Here's more:Im talking about the quote YOU posted and what Bruce was discussing.
As you love to do, you extrapolate things together so you can claim how smart you are.
Stay on topic for once.
When you listen to a hotrod engine builder who restricts the compression to 185 for pump fuel you are listening to a builder who has poor homogenization. If the Homogenization is poor it means that there are larger distances between droplets which correlates into more heating of the air and less heating of the fuel. It’s the temperature of Oxygen that matters. Oxygen is the starter of combustion NOT the fuel. So when you have poor homogenization you have to reduce the compression pressure to avoid overheating the oxygen and causing it to react too fast and build a detonating pressure.
Hint, if you decrease droplet size you will increase vaporization at all points especially in the zones where its inhibited by the type of compression
That’s what carby sizing does too. The whole intake system is a vital part of the vaporization.
These cranking pressures can definitely be run however you have to have vaporization and homogenization to run them successfully.
Lots of people run higher octane fuel than what they really need to prevent detonation caused by lean burning at the early stages of the burn caused by lack of vaporization
The vaporization level of the fuel at spark time affects the voltage needed to initiate current flow. its called the ionization voltage. the richer the environment is the less voltage needed for ionization. The richness of the environment is related to the homogenization and vaporization thats achieved prior to ignition its got nothing to do with the overall AFR. You can have a really rich 11:1AFR tune that is actually leaner than stoich around the plug at ignition time. That is a very common problem and its mainly caused by carburetor design and fuel separation in the ports and lack of compression pressure and time.