Matt Barrow wrote:

And what is the threshold for compression ratio?

Why does my current 7.5:1 CR still need 100LL when my older 8.5:1 did as
well?

Sorry, I must have missed this post over the weekend. Is your current
engine turbocharged? I'm scratching my head trying to come up with a 7.5:1
engine that requires 100LL.

John Galban=====N4BQ (PA28-180)

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