I got you guys talking now, didn't I?
One thing that has become more obvious to me during the latest process is that commenting existing solutions/designs is far more easy than trying to figure the whole thing it out from scratch.
First of all: I am stunned by the quality of the preparations of the simultaneous 5-axis control program and machining of Mossbergs Mekaniska!
I do not know the volume of the combustion chamber in the head. It requires manual grinding to be completed and measured. I put the valves 2-3mm up in the head, not to make the combustion chamber too flat, because that will kill the swirl at TDC. Other than that, I would probably be able to produce synthetic diamonds if not increasing the volume.
As for the cooling passages, I have not experienced any misfit with my cases.
There is one theory saying that you will get a better use of the exhaust pulses, if they are kept as one big pulse and not divided into separate pipes. Maybe large cylinders give away pulses that are strong enough, even if being split into separate pipe, whereas the 450īs might not. I have no experience of my own supporting this theory. Instead I kept the OEM position, to make it possible to fit any after market exhaust system straight on.
Thanks for the cheering! I believe pistons grew once people understood how to design to obtain a good combustion with large diameter pistons. That made it possible fx Ducati 1198 to go to 106mm and reduce stroke but still get the required cylinder volume. I also believe that in order to get a good midrange (4-7k), with only one cylinder you will need some "leverage" to the crank. I think that with 2 cylinders or more, you can keep a fair midrange (and acceleration) with smaller stroke, because the cylinders will cooperate. As for the 450īs, revving is more interesting which requires a smaller stroke not to get obscene piston velocities. But that's only my humble unscientific ideas. I think my new design will work pretty well up to 105mm. Above that you will need even larger valves and lift and ports and-and-and...
To whom it might concern:
If critizing others work gets you off, then fire away! I will not deny you that pleasure!
If you think you are being constructive, you might have opened the hatch 2 months ago!
Now, this is still just a shiny piece of aluminum. There are more work to do before we know what laptimes it can make possible.