First of all, it depends on how the cylinders are numbered by the manufacturer. Several factors influence firing order, but in a flat plane 90 degree V8 there are only a few choices. This is one reason this engine design is used in most V8 race car engine designs, but not used in most production cars. Although it is a little less refined as far as vibrations go. That allows for less inertia, higher possible rpm's, and faster acceleration. A flat plane design does not require counterbalance weights on the crankshaft. There are many reasons to use one configuration over another. A cross plane engine, when looking from the end straight on would look more like an X, evenly spaced. First off, a flat plane crankshaft means all journals are on the same plane, so if you looked at it straight on it would have all journals in a line, straight up and down. This is not an easy question to answer, but I will give it a shot.
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