If you have a mixture control and never touch it the result is the same as having the carb wired full rich or having the mixture control completely removed from the carburetor. (The legality of this latter option is questionable).
The Stromberg mixture does function at full throttle, but the effect is reduced as the difference between the pressure in the throat and ambient pressure is much smaller. The C-series Continentals do not have even enough fuel air distribution to support lean of peak operation. The general rule of thumb is to not lean a Stromberg below 5000' density altitude. Above that lean for maximum RPM. Go slightly rich of the peak if you're climbing at full throttle. If there is no increase in RPM then leaning is neither necessary nor beneficial. Anything more than that is, IMHO, over analyzing the situation. John Cooper Skyport Services 518 797-3064 www.skyportservices.net
