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Re: running lean
I've heard that many engine meltdowns are falsely attributed to running lean. The actual cause was detonation which causes the computer to retard the spark timing so much that fuel is still burning when the exh valves open.
Hence really high exh temps leading to valve and head problems.
In which case running lean isn't the problem, detonation is. While a rich mixture will give a cooling effect, going leaner than stoich will result in a lower burn temperature.
My Nissan has a supposedly lean-burn engine (QG18DE), but I haven't been able to monitor exactly what AFR's it runs at.
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