Offset cilinder
 

This video recently was published and on several forums there is some talk about it

https://youtu.be/gwtZkHoVMso

This technology is not new and I wonder if some RC engine brand did try this.
In the talk on another forum I saw that an offset piston pin can do the same which is easy to implant in an existing engine.

The only disadvantage will be the port timings, it is not mirrored with the stroke down and the stroke up.

Hello Roelof,

I'm curious about this as well.. Does the R/C engine manufacturer ever play around with this?

Cheers.. :)

I have looked into the ignition/combustion and do see an advantage.

Because our engines have a self ignition the moment of TDC is important. With the right offset to get the rod more straight up on de down stroke the TDC moment is when the crank is over the top. Tha means you could set a higher compression w/o the chance to get a backfire also resulting in more torque.

By offset piston pin, you mean the gudgeon pin that connects the piston to the rod? If so, offsetting that doesn't really do anything apart from reducing piston slap when cold AIUI. Useful for 1:1, not so much for our little screamers that rely on pinch.

Offsetting the whole cylinder on the other hand, will probably require a fairly massive re-design of the engine. The intake and exhaust ports will need different timings and probably a different plug as well.

The offset piston pin does have a same result exept one, the press of the combustion is not transferred over the middle of the piston.
As an engine manufacturer it is simple to make some pistons with an offset hole or even a sleeve with an offset, just to give it a try.

Novarossi did this with the Virtus series engines. I don't recall how much the cylinder was offset but it was visible from outside.

My mistake, it was the carburetor that was offset, not the cylinder.

There are many older model airplane engines that offset the cylinder but no other car engines that I am aware of.