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Don't know what v6 means, real engines are straight!

v 6 hsa 2 banks of 3 cylinders, with one crankshaft, so it looks like a "V" if you look from the front. Straight 6 has all cylinders in a row (almost twice as long as a v, thats why there's no straight 8s these days).

I think that the "better" come from smoother - something to do with piston/crnak position being better balanced in a straight 6. 4 cylinders are not balanced the same way, and so have extra "balance shafts" to keep everything smooth

If pistons are numbered (1) (2) (3) (4) (5) (6) in a straight 6...

pistons 1 and 6 go up at the same time, and 2 and 4 go up at the some time, etc. thus creating equalibrium, and balancing of the engine as a whole.

V6/8 tend to rock slightly, and to stop this, additional mechanisms are put in place.....

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