Post #45.
' Larger air bleed starts the mains sooner '. Nope. When RB quoted the info from post #41 into his post #45, he got it wrong. What post #41 said: ' With more air coming in the bleed...'.
A vital but important distinction. What causes 'more air' to come through the [
air ] bleed? More depression [ suction ] in the venturi.......which is created by an increase in air speed....which is created by the engine rpm increasing. It should be obvious that if the AB is made smaller, less engine rpm is needed to overcome the loss of signal to the booster. A smaller AB starts the system sooner....
Do you guys really think increasing the AB from 0.030" to 0.032" [ 7% more ] is going to make some huge difference in how the fuel is lifted to the booster? It sure will affect when the system starts.
Claiming the quote from Taylor in post #22 'confirms' that a larger MAB size starts the main system earlier is reading something that isn't there. It says nothing of the sort.
There is no mention of AB sizing in Philip Smith's book.
And once again....
' The function of the air bleed is not solely to emulsify fuel. It also exerts control over fuel flow by " bleeding off" some of the suction force or fuel metering signal that is developed at the discharge nozzle. ....As the air bleed is enlarged, the vacuum reqd to initiate fuel flow is increased. Conversely a reduction in air bleed size reduces vacuum signal requirements & fuel flow is more easily initiated'