@alsancle over the years Doble "experts" have "improved" the doble system adding items and removing items. Most cars have been modified to run pressure atomising jets. Not a bad ides in its self however , 1 its not original and 2 it has been done very badly on most cars . With the draft booster varying the air supply, supplying and matching a ballanced fuel delivery was not really possible before electronics which of course they did not have available in the 60s/70s. We intend to return the cars to an historcaly accurate state around 1929.when they had the draft booster and F generator/carburetor uograde by Doble.