Annular boosters on a Tunnel Ram
I spent some hours last night on the dyno testing booster startup point in rpms vs main air bleed size. I tested at no load, high 40's and mid 60's ftlbs torque. My results were that booster startup occurred within 100 rpm regardless of main air bleed size. I tested with .025, .035 and .045 bleeds. I even took the bleed out and it was still within that 100 rpm. My test could be flawed. If it is someone please point out my error. Also maybe someone could try to repeat this test on their motor and report back with their results. I'm starting to think that the main air bleed isn't the cork in the bottle when it comes to booster startup. I attached a photo of my results. please excuse the sloppy writing.Bewy, I see the straw comparison, it is in my posts as well for leaning out WOT. We agree a larger MAB will lean WOT. Once fuel is flowing, and throttle blades are open, the pressure differences limit or even stop flow.
I do not see the post referencing how a larger MAB will start the mains sooner. To me the quote...An emulsion of air and fuel has reduced density, surface tension and viscosity compared to fuel alone. This increases the flow of fuel considerably, particularly in low-pressure difference operation, at low throttle openings or lower engine speeds. Just how much of an increase (richer) is dependant upon where and how much air is introduced into the fuel flow. says it will start sooner.
I am not arguing. Just trying to understand where you are coming from.