If your nozzles are below the butterflies (which is most always the case)
the air bleeds help to prevent manifold vacuum from sucking gas out of the
nozzles (with associated BAD idling). I ran nozzles without air bleeds on my
turbo setup since they would be under pressure at boost and blowing fuel out
the air bleeds is not a good idea. The nozzles were in the traditional
location to begin with but we moved them to above the butterflies later to
avoid the vacuum problem at closed throttle. I'm sure their location above
the butterflies is less than ideal, but at least the car doesn't loads up at
idle. I understand that some later models of Hilborns vent the air bleed to
the injector body above the butterflies, and this would probably prevented
that problem, but I had the old ones, so we made do.
David, sunny So Cal, #317 C/BGC, C/BGALT
-----Original Message-----
From: Thomas E. Bryant [mailto:saltracer@awwwsome.com]
Sent: Friday, February 11, 2000 8:23 AM
To: ardunbill@webtv.net
Cc: land-speed@autox.team.net
Subject: Re: Tuning Mechanical Fuel Injection
The Herbert-Steen Streamliner had problems with the fuel being pushed
out of the nozzle air bleeds, that is why Bill Hurt was discussing this
problem with me and advised us to plug the bleeds. He said that these
air bleeds are just for a better idle, no affect on the high speed
functions.
Tom, Redding CA, #216 D/CC
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