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Message: [QUOTE="Morgan@Midwest Diesel & Auto, post: 540380, member: 8143"] A standard 7.3 injector no matter if its an AA or AD etc is 7:1. The 5:1 plunger and barrel is from the large body injectors of a DT 530. There for you get a hybrid from using the b-code plunger and barrel (5:1) in the a-code injector body. You lose some nozzle pressure with the Weaker 5:1 ratio but you can put out more fuel (cc) per-stroke of the plunger and barrel. A 6:1 custom made plunger and barrel is kind of a medium of the two. It will out put more fuel per stroke than the 7:1 but its nozzle pressure is higher than a 5:1. The cc of fuel per 1000 stroke is basically the area of the plunger face mulpilied by the total stroke of plunger. You can physically measure them and get a good accurate reading of what the injector should be able to flow in a perfect situation. IE: the 300cc injectors that I last built measured 327 but actually flowed 318 average. You will have some loss depending on your nozzle size and varies other parasitic factors. In the end when someone rates and injector it typically will not be that exact. Some peoples 300/200 may flow 290 and others flow 310. You stroke them by the length of the intensifier piston. There are numerous ways and combinations and most everyones are a little different. Im no expert but maybe that clarifies to some. Sent while hooked to something, somewhere, with my foot through the floor! [/QUOTE]

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