But when you say 'better burning' of lean mix, isn't that tantamount to adding in "without detonation?"
Interesting comment about dual timing for those. My experience has to do with the large bore hemispherical head bmw motorcycle motors, which will rapidly self-destruct if run on regular pump gas at specified timing and compression. The standard fix is to simply dual plug and fire both plugs simultaneously. I chose to simply lower the 9.5-1 ratio even lower with a thicker base gasket.
Then there is that too. I recently discovered that the Camry of Fame had a cracked intake snorkel between the mass flow air sensor and the throttle body. It was nearly split half way around. But the efi was keeping the mix within limits so the driveability was fine, except at idle and off-idle. Car drives a bunch better now with all the air going in getting metered.
Jim
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