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Message: [QUOTE="BrewTown, post: 1566284, member: 31811"] Seeing that the "pump" camshaft spins at half crank speed, and Charles mentioned 50° of advance (although that seems entirely too much?) that translates into 25° BTDC of crankshaft for camshaft for lobe start. Not taking into account any initial ramp or delay. Is 60% of injection BTDC a decent assumption for lobe design? That puts us at a ramp incline of roughly 42°. Someone with injection pump camshaft knowledge would need to point out my errors in assumption here. Keeping that incline ramp close to that figure should allow the most fuel with the smallest PW while still servicing the full SOI advance. Meaning, it would only be stroking the pump where there's possibility of using the fuel it's pumping. Is there benefit to injecting after 17° past TDC, meaning 34° crankshaft? If that is correct, knowing the unit pumps stroke, and cc's per distance could get us some idea if realistic SOI and PW gets us the volume necessary. My whole concern with that is a unit pump designed for 1800 rpm having enough variability to operate at idle and at whatever RPM the goal is. Pressure and velocity at high RPM the other side of this. The other option that would complicate things, is if the pump cam advanced with RPM. Doing this would do 2 things, increase the lobe lift useable at each RPM (as in steeper camshaft lobe being available sooner at higher RPM, but also later at low rpm if pumped volume is too low in some scenario), and possibly allow an existing cam lobe, like the stock E7 one. Pick this apart. I'd like to learn something... [/QUOTE]

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