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Message: [QUOTE="Charles, post: 1566299, member: 103"] I think with the reality that ports don't flow into open air and that there is a piston in the way, as air pumps, the 7.3 and the 12v should move air similarly, cylinder per cylinder. I don't agree that having 2 more cylinders will basically wash out. As bad as the 7.3 flows, it should still outflow a 12v in terms of total air in, per minute at any given rpm by a fair bit more. This is one reason why even at low power outputs, the larger displacement is such a burden in an inducer limited pulling class for instance. The 7.3 needs much larger compressor than the 5.9 for the same compressor efficiency for any given flow and pressure ratio because it moves so much more volume. Look at it in terms of VE. The VE should be very similar between both 2v engines with similar valve sizes and port flows but one of them displaces 5.9L and the other 7.3L. Stock, the units move 400cc I think. I haven't taken one apart but they make 1650ft/lbs on only six units on a stock truck meeting full emissions regs. 8 units at that same BSFC is 2200ft/lbs. If they never were capable of more, I don't care. But no OEM maxes out the hardware for a stock OTR engine. I would like to run the stock front cover. Mech pump guys can't just choose which way to spin the pump with an idler in the hpop spot and the mech pump turning "backward" because it would require a custom cam on an already unicorn 8 cylinder pump. I want to see about using the hpop spot as an idler/ aux drive and then a MEUI pump above it running another 7.3 cam gear.... right back to 50% crank with no special gears or covers Yes something would have to limit the roller's freedom of motion or just go flat, or something. Nitrous on a 7.3 changes the burn RATE..... giving you the ability to get an otherwise poorly atomized, slow injection event sped up so much after the fact that it can produce the bmep it never could without the oxidizer. Mech pump 7.3's have proven that the platform can burn fuel in time without the oxidizer if you can simply get it INTO the engine in time. And I don't know that the pumps they are running are achieving the kinds of pressures the MEUI does stock..... and.... they have fixed timing. [/QUOTE]