Hence 420,5 rpm @ 50,6 m/s of the drive wheels (also unrealistically assuming "no slip").
Assuming the stroke also being the diameter of the conrod bolt - peripheral speed of that bolt circle would thus be 14,5 m/s*- right?

Then the piston's varying velocity and direction during the wheel's turn, would need a formula & graph entirely above my pay grade,
assuming that the conrod length, vector analysis etc being established.

*Conrod bolt circle dia: 0,66 m / Wheel dia: 2,3 m X speed: 50,6 = 14,5 m/s