Originally Posted by truckernix
I guess if they were running at near full throttle for long periods of time, they would need extra cooling.

That's also true of the big diesels of today. The cooling system has to be able to dissipate approximately 1/3 of the heat the fuel develops as it burns, and a non-turbocharged engine loses almost a third of its energy out the exhaust. The heat simply can't be trapped in the engine long enough for the pistons to absorb the energy and apply it to moving the vehicle. If somebody would just devise a way to trap and use all that energy the cooling system and exhaust throws away, we could go three times as far on a gallon of gas (or diesel, or propane, alcohol, etc.) A turbo grabs some of that exhaust energy and recycles it back into intake manifold pressure, but it's not very efficient, even with an aftercooler in the mix.
Jerry

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