Quote:
Originally Posted by Old Tele man
I was alluding to the fact that with the engine computer controlling the turbo waste-gate dumping of 'excess' air pressure, the engine effectively becomes a quasi-variable compression ratio device, and where "suitable grade" meant the octane value of different fuels.
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Indeed. But anyway, direct injection does increase the ability of an engine to avoid knocking while using lower-octane fuel with higher compression.