Quote:
Originally Posted by NESW20
you can't actually (in most cases) just put longer rods in. the pistons would hit the cylinder head. i'm mostly talking about when the block was engineered. they make the block a little bit taller, put longer rods in, and leave the stroke/bore/CR/etc all the same. apparently the "ideal" ratio is 2:1 or thereabouts.
there would be no change in the amount of intake charge let into the cylinder on the intake stroke. it would not be compressed any more or less, only at a slightly different rate at a slightly different time. it could be the difference between running 17 degrees of timing safely and running 20 degrees of timing safely (just throwing out numbers).
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OK... I absolutely see this, but the original comment was about fitting few-millimeter longer rods into an engine, not a from-scratch engine design.
I still don't see how longer than stock rods could help - maybe rods and a spacer? But still, seems like a low-impact, high-effort mod.