You can't say that static compression ratio and IVC matter to detonation in one breath, and then say Dynamic Compression ratio doesn't mean ZIP in the next... since obviously the two biggest parameters to dynamic compression ratio ARE static compression ratio and IVC! You can try and spin what you said and what you meant anyway you want. In the end you can't un-tie SCR, DCR, and IVC from interacting.

No one said Dynamic Compression ratio was the ONLY build parameter that effects octane requirements either. But its a useful guideline just like everything else we use to try and build better motors.

One CSA of a head won't tell you peak RPM. One .050" duration number won't tell you peak RPM. One quench number won't guaranty detonation free operation. Yet we still use them as useful tools and guidance to build better motors.

At any rate... while dynamic compression ratio might not be the end all be all to tell you what octane you'd need... it's a HELL of a lot better then just saying you can only go to 10:1 and ignoring the cam.