His Y-axis shows pressure. Velocity is caluclated from pressure. With zero delta between the two, you have no flow (velocity is the measured flow (speed) with direction).GARY C wrote: ↑Sun Jul 22, 2018 3:30 pmI just had a brief conversation with David, this is not data from Clint's equipment, I don't know how it was set up or calculated but he's referencing flow and velocity not pressure.hoffman900 wrote: ↑Sun Jul 22, 2018 3:14 pmVelocity is calculated from differential in pressure (among other things, like density).GARY C wrote: ↑Sun Jul 22, 2018 1:54 pm
Could the confusion be that David is referencing port velocity as opposed to port pressure? I am not a graph guy so it's hard to compare with no ref numbers on your chart but it looks like they are referencing two different things.
I only said what I said because of the conversations I had with David before he contacted Clint and the tests he was involved in with others using TFX equipment.
If you look it up in the book Brad referenced it's dealing with flow procedures and used to show why a fixed 28" is not any where near what is going on in a working engine.
Also, see my post above. Port velocity will almost never be higher than seat velocity. Port velocity will follow seat velocity but be more subdued.