This means the 'AFR' with best power curve using the cast iron manifolds may now be different using the headers. One more reason that shooting for a WBO2 reading is a bad idea.
Exactly. What's the AFR? Is it 12.7 -1? Is it that ratio everywhere in the chamber? Its 12-7 -1 but the spark plug has no deposits on it so it must be good and then you hear the unleaded fuels don't colour the plugs story so it must be true! No one ever talks about that and its implications so you're left to assume it must be because the WB tells you it is.
Here's something that Edward F Obert said in Internal Combustion Engines and Air Pollution, page 550. "This ideal picture, however must be adjusted to the fact that the mixture in the spark plug gap is never entirely homogeneous; very rich and very lean portions might be in the gap at the time of ignition."
This should ring a bell: "Its all about Homogenization and Vaporization" I wonder who said that :lol:
Another thing is the drag strip run was made with the engine cold. This is pretty common with dragstrip runs. They never get heat soaked, and in this case it was dead cold.
Very true. I usually leave early and get to the track before it opens the gates so usually the first run is cold as well. What was the differene in ET and MPH?