hcccs
Well Known Member
I took my carb apart for a thorough cleaning and check and found a hole in the throttle throat I haven't seen before. I think I read about it in the Marvel Schebler handbook and they call it the BACK-SUCTION TYPE ENRICHMENT SYSTEM. The hole (fig 1) goes through the carb to the bottom (fig 3) and is exposed to atmospheric pressure. It also has a vent to the fuel chamber (fig 2). The hole should create some under-pressure at various throttle settings which should be fed to the fuel chanber. On the other hand the bottom hole is always exposed to atmospheric pressure so it doesn't add up. Does anyone have better knowledge on this?
Fig 1
Fig 2
Fig 3
Fig 1
Fig 2
Fig 3