Modern water injection will break the octane compression rules.
Otherwise my 472 ran the 1/4 to 12.2s on 89 Octane, no ping, because 9.00:1 CR was too low.
You all are safe to design for 9.5:1 - 10.5:1 depending on details. Then 10.5+ higher compr needs a real plan from real experiences.
Revisit water injection to run super high CR on 93 octane pump gas, for high HP.
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