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      09-26-2013, 02:37 PM   #49
mkoesel
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Drives: No BMW for now
Join Date: Jun 2006
Location: Canton, MI

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Swamp, I agree that the S55 block pictures essentially rule out a bore increase from the 84mm of the N55 if the block were using 91mm center like that motor.

Call me stubborn, but I am still skeptical that the claimed bore and stroke (and resulting new I6 architecture) are correct. I am not saying anyone is lying, just waiting for more confirmation.

Also, as I said earlier, 98mm would be the only thing that makes sense given the N74 and existing tooling. If this is all true, prepare for an explosion in big bore and stroker kits from the aftermarket. And for those building classic BMWs with custom power trains, reliable 500hp should be possible N/A from this block.