Quote:
Originally Posted by Diesel911
I do not think so. As soon as the nozzle opens the pressure is relieved on the injector hard lines witch would return to its unexpanded size because the hard line is not a springy as the nozzle spring it will return to its shape fast. Try it with your garden hose and a nozzle with a shutoff.
When shutoff the hose is swollen; when the nozzle is opened the swelling goes away.
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You've only thought about half the event. The event goes as follows:
1) Plunger rises
2) Injector line swells
3) Injector opens
4) Injector line contracts (depending on pressure relief through nozzle)
5) Injector closes
6) Injector line swells
7) Plunger descends
8) Injector line contracts
You made it to step 4.
With higher pop-pressure (more spring tension in the injector body due to thicker shim) the injector closes sooner, thus causing the line to swell and not allow as much fuel in. Keep in mind that even with only 5psi in the line, the line DOES swell, just not very much. Therefore, if you increase the pop pressure, the line has more volume when the injector closes, therefore, because the plunger only pushes a finite volume, the line "absorbs" a greater quantity of the fuel.
Again, this is all completely theoretical and if you really want to find out anything meaningful, dyno testing is probably the best method.