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Message: [QUOTE="Hotrodtractor, post: 100342, member: 25"] Lets just start with one simple concept: Instantaneous Oil Flow (OK so maybe not that simple - LOL) In order for two different injectors that are completely identical in every way other than the injection ratio (intensifier piston to plunger diameter) to flow the same amount of fuel in a given time - they have to have the exact same injection pressure - its the classic flow through an orifice fluid dynamics question. The orifice sizes are the same and the flow rates are the same - so that means the pressures must be the same. In order to get the same injection pressures between the two injectors - you might have to have a higher ICP on one injector than the other - at high ICP conditions this actually means the higher injection ratio injector needs to have the higher ICP than say the hybrid - SAY WHAT??????? Yep thats right - as the oil flow rate through that poppet increases (to take care of the higher injection ratio - it must flow more oil per time in order to flow the same fuel flow rate) the pressure drop across the poppet increases - Let me explain: Suppose I have three injectors - an A-code (7:1), a b-code (6:1), and a hybrid (5:1). Suppose that each injector give me 200cc of fuel in say 2ms. Don't bother asking about the math right now - I don't have time to explain - these are hypothetical numbers and as such should be used as an example. ........... ICP Pressure drop across poppet Injection Pressure A-code 3164. 1200.................................... 13,750 B-code 2891... 600...................................... 13,750 Hybrid 2800..... 50...................................... 13,750 On a side note: I hate the lack of formatting control I have on here.... WTF? It wants to drop all of the spaces that makes this post look nice and clean in my little "table" :mad: [/QUOTE]