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Join Date: Sep 2004
Location: Tonawanda NY
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Quick tuning question, does ignition timing affect afr's?

I'm in the process of tuning my engine finally, I'm curious to know if ignition timing and the air fuel ratios are completely independent of each other or if an adjustment in ignition timing will alter the afr's? Initially my afr's are 15.1@ no load cruise and 10.5 11 ish@1bar, 3k through 6k rpm. THanks
Tom
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud
Old 11-17-2011, 03:10 PM
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yes. higher timing will result in a leaner mixture and lower timing a fatter mixture
Old 11-17-2011, 03:29 PM
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thx. by higher timing you mean more advance?
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud
Old 11-17-2011, 03:55 PM
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Yep, poor timing = poor combustion = sub-optimal AFR's
Old 11-17-2011, 03:56 PM
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