to optimum heat transfer, what do you folks think of dimpled radiator tubes to increase turbulence? Thanks again.

Mike, I will be careful to so instruct my coolant before my next trip. :-) And Pat, the Cord has two inlet pipes to the top of the radiator (from the two sides of the V-8) but just one large outlet (to the input of the water pump) from the bottom tank. The owner of my Cord 50 years ago thought...

Why would that be? If the top tank is full of water, and the floor of the tank is larger than the top of the core, would not water have to flow thru all the tubes? (Assuming uniform states of cleanliness.) Just askin'.

Interesting point, Fabrico. If the fins at the three-inch-deep point of core depth have warmed to a temp equilibrium with the water coming down, the rearmost inch might not be "doing its job". Is that what you're suggsting?

Yes, IRstuff, the Cord always ran warm at low speeds. No pressure on the radiator originally, altho I do run a 4-pound pressure cap on it now. The car was intended as a high speed (for those days) touring sedan. (Cords held the AAA-certified American stock car speed record at 107.66mph for 17...

Thanks, guys. But my friends and I have been fooling with (and driving) our Cords for many decades. We keep the rad clean, use Water Wetter, and add little electric fans. My question still, if anyone can answer, relates to the core thickness. 4" is pretty thick, and the Harrison engineers back...

The issue is the radiator in an antique automobile (1936 Cord). The size of the core is restricted by the grille shape, and air inflow is restricted by the hood shape. The original engineers opted for a 4" thick core to try to provide sufficient cooling capacity. The car runs fine in 90% of...