Quote:
Originally posted by winewood
The dimples really shouldn't help at all. I think I can tell ya why. There is no easy way to get water in and out into those holes. Its more of a sight trick. Do this test.. (because its easy) Mill the block without them. Then test it. Get a good base temp. The take it off, and cut the holes in it. I think you should find they are not necessary and no performace gain.
If anything they remove the copper from the hottest part and restrict the heat leaving the die area. Since they can't dissipate the heat easily it actually may hurt. IMHO. <--- (notice the imho disclaimer)
Easy way to prove me wrong there.. you should jump on it. 
|
Clearly it's up to Jaydee if he wishes to do before and after testing of the dimples.
But there is no problem getting water in and out. While it's true they are made with a drill and drill press they are not intended to be holes in any sense. "Dimples" are very shallow depressions in the bases surface made with only the sharply tapered tip of the drill.
And with the dimples surrounding the central pin which is tapered to a point, the water is directed at the dimples from right above and when it hits them just splashes right out, spreading on accross the base and out between other pins.
While the dimples do increase turbulence they also increase surface area for the water stream from the inlet to impact. Both increase cooling.
The roughing mill bit will do the same for thesides of the pins, greatly increase surface area.
While I don't need proofs that the dimples and roughing mill bit will improve performance it would be nice, if Jaydee has the time, to see a before and after in temps.