Hi, I have a question about one of the engines im looking at for a project. I am linking two cylinders together. One is a cylinder with a pivoting shaft (piston A), the other piston has a cylinder with a fixed axle so it can only move in and out (piston B). To allow piston be to move with the cam, it will have to be attached to a pivot. However, what I am concerned with is, these cylinders have to be "in phase" so they are moving the same speed and are at the same point during the cycle. Im thinking that the difference between the way piston a and piston b are pivoted will mean they will not always be in perfect sync. To achieve this, do I need to fix Piston A so that it has the same straight length of shaft and the same pivoted shaft length? As shown in the diagram below: Please let me know if I have explained it well enough. I basically want the relationship between the cylinder head moving and the cam moving to be exactly the same on Piston A and Piston B, and I think the increased pivoting length will alter this relationship.