| ducting design. I've never read it, but it has been expressed to me somewhere along the line, but it basically states that the area of your duct inlet must be at least 2/3rds the area of your heat exchanger's face area. This is due to the fact that when the air enters the duct it will follow the shape of the expanding volume in the duct. As the volume expands, it must give up velocity in order to maintain the same pressure. When the duct inlet is less than 2/3rds of the outlet size, you will create a low pressure region at the heat exchanger's face which will stagnate the flow of air through the core, ultimately reducing the efficiency of your heat exchanger. Now your setup is a special case though - you have attached the back of your duct to the radiator face. Since the radiator has a fan/shroud on the backside of it that is drawing air through it, you aren't going to run into this issue, however, you have compromised the volume of air that will actually flow through that region of the radiator since your inlets are those two small holes with significantly less area than if you had just left it open, and hence, also detriment the flow of air through your oil cooler. It is easier for the air to be drawn through the radiator in all areas except for where you have placed your duct and this will not benefit trying to get more air through your oil cooler. What you could do that would be better is to simply cut off the front of your duct where it tapers down to those two small ports. This will allow the radiator fan's work to more effectively be used for cooling your oil. With this setup you will be able to put air through the cooler even when the car isn't moving, although the oil cooling circuit is closed at idle, so there really is no gain to strapping it to the radiator like that. Not trying to rain on your parade here - looks like you put a good bit of work into it and I am impressed with the quality of the work - I just think you might need to reconsider your design a little bit. Just putting the cooler in a straight duct, unconnected to the radiator would aid in putting more air through the core. You'll also be able to put the core support bracket back in place. :)
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