Well the bottom line is I'm not cooling a "PC" I'm cooling a 1/8th E buggy motor under race conditions. Before the mod to the shroud my motor temps after a 15min main ran between 170/180f after 160/170f but I believe I can do better than that by taking one of
these and removing the nose piece and splitting the rest in half. With this fan bracket I can mount a 40x10mm fan instead of the 30x7mm. The reason I know this will work better is I already have this setup on a Tekno 2200kv motor and it temps at 150/160f after a 15min main.
Here is the Tekno setup on my O'Donnell Z01-Be