Quote Originally Posted by Martinm210 View Post
Yeah, I'm still not quite sure what to think of the actual wattage numbers. They generally seem low, but all the rads are being tested the same, so relative performance should be ok. I guess insulating the lines and adding the enclosure to minimize heat losses makes a bigger difference than I thought. I always new open air rad testing was a problem if there is any changes in air flow in the area of testing. I am probably also getting a touch of restriction from the test bench ports but I did try one test with and without the top cover and got results that were within a few percent so I don't think there is enough restriction to cause any major differences. I think most of it is in the line insulation work and testing all of the points with heat loads that near a 10C delta.

But you definitely do pay a premium for double thickness rads. It is almost double the materials costs for less than 10% performance benefits. The bigger difference I see with double thickness is generally half the restriction and usually better finishing/quality control. To some that would be worth the extra price, but best value will always be the slim rads.

Still working on the GTX, but I should have those results ready during the week. Almost half way done now and trying to burn through these as fast as I can.
Martinm210 I have been meaning to ask you something about the SR1 560 140mm radiators, does the extra 2 rows of tubes increase flow more than having a thick radiator with taller tubes? I remember a review where you stated the radiators being thicker had more tubing volume (also lower pressure drop) because of that extra thickness. I remember 25 years ago in Oregon riding Honda 125's racing bikes, boy was that fun!