why lean is bad

[chris91LX]

Yeah, what he said. An example would be if you have a camp fire or a fire in the fireplace, when you blow air into it like with a bellows you can see the flames gow more intense. Or if your familiar with a steel foundry, there is molten iron in a huge furnace and they stick a big air hose into the metal and turn it on, and flames come shooting out of the portals like crazy. Foundry guys call it "opening the gates of hell". That's not something you want to do inside an internal combustion engine. Adding fuel and air at the same time maintains a more stable burn temp. Too much fuel actually will not burn. If you have a bucket of gasoline and throw a match in it, the match will actually be put out in the liquid. However empty the bucket, just leaving the sides of the bucket wet, let it sit for a minute and throw a match and you better run. Its the fumes that burn not the liquid, which is why you are adding air and fuel, instead of just fuel to a combustion process. Damn, I'll shut up now, how's that for a $10 answer to a $5 question.