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Posted:
Sun Sep 23, 2007 8:29 pmby Vicoor
My orifice plate in my is 2.306" It's hand made so it's not perfect, but it's pretty dang good if you ask me. The sharp edge is not cut you sharp, but I wouldn't want to fall on it.
My question is Generally what kind of flow rate would I be looking at with 12"h2o across a plate this size?
I know there are variables but I was just wanting some round figures 'til I get an actual calibration plate.
Posted:
Sun Sep 23, 2007 9:07 pmby 86rocco
Use the spreadsheet in because your orifice isn't completely sharp, you may find that you have to tweak the Cd a bit.
Posted:
Sun Sep 23, 2007 9:21 pmby bruce
Cd Velocity CFM
0.50 6946.13 201.5
0.51 7085.05 205.5
0.52 7223.98 209.5
0.53 7362.90 213.5
0.54 7501.82 217.6
0.55 7640.74 221.6
0.56 7779.67 225.6
0.57 7918.59 229.7
0.58 8057.51 233.7
0.59 8196.43 237.7
0.60 8335.36 241.8
0.61 8474.28 245.8
0.62 8613.20 249.8
0.63 8752.13 253.8
0.64 8891.05 257.9
0.65 9029.97 261.9
0.66 9168.89 265.9
0.67 9307.82 270.0
0.68 9446.74 274.0
0.69 9585.66 278.0
0.70 9724.58 282.0
0.71 9863.51 286.1
You can see how a small change in the Cd makes a difference in the CFM. Hole quality has a lot to do with your bench accuracy.
Posted:
Sun Sep 23, 2007 10:04 pmby Vicoor
That's exactly what I wanted. I will be getting a calibration plate but in the mean time I just wanted some numbers to look at.
I understand that typically 22RE toyota heads flow around 130cfm and the head I tested was about 56% that puts my bench somewhere just below the middle of the range you listed.
for now that'll have to do
The spreadsheets would be great if I had excel
Thanks guys.
Posted:
Mon Sep 24, 2007 6:10 amby larrycavan
Posted:
Wed Sep 26, 2007 1:29 pmby 49-1183904562
Vicoor;
look at the following link it is for the MS Excel Viewer, Now i have not tried it with an active sheet as all my computers have Excel but it's worth a try and will at minimum allow you to see allot of the work done by Larry and the other members of the forum.
Rick