I found this diy flowbench forum a while ago and i am now almost half done assembling my own. Its fairly cheap to build and accurate at measuring heads, carbs or whatever. I spent $160 on mine but i didnt get the motors yet. Im probably going to use used vacume motors from old vacumes so they will be cheap.

The first link is to a copy of an old popular hot rodding mag where thay show you how to make and use a flowbench. You may have to save the pics onto your computer so you can zoom in on it and read it better. http://www.spiritone.com/~eoa/Cars/F...Flow_Bench.htm
This second link is what i believe is the only diy flowbench forum. if you dont understand how something works (most likley the inclined manometer) thereare posts explaining how they work.

http://www.flowdyno.homeip.net:81/default.asp

and check out my flowbench in progress

http://www.flowdyno.homeip.net:81/to...E=&TOPIC_ID=49

 

Funny how things happen: March 2003 'Popular Hot Rodding' mag came in the mail today. A letter in Tech Letters asked for a reprint on these exact articles. All they had was the covers of Sep & Oct 93 issues.