Main Air Bleed Info

[bytor]

Sharing a graph the I ran across a few years ago depicting the AFR response to the main circuit jet, main air bleed, emulsion hole and kill bleed changes. The + and - represent an increase or decrease in orifices size. It helped me understand the nonliner affect the air bleeds and emulsion holes have on the AFR. This also represents how a larger air bleed = richer AFR when the main circuit starts up due to the emulsion effect.

 

[Indycars]

Thanks for the info!

I had to google the term "Kill Bleed" and in the process came across this picture
identifying the passages in a carburetor. One person said that the top hole of #22
is the kill bleed, don't know if that is correct or not.

Another name for "Kill Bleed" is Anti-Siphon.

 

[bytor]

Thanks for the info!

I had to google the term "Kill Bleed" and in the process came across this picture
identifying the passages in a carburetor. One person said that the top hole of #22
is the kill bleed, don't know if that is correct or not.

Another name for "Kill Bleed" is Anti-Siphon.

Yep, my understanding is the kill bleed primarily prevents the boosters from siphoning fuel when the butterflies slam shut. But, it also has some control on when the boosters start up.