I don't know much about tuning carburetors, but when I ran one I drilled the
primary throttle plates, so that I could close them up and not run on the
intermediate circuit. I didn't do anything to the secondarys. Rich Fox
----- Original Message -----
From: "Scott Cowle" <SCowle@mentorcollege.edu>
To: <land-speed@autox.team.net>
Sent: Tuesday, September 20, 2005 05:16 AM
Subject: Carb tuning
> Quick question-I have a holley double pumper, with idle mixture screws at
all four corners. To get the carb to idle properly and enrichen properly I
have had to increase the opening on the secondaries significantly so the
primaries can remain closed enough so those idle mixture screws are
responsive but also so gas doesn't come out in gobs from the venturi tubes
at about 2000 rpm.But in this configuration it seems to me that the
secondary side is getting into the high speed circuit because those idle
screws are no longer functioning.In order to close up the secondary
throttles I assume people will drill holes in those throttle plates. But if
you do this to increase air flow in the secondaries at idle will it help
raise idle speed too, because if I close up the secondaries so as tro get
idle mixture screw response on the secondary side it idles too low.I'm new
to Holley carbs so any help is appreciated.
> Scott
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