MAB effect on main circuit

[Right hand drive]

[CDN]

[GTO Geoff]

RHD,
You are still missing the point. And that point was quite clear in the H book & numerous others about how the AB size controls the start of the fuel fuel. How much fuel flows after that is another story. I don't have any argument with the rest of your comment.

The simple fact is that there IS air mixed with the fuel when the MAB size allows the start up of the main system. It is NOT solid fuel.
I suggest you buy John Passini's Weber book, ISBN 9781855207592. He has forgotten more than the rest will ever know. Go to p.32. Where he says this [ in part ]:
'With a further increase in gas speed through the venturi, the depression caused will begin to lift fuel in the well....'

[Right hand drive]

[GTO Geoff]

And nowhere did I say solid/liquid fuel flows. It is a mixture of air + fuel, air from the MAB.

Don't know how many examples are needed to show that MAB size controls WHEN the main system start, but here is another one from Dave Emanuel, Carter Carb books. I do not think all these people can be wrong....

' ..the function of an AB is not to solely emulsify fuel. It also exerts control over fuel flow by "bleeding'' [ italics in original ] off some of the suction force or metering signal.....By varying the size of the AB, the amount of suction [ vacuum] reqd to start fuel flow can be altered. As bleed size is enlarged, the vacuum reqd to initiate flow flow is increased. Conversely a reduction in AB size reduces vacuum signal requirements & fuel flow is more easily initiated.'

[jmarkaudio]

At 2000 RPM you are on the transition circuit. Idle feed and idle air bleed affect this range.

[GTO Geoff]

Did you try a larger IAB?

[Rat Bastid]

A bigger MAB a will START the mains sooner. Taylor covered this in his book. What the Ulrich book says doesn’t supersede the Taylor book.

At low air speeds the MAB acts like an emulsion bleed and starts the mains sooner.

If anyone is that concerned about it, I can look up the page and post it so it can be read.

[440Duster]

I wouldn’t mind giving it a read.

[Rat Bastid]

Ok, I’ll look it up and post it.