[manolis]

Originally Posted by pneumatic

By changing the phase you also change the relationship between the intake and exhaust port timing. But the problem with having them out of phase is vibration.

And added a few gears on looks fine in a concept 3D model, but once you added bearings and other items to support it all then the concept starts to look not so simple.

Pneumatic

The Junkers-PRE engine is an absolutely balanced engine as regards inertia forces and moments. If in this completely balanced engine the phase of the crankshafts is changed a little, the vibration will still be less than in a conventional having the same number of pistons. The ability of the Junkers-PRE to change the compression ratio is nothing important compared to its rest advantages. It was mentioned as it is in fashion these days and it is easily achieved with PRE.

The synchronizing gears is not a big deal.
Using the PRE for a motorcycle it would be necessary a gear primary transmission. Doesn’t the Yayabusa have a primary transmission with gears? In the PRE this necessary primary transmission is also the synchronization equipment.
So, what is the added complication?

Thanks
Manolis Pattakos