Hey guys n gals, Looking for a little help here. I am looking to build an equal length header for my truck and was wondering how to calculate the losses through the amount of 45, 60, 90 and 180deg bends for 1.5 sch.40 pipe. Now, for clarity, I do NOT mean equal centerline length, thats easy enough. In the picture is an idea of what I am talking about. From right to left the first pipe would seem to have less friction loss than 3 or 4. Explain it all, This curious mind likes to learn :) Thanks in advance.