The honest answer to why the weights are different for the 3 different lines, I do not know. I could try to BS my way through it, but I don't play that way. Does the weight include shipping/packaging? Granted the difference in weight is about an ounce, and the line OD is probably 1/4" (6mm is the other line OD being used) with and ID of .0625" i cannot come up with a good answer. Bending a line isn't going to add weight either. I could inquire tomorrow and ask a couple of my co-workers if you want me to......
Even with older engines, they are the same length. That is why lines are bent crazy-line. Besides trying to be neat looking for cosmetic purposes, the engine manufacturer is also "using" the extra length up by adding bends. If you look up RE47419 (deere 4255 line, cylinder # 6) it is pretty much a straight shot from pump to injector (looking at the Deere parts picture). Look at cylinder # 1 (RE47414) and how many bend there are. The bends are there some they can "use up" the extra line length.
When we make lines, a horizontal band saw is used and the lengths are typically within a 1/32" of an inch. All our stuff is bend by hand and on some dyno engines, the line transducers are not "in-line", but rather silver soldered onto the line itself.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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