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Posted:
Fri May 20, 2005 5:08 amby smooth blend
[color=#000000]What technique do you guys use to measure velocity and with what conversion chart?
Does it have to be with a pitot tube? I want to test for boundary layer separation at the short turn radius and amount of drag from the walls.
I can port map with four v-mano
Posted:
Fri May 20, 2005 7:53 amby bruce
What does PT recommend using with their software would be my question?
I use a homemade pitot that works extremely well for velocity testing (this is discussed in another post on here) Use a spreadsheet to log the numbers and you can do what ever math or charting you want with that info then. You can wrap-up some serious testing time getting into port mapping I have found, but thats where the CFM's are found. I also use a wand with thread on the end to "see" what the flow is doing. You can use a single tube probe and get a really good idea of flow velocity but you can't convert it to an actual FPS number. This is how I have done it in the past, I have only started to use the pitot probe for some velocity testing after a member sent me a prototype to try. I have since made my own probe which has a smaller radius to use in my smaller ports.
I'm not one for buying the software since it is so limiting sometimes on how you can use the info, working with numbers in spreadsheets lets you use the data the way you want/need to for your specific program. Course you have to setup the spreadsheet.
It would be interesting to get a "super spreadsheet" made with all the members ideas from this forum? I know most don't want do alot of sharing of secrets though in an open forum . . .
Posted:
Fri May 20, 2005 11:22 pmby 86rocco
I'm the "member" that sent Bruce the pitot tube. They're really quite easy to make, I used a few different sizes of copper and brass tubing, got a little more info.
Posted:
Sun May 22, 2005 5:28 amby smooth blend
[color=#000000]I didn