Roller rockers simulation for a Citroen GS aircooled flat four engine

CAD simulation for roller rockers for a Citroen GS aircooled flat four engine. The standard engine has flat tappets, prone to wear now that the oils has eliminated the Zinc, or ZDDP additive Animation is 3 turns for the camshaft, that is 6 turns or the crankshaft The critical point is the valve overlap, where piston is at TDC, and both valves are partially open. Designed and animated in Autodesk Inventor