Managed to find some time to debug my code.
Below are some graphs from testing it with 1m long rocker, and moment of inertia equivalent to (piston + upper rod) mass, at the 1m radius.
The forces are what the main bearings experience.
If you want to see how your set-up behaves, send me the measurements of your upper con-rod and complete piston masses along with the moment of inertia of the rocker from the CAD drawing.
If you keep the rear piston for balancing, I assume you run it with no rings ? That would seem like a lot of friction from the piston. Has anyone tried Teflon buttons in the skirt to reduce friction ? Has anyone tried a reed valve in the “head” to release pressure ? Those holes in the piston affect balance weight but don’t appear to be enough to eliminate all pressure. The rod big end could be made heavier to keep the engine balanced.
Looking bloody good! Nice fairing too, do you mind if I ask what it is, who supplied it? (749/999 owner here, I need all the aesthetic assistance I can get....)
I always wonder about the weight distribution of Supermono's and this sort of project: wouldn't lopping the horizontal cylinder instead of the vertical give a more centralised mass and better weight transfer under braking/accelration? Does a lower CoG (losing vertical cylinder/head) give a tendency to push the front end as per the ill-fated upside down NSR500:
Our old tarted up Pantah engines also result in a short swingarm and not quite enough forward weight distribution, losing the front cylinder would allow all sorts of options to move the engine forward and lengthen the swingarm. Not easy with our trellis frames, but hey, if you can dream up this sort of beautiful rocker arrangement cutting and shutting a few frame tubes is a 5 minute job!