LOL...when I first tried the burr finish on my junk I just could not stomach what it looked like. In fact, when I tested my W5 junk with the tunnel ram on the flow bench, I lost quite a bit of flow using the burr finish. IIRC it was down 20 CFM over a 60 grit paper roll finish.
Also, IIRC the tunnel ram with the 60 grit finish was much more quiet on the bench. That was 21 years ago and I didn’t keep the notes on that stuff. I kick myself for letting that go with the bench, and I kick myself for getting rid of my flowbench.
I know I played with a burr finish again as I started moving the nozzles up from the valve cover rail. I just couldn’t get my head around that finish and the noise it made on the bench.
I’m going to try and get some pictures that are closer to the finish so I can see how close I am to CS and LM.
Interesting enough, looking at the picture of that tunnel ram by LM, it appears that surface is more divot that a raised burr. I remember getting that look years ago with a much more coarse burr that was bigger in diameter and it was a cylinder shape with a radius on the end so it doesn’t dig ditches.
At times I’m thinking it’s not what the burr finish looks like, just that you run a burr over it. Then again, LM said the rougher the better, and Darin Morgan said you can’t get it too rough which is mind boggling to me.
And now I’ve talked myself back into the corner of indecision...I hate that. I usually trust my gut but this has me baffled. Do I try and make it a bit rougher, or do I say screw it and paper roll it????