The hood is actually functioning but it is not sealed. If you looked at my pictures, i replaced the electric wp with a mechanical one. Just fighting for space. thinking of going mechanical clutch fan with a shroud. hopefully that will do it.
I did this with my build and my cooling problems are now solved. I used the fan clutch that's made for a jaguar (forgot the part number but it's been talked about on FABO a couple of times). Clearance is very tight with a big block, maybe a quarter of an inch at best. Had to build a custom fiberglass shroud for my champion radiator. It can be done with simple hand tools, careful measuring, and a little bit of patience. Its important to also make sure that the fan only goes about half way into the shroud, i.e. you want half of the fan sticking out the back of the shroud, and that there is no more than 1" of clearance between the tips of the fan blades and the shroud. When set up correcly the fan, clutch, shroud, and hood seals work perfectly together. My fan clutch is thermostatically controlled to spin at something like 60% of the pulley speed below 200 degrees and spin at 90% of pulley speed when the temperature gets higher. It rarely ever kicks in but when it does the temp drops within about 30 seconds. It's nice to know that my system has that extra bit of cooling capacity when needed.
