Quote:
Originally Posted by Isaac Zachary
There are a lot of things that can change the picture, and to be honest I'm no expert in them.
At stoichiometric you get pockets that are lean and pockets that are rich. As you lean out you get less rich pockets, therefore less HC. But I suppose at some point you don't get enough heat to burn everything up. Maybe compression ignition would solve that, which it does in a diesel engine.
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Thanks, Isaac, for a great post and explanation. This could very well be what's going on with the HC.