Systems Manual diagram question

[ouizel]

This may be one of those 'Doh!' questions, but I can't for the life of me figure it out.

What do the numbers inside the squares on the Systems Manual represent. At first I thought that they were diameters for the runs of tube or hose, but some are negative numbers (-8, -16) whilse some are integers (1.0) and some are explicitly in inches (1.5").

Help?

[Pappy50]

OK - Since no one else wants to take a crack at it, here is how I am using it. The minus signs all appear to me to be decimal points. A little wierd, but they are all the same shape. Now, what it seems like to me is that some of the numbers are actual diameter of the pipe/hose, and others are the scale size. I don't think you are going to have a fuel injection line of .04", but .040" scales up to .48" and that is a reasonable size for a fuel injection line on a race vehicle. Any other ideas out there?
Pete J.

[Pappy50]

OK - One of the things I love about the internet is that if you get it wrong, someone will always be there to straighten you out. Here is the real skinny on the numbers. They are AN fitting sizes. A good friend of mine pointed this out and it all comes togeather for the whole chart. Apparently when a designation has a "-" in front of it, that should be the tip off. On further research I found that by placing the number following the "-" over 16 you get the hose size. Thus a -8 becomes 8/16 or half inch tube. For those trivia buffs out there AN stands for Army-Navy and was a standard set by the aerospace industry in the 50's in an attempt to standardize pipe fittings for that industry. Now, no more guesses. Pete J.