Interesting stuff for sure. But the situation in an engine is dynamic.
The 261 has more swept volume than the 262, but it’s compressed into a larger space. The dished piston is responsible for both of these volume increases in the 261. It’s a ratio, not a constant.
Not claiming to be an expert here at all, enjoying the conversation and hoping it’s not construed as an argument.
I see 2 major things here with the increased compression.
Firstly, it allows more complete and therefore productive combustion and more cylinder pressure. Increased cylinder pressure from a faster more complete burn has to play a major role in pressure production. Higher peak pressure, as you state, has to play a role. Similar to theory on longer connecting rods increasing dwell time at TDC and creating more overall power.
Secondly, it’s dynamic. So at 14,000 rpm the swept volume is decreased in both saws and the dynamic compression ratio is reduced. There isn’t enough time to fill the cylinder, so there is only partial charge compression. The 262 has more parasitic loss from the increased compression but can still have better combustion at the higher rpm. I’ve actually not seen much a reduction in rpm from increasing compression in saw in the real world.
You mention forced induction. As you know, the reason static CR is reduced in a forced induction engine is because the effective CR is much higher than the static one. The cylinder starts out filled with more volume under pressure already.
In 4 stroke engines, static CR increase are needed for higher output engines for multiple reasons. One big one that often overlooked in intake valve closing time. You need the higher static CR in order to have enough compression to create power in an under filled cylinder at lower rpm. As rpm rises, there is better volumetric efficiency but also not a fully filled cylinder because of less time. It’s all a balancing act.
