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What is the airflow when air is not going through the radiator? Is there an escape route under the car? I wonder if the improvement was from higher temps and not airflow related. It is interesting that this subject of air flow through the engine compartment gets relatively little attention, and yet testing has shown that about 30% of the drag on the front is produced by the air flowing into the engine compartment. The wheels are another 25%. That, they do pay attention to.
Years ago there was a race car called the Shelby Daytona. It had a big opening in the hood behind the radiator, and a partition between it and the engine. All the air that went through the radiator exited out that hole and over the car. The car was not particularly successful, but I thought the cooling concept made sense. I have seen no other car like it on the road. You can see kit cars now at car shows.
Sam
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