Small Block Head Flow Chart

Mopar Racers Forum

  1. pittsburghracer

    pittsburghracer Well-Known Member

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    I wish I could open these attachments. What’s so hard to just post up the numbers
     
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    • 70aarcuda

      70aarcuda Master Hoader of SBM FABO Gold Member

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      hang on....lol...dam old people...

      converting from pdf to jpeg
       
      Last edited: Feb 17, 2020
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      • 70aarcuda

        70aarcuda Master Hoader of SBM FABO Gold Member

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        stock intake and exhaust

        eddy intake stock.jpeg

        eddy mag stock  exhaust.jpg
         
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        • 70aarcuda

          70aarcuda Master Hoader of SBM FABO Gold Member

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          ported intake and ported exhaust
          best i can do for tonight....

          eddy ported mag intake.jpg

          eddy ported mag exhaust.jpg
           
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          • 70aarcuda

            70aarcuda Master Hoader of SBM FABO Gold Member

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            my question for the experts....does the Barometer have any effect on the CFM ?.....
             
          • pittsburghracer

            pittsburghracer Well-Known Member

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            Yes if you have a pilot type of flowbench with fluid manometers. That why I built the bench I did. With a fluid manometer you have to do a weather calibration every time you flow a head and guys don’t do it. They will usually just plug a standard number in there.
             
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            • MOPAROFFICIAL

              MOPAROFFICIAL Well-Known Member

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              This.
              For the same reason, I use a digital manometer/processor..it was about 600 bucks, everything is corrected.
               
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              • PRH

                PRH Well-Known Member

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                The key here is.....”pitot style”.

                Not all benches are this style.

                Neither of the benches I’ve had are that style.

                Both of mine are the orifice plate style(like a SuperFlow SF-600), which compare the flow through the head to an orifice of a known flow value.
                (If the orifice is 300cfm, and the inclined manometer reads 50%, you’re flowing 150cfm)
                Since both sides of the orifice are operating with the same baro pressure...... it’s not supposed to impact the results.

                For example, on a high air pressure day, the pressure is trying to push the air through the head...... but that same high pressure is working against the air as its trying get out of the bench.
                The rise or fall in pressure helps one side of the orifice...... and impedes the other side.

                My old SF-110, that I bought new and had for 14 years and did countless tests on.......whenever I used the calibration plate, and let the temperature differential between the two sides of the pumps stabilize at about 30*....... the reading on the manometer was always the same.

                The pitot style bench isn’t comparing to anything, it’s trying gauge what the actual flow of the air is through the flow tube.
                And, in order to know what the flow is...... you need to know what the air density is.
                So, the weather matters.

                5794B54D-1963-48DD-B79A-664972D56B09.jpeg

                I bought this bench new in 2007.
                 
                Last edited: Feb 28, 2020
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                • Hysteric

                  Hysteric Well-Known Member

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                  Very similar to what my 302's flow but with a Ferrea 1.900 from memory. Can you remember what your port volume ended up at?
                   
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