I think there is hard data to support the notion that equal lengths for the liquid is appropriate but I know of no such supporting data for equalizing the lengths on the air tubes.

Save the 0.72 oz.  <VBG>

Walter,

 

The question was directed at the extra loops observed in the injector fuel lines.  Perhaps there is a difference since I had a slightly better balance before than now.  Of course, I have cleaned and randomly swapped injectors since then and the entire engine has aged some. 

 

The injector air lines from the air supply plenum are not equal in length. The pitot collector is large enough to supply and maintain the ram pressure in the supply plenum (this was measured by a pressure sensor).  Each line to each injector shroud is large enough to not be a detriment to the minimal amount of air flowing thru the much smaller injector bleed hole at the end of each line.  Here is the picture again: