Yes they probably do know, lol

I just wondered how it compared to the 137mm for the 1.6 engine which gives a 1.68 rod ratio with the 81.4mm crank
I know the extra capacity comes from the piston size going up from 79-80 and the crank from 81.4 to 83.5.
But I was wondering if they used the same rod and just moved the piston pin higher, or if they kept the piston pin at the same height and shortened the rod by 1.05mm