Quote:
Originally Posted by old greg
It's not so much the fuel or timing that does it, it's more that different cylinders will reach peak VE at different engine speeds. So lets say when cylinders 1&3 are at peak VE, cylinders 2&4 might only be at 95% of peak. When an engine with EL headers reaches peak VE it is moving more air than it could with UEL headers, but to either side of that peak the UEL headers could be tuned to maintain a fairly steady overall VE where VE with an EL header would taper.
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I guess that's kind of the same thing. With different VEs the averaged fueling and ignition leaves some cylinders under-performing.