Quote:
Originally Posted by evilC
Surely, the A/W method is just a system to transfer heat to the external air. Therefore the water rad will be not be bigger than the A/A intercooler. Obviously the A/W intercooler will have to be sized\to ensure the transfer rate is sufficient. When Porsche were forced into A/W intercooling on their 935 there was no drop in power only extra complication and weight. Porsches A/W intercooler was relatively compact and coped with big numbers of ponies.
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It's about delta T between sides of the heat exchanger. The intercooler is cooling 100C+ air with 30-40C water, the heat exchanger up front is cooling 40-50C water with 25C+ air, therefore more surface area is required to get the same kW or heat transfer. But more to your point, you now have two heat exchanger efficiencies to deal with instead of just one.
I'm still leaning towards air/water just spending the extra time now to try and get the numbers to make sense.