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Ron, 16:1 ratio would be a tough call in an Opel! They like fuel ratios on the order of 12.6-13.2:1 to make any kind of power. I will dial them in to 14.2-14.5 at idle, higher numbers usually create a lean misfire and emissions goes through the roof!
For a turbo car engine on pump gas, anything leaner than 11.8:1 is usually asking for holes in pistons! I have heard severe detonation on the dyno with some cars when they get up to 12.8-13:1 ratios with a turbocharger.
But I realize aviation fuel and aircraft engines are another thing altogether!
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