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the difference isn't due to the cycles, it is entirely in the way the load regulators work on the 2 types. as far as engines themselves go, for example your car has a 4cycle motor, they both rev up pretty quickly. the primary reason that GE doesn't load up as quick is that GE doesn't want it to. among reasons GE doesn't want their's to load so quick is that the turbocharger on a GE is entirely driven by exhaust gases (EMD's is mechanically driven until notch 6) and if you load it before the turbo "catches up" you get a ton of smoke, (of course GE's are smokey anyway). also GE's wheelslip system works different than EMD's, and this restrict's their loading speed also. as for the AC6000's and 90MAC's they both have software in the computer that limits how quick they load, although the EMD is still quicker loading, it is not as fast as older EMD's, and the GE is somewhat faster than older GE's. as a little side note, when running the AC6000's, in the cab the engine has a very wierd sound, kind'of a howling or something, in throttles 2,3,4 and then it goes away. Still haven't figured out what is making that sound. the EMD's are so quiet with that isolated cab, you can hardly even hear the engine, unless the windows are open, but you do "feel" it, a real low throbbing sound, they sound powerful. hope some of this answers your question. <br />
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