Flowbench question?

jaf2021 · 09-05-2012, 04:17 PM

was wondering if anybody knows how to convert percentage to cfm? example flowing 50% on a test pressure of 5 on a superflow 110?

Bob Moulton · 09-05-2012, 05:25 PM

What range are you on? It all depends on how many of the upper holes are open. Sounds like you don't have your instructions. I still have mine from when I got it. If you need a copy or I can help you at all, let me know! Bob Moulton bmre1173@verizon.net

Ed Wright · 09-05-2012, 10:16 PM

Should be a simple to use flow chart with the instructions.

Greenlight · 09-08-2012, 02:09 AM

In your example, 50% @ 5" H2O, you would:

1) Check the flow range (based on the rubber stoppers removed).

2) Multiply the flow range by 50%. This is the uncorrected flow at 5" H2O.

3) Multiply the uncorrected flow value by the "temperature correction factor" in the chart. This is the corrected flow value at 5" H2O.

4) To convert the flow to a different depression (i.e. from 5" H2O to 10" H2O):
* Multiple the flow value in step 3 by the square root of 10/5.

So, let's say you where testing an intake port using the 105 cfm flow range and you got a reading of 50% with a 10 degree difference on the thermometers. Your corrected flow at 10" H20 would be:

105 x 0.50 x 0.992 x (10/5)^0.5 = 73.65 cfm @ 10" H20

if you wanted to correct the value to 28" H2O:

105 x 0.50 x 0.992 x (28/5)^.5 = 123.24 cfm @ 28" H2O

Here is a link to a set of instructions in case you don't have them.

http://www.freewebs.com/jawa634/supe...ing%20ocr).pdf

09-05-2012, 04:17 PM	#1
jaf2021 Member Join Date: Oct 2004 Location: selmer,tn Posts: 110 Likes: 13 Liked 5 Times in 5 Posts	Flowbench question? was wondering if anybody knows how to convert percentage to cfm? example flowing 50% on a test pressure of 5 on a superflow 110?

09-05-2012, 05:25 PM	#2
Bob Moulton Junior Member Join Date: Aug 2009 Posts: 52 Likes: 0 Liked 0 Times in 0 Posts	Re: Flowbench question? What range are you on? It all depends on how many of the upper holes are open. Sounds like you don't have your instructions. I still have mine from when I got it. If you need a copy or I can help you at all, let me know! Bob Moulton bmre1173@verizon.net

09-05-2012, 10:16 PM	#3
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 389 Times in 169 Posts	Re: Flowbench question? Should be a simple to use flow chart with the instructions. __________________ Ed Wright 4156 SS/JA

09-08-2012, 02:09 AM	#4
Greenlight Member Join Date: Dec 2004 Posts: 214 Likes: 15 Liked 79 Times in 22 Posts	Re: Flowbench question? In your example, 50% @ 5" H2O, you would: 1) Check the flow range (based on the rubber stoppers removed). 2) Multiply the flow range by 50%. This is the uncorrected flow at 5" H2O. 3) Multiply the uncorrected flow value by the "temperature correction factor" in the chart. This is the corrected flow value at 5" H2O. 4) To convert the flow to a different depression (i.e. from 5" H2O to 10" H2O): * Multiple the flow value in step 3 by the square root of 10/5. So, let's say you where testing an intake port using the 105 cfm flow range and you got a reading of 50% with a 10 degree difference on the thermometers. Your corrected flow at 10" H20 would be: 105 x 0.50 x 0.992 x (10/5)^0.5 = 73.65 cfm @ 10" H20 if you wanted to correct the value to 28" H2O: 105 x 0.50 x 0.992 x (28/5)^.5 = 123.24 cfm @ 28" H2O Here is a link to a set of instructions in case you don't have them. http://www.freewebs.com/jawa634/supe...ing%20ocr).pdf