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Message: [QUOTE="Charles, post: 238704, member: 103"] Do 6oh owners huff paint all day or what? How can we be sitting here in 2012 with a [i]current[/i] thread of this type? I'm sure you can find this same thread sitting somewhere on TDS from a decade ago. No, there's no mystery, nor any need to bench injectors of IDENTICAL displacement in order to see if they are "really" ____ cc injectors. Unless there was a machining error, or a damaged component, they will displace ___ cc evvvvvvvery time if given ample duration to go full stroke. Will a nozzle of larger flowable area displace more fuel than one of smaller flowable area...... well..... MAYBE! Maybe NOT! If you flowed them both at 6,000,000ms of pulsewidth, then NO! If you flowed them both at miniscule injection pressure then you still may see no measurable disparity. But flowing injectors of the same displacement with varying nozzle areas at a duration below that needed to fully stroke the smaller at the given ICP, and then noting that the one with the larger flowable area flowed more is hardly groundbreaking news... Nor does it mean that anyone was mislabeling anything. It's not rocket science. There is displacement, and flowable area. Injector total capacity is determined by the former, the capacity for injection rate by the latter. Thinking that a test as that illustrated in this thread shows that one injector "isn't really ____ cc" is no different than taking the faster one in the test, cutting the pulsewidth in half from what you tested with before, and then proclaiming that it "isn't [i]really[/i] a ____cc injector EITHER" ..... with accompanying gasps and fainting in the crowd when the news is unveiled.... lol. This test is akin to taking two trucks, each producing 500rwhp and then racing them down the highway from a 70mph roll on. One truck weighs 7000lbs and the other weighs 10,000 and loses miserably each time, so we all conclude that the heavier one didn't [i]really[/i] make 500rwhp.... WRONG... The problem was.... you might have wanted a 12 second truck, but instead, asked for one making ____hp. If you want a 12 second truck, ask for one. If you want an injector that displaces ___cc in ___ms, ask for one.... Picking two trucks and running 12's in one and 17's in another that make the same power doesn't mean that the power claims were wrong. If your goal was running 12's, then you simply don't know what to specify. Nozzle size should be determined by the fuel rate you need. The fuel rate you need should be determined by the amount of fuel needed divided by the width (in time) of your injection window. The fuel needed is directly related to the bsfc achieved, and the injection window by the operating rpm and fuel burn rate. With most of these diesels, maybe figure somewhere in the 25* neighborhood for [i]actual[/i] injection window, net of any injector actuation lag. [/QUOTE]