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Message: [QUOTE="djberg, post: 975583, member: 14728"] sorry let me re-state my statement about the cummins engineer. i'm going to pick his brain on the math with trying to figure out how much volume is lost through the spill port. not how these work. sorry for the confusion. so you think you have a leak or not enough hpop? and this may sound like i'm pointing out the obvious but, did you look at the top oring/oil rail orings when you had them out last? oil around the ipr? it is like you say a very small leak. but you have a 2007 and i thought i heard about some of your fellow countrymen making like 1000hp on a stock 05+ hpop? i think i would go buy new rubber for the whole system or at least what you have not replaced lately and see what that does for ya. just found another interesting point. [url]http://www.powerstrokediesel.com/docs/EF_456.pdf[/url] pg 46 Main Injection Step 1 FUEL MANAGEMENT SYSTEM 46 • Pulse width controlled current energizes the open coil, magnetic force moves the spool valve to the open position. • High pressure oil flows past the spool valve into the intensifier piston chamber. • Oil pressure overcomes the intensifier piston spring force and the intensifier starts to move. • Fuel inlet check ball seats due to an increase of fuel pressure under the plunger. •[COLOR="Red"] Fuel pressure starts to build once the plunger passes the fuel spill port of the barrel.[/COLOR] • Force on the nozzle needle begins to build. [/QUOTE]

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