Yes that's the sound of an ages old post being brought to the surface. But I think it's better to continue than create multiple threads.
I'm wondering for those who have done this, have you seen any heating/cooling issues long term, particularly in summer stop-n-go traffic?
Looking at the above grate, it looks like a 60 degree pattern (for any hole, there are six evenly surrounding it). I'm guessing the pattern in the picture is 1/8" holes on 3/16" centers, which has an open area of only about 40%.
If I look at similar protectors for cars, they're around 60+ % open area. 1/4" on 5/16" centers, or 5/16" on 3/8" centers would get to that figure, but the holes are starting to get pretty big, if you could even find that combo.
I'm not a mechanic, and I'm certain the radiator has sufficient cooling while moving, but would moving the plate 1/4" out from the radiator surface allow the fan to be more efficient? I think someone mentioned they did that in another thread. The main concern being warranty issues and overheating.
Wire mesh can easily get upward of 70-80% open area, but would need some kind of frame. Both are available from Amazon.com for under $20 for 12x24" sheets. (search for perforated aluminum or wire mesh). Cheap frames could be made from the "U" stock stained glass folks use.
A grill full of fireflies might make a cool third headlight, but it's a pain to clean.
So, long term reports? Anyone have to give up the home brew design? Of course, summer around here has been so cold, probably don't even need the radiator