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Power Strokes
7.3 Aftermarket
Heui Injection
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[QUOTE="Charles, post: 1566219, member: 103"] Try some orifice size vs pressure calculations for how much pressure will move 300cc of diesel in 3ms across a 7 x 12 nozzle. The MEUI or any mech pump for that matter work on the principle of a spill port. If the rack is at shutoff, a P7100 just spills 100% of the fuel right back to the fuel rail on each stroke. A de-energized MEUI does the same. The fuel just keeps going into and out of the P&B. When you move the rack and twist the P-pump helix off the shutoff, or when you energize a MEUI, the path to spill fuel back to the rail is cut off and injection commences. In the case of a P-pump, the duration is determined by the point at which the helix again uncovers the spill port and injection ceases as the remaining stroke blows back into the fuel rail. For the MEUI the same thing happens when the solenoid is de-energized. Sizing nozzles to match the cam ramp rate and desired rpm and fuel quantity is mech pump 101. Nothing new. The part that's different, is that we can vary the timing dynamically and instantly vs rpm, boost, EOT...... and the same for pw.... all from our OEM PCM and sensor package. The signal from the IDM might also be gtg right out of the box. Solenoids look way similar and these systems were born at the same time period. And we're gonna call for a lot less than 7ms at idle..... lol [/QUOTE]
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