Nice!
Carlos you are a great source, and go to guy for effective cooling improvements.
Carlos you are a great source, and go to guy for effective cooling improvements.
Nice!
Carlos you are a great source, and go to guy for effective cooling improvements.
Thanks jimmy, i was wondering when you would come and visit us again.
Yea, to say I've been out of the loop for a while would be a massive understatement.
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Back from the dead here for an inquiry. I understand the raised edges should improve the performance of the extractor, but I'm curious if a simple gurney on the leading edge of the stock vents would be beneficial. I have the stock hood vents on order from Tousley and I'm planning on doing some modification for track use. My plan is to completely remove all the grill/slats and add a rounded gurney using the material from the removed cover/flap and a 2-part resin.
Yes a gurney flap would help. The problem is look where the air would be extracted from, mostly above the radiator. It would be more effective if it was able to get the air past the radiator.
So the question I have for you guys with modified hoods (Carlos’ design(s), Tiger racing) or even better, guys with experience or training in aerodynamics, is this: what should the tufts look like on and around an efficient heat extractor?
I see it two ways, and with my lack of aerodynamic knowledge, I can't say which is better or if my hypotheses are even right. Either:
The smooth, low pressure, laminar flow of the boundary layer flowing over the recessed hood vent that "sucks" the pressure from the engine bay is more efficient...
or...
The large hole punched in the air by the gurney, despite the disruption of the smooth, laminar flow of the boundary layer, is more efficient.
The Tiger racing hood has a slight raised lip around the entire border of the recessed vents. Per the information I've followed from Carlos and his conversations with Paul Brown, turbulent flow over this area may not be good for extraction. Hence the 40* louvers added to Carlos' design, similar to Tiger Racing's unit. It's interesting that the Tiger racing hood's leading opening is similar in size to the stock Terminator hood vent opening. All others are narrower. I’m not necessarily concerned about the drag penalty, especially if cooling is improved.
I’m going to try some other designs this weekend: A slotted gurney (drilled holes), a rounded gurney (zero height at the edge, 1/2” to 1” at the center), a ramped face (concave) and a curved face (convex). I’ll try to get my wife to take some video with the iphone.
I suppose the only way to test the cooling improvement is to compare ECT's, but my next track day probably won't be until the beginning of May.
Great work. I'm following with intense interest.
As some of you might recall, after boxing my radiator and putting in a massive oil cooler in the drivers fender, I solved my heat problems... only to create an aerodynamic problem at 160+ (front-end lift). I'm stuck in the 140 mph class (110-168 range) in ORR until that is solved. I'm not wanting to throw money at the problem until I have a reasonable chance that the money will help.
So... I'm hoping that the hood testing will help us arrive at a reasonable solution to reduce front-end lift.