Re: Secondary butterflies

[john althaus <althausjbl@xxxxxxx>]

Rich, 
I know everyone has had their say on this, but the AVS is to prevent the "bog" which isn't really a bog. but a lean stumble. These carbs do not have a secondary accelerator pump so as the secondaries open they must start drawing fuel to keep the mixture correct. Holley solved this problem by going to a "double pumper" which has a accelerator pump on the secondaries as well as on the primaries. The AVS allow the air flow to slowly match to the fuel available rather than opening suddenly and going lean. I'm sure that the weights are on the conservative side as evidenced by the Edelbrock tech telling you to drill them to open the sooner, but with out them you will get the lean stumble when suddenly going WOT.? If your old enough to remember the old "screw in the linkage" in the vacuum secondaries of Holleys you saw the same stumble you will experience.? Long and short of this, leave the AVS in and work on opening timing if your looking for the most from those carbs.

John Althaus
64 Savoy Hemi 4 spd


-----Original Message-----
From: Rich Kinsley <rlkinsley@xxxxxxxxx>
To: 1962to1965mopars@xxxxxxxxxx
Sent: Thu, 3 Apr 2008 10:29 pm
Subject: Secondary butterflies






Rich Kinsley '64 Dodge Polara 4dr 318poly w/goodies

I was just pondering what would happen if I was to remove the vacuum 
operated secondary butterflies from my pair of 500cfm Eddy's? The 
secondary side has two sets of butterflies. The set that is inline with 
the primary butterflies is mechanical linkage and a second set is up in 
the venturi and is vacuum operated. I guess I was pretty carb dumb until 
I started messing with these. I jave drilled the counterwieghts per 
Edelbrock tech line but I'm thinking that there'd be more flow without 
that interior set getting in the way. I know I'm gonna get spanked on 
this one but what about it?


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[Non-text portions of this message have been removed]


----
Please address private mail -- mail of interest to only one person -- directly to that person.  I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic.  Thanks!

'62 to '65 Mopar Clubhouse Discussion Guidelines:
http://www.1962to1965mopar.ornocar.org/mletiq.html.