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Message: [QUOTE="Charles, post: 1566285, member: 103"] The beauty is..... it's tied to crank.... So no matter what speed you spin it, the fuel goes in the hole in the same degrees crank for the same cc's of fuel... and you move that window forward in time with the SOI timing with the stock Ford timing table. As for comparing the E7 to the 7.3 on airflow, bare in mind, the E7 isn't running 150lbs of boost. Boost is literally displacement. You ARE moving the air..... not air volume, VE stays constant but air MASS. Each of the cubic feet you move might weigh 4 times what each cubic foot weighs going through the E7 at stock boost. A 12v head flows crap compared to a 7.3, as unbelievable as that sounds.... but at 120 to 150 lbs of boost they will move enough air MASS for 1500+ hp. And that is with crap for injection pressure and 2 LESS INTAKE PORTS, valves, cylinders and injectors. Stockish heads. VE is nice but boost from compounds WILL push the air in the hole. Not MORE air.... the same CFM through the port.... but really HEAVY air. The CFM INTO the first stage compressor however will be dramatically high. Need over 100mm certainly. The flow INTO the first stage will be 2 or 3 Mack engines... Tappet design is a question. Getting the unit pumps to follow the cam at double the design rpm is a real issue. Increased spring pressure, rollers with limits to keep them from going all CP4 sideways..... I have even wondered about going cp3 style with an eccentric. The good news is that we can spin the pumping units far slower.... a cp4 has to fuel the engine from 2 pumping units spinning fast, dual cp4's have 4 total pumping units and dual cp3's have 6.... MEUI 7.3 would have 8. It could deliver the same fuel at lower cam operating speeds. The plunger sizes appear similar. The similarities between a Meui pump and a CR pump are obvious. CR pumps hold 2 or 3 pumping units making 25 - 30k psi, and 4 or 6 units for dual pumps. A MEUI pump on a 7.3 would house 8 pumping units at 25 - 30k psi. But..... you can't drain the rail. The more you ask for, the more violent it gets [/QUOTE]