T'Quad mixture screws

[jmbrodsky@domain.elided]

Nick,

     I run mine on the 392 T'all at about 4 1/2 turns out.  I go in to 4 for the
emissions (runs a little fast), and then out to 5 sometime if she's running lean
due to fuel additives, etc.  

     I also seem to be having trouble with my secondaries!  PLEASE ASSIST!
It appears that when I accelerate, it comes up just fine, until I get to the 
throttle setting where it starts to open the secondaries.  When the 2's open the
motor bogs, and feel like it's only hitting on 4 or 5 cyls.  It does not 
accelerate, nor decelerate, just maintains speed, but it sure is annoying 
because I have to wait *FOREVER* to pul out in traffic, else people plow me.

     So the word from the other gear-heads at work here,(none of them ever 
worked in a shop so their diagnoses are somewhat dealer oriented), is that the 
fuel supply is low.  I'm gonna throw in a fuel filter just because, (it's an 
inline between the fuel pump and the carb) and measure the output pressure 
before and after the swap.  Maybe that's it?  It would seem that if the bowl is 
full that it should pull till it drains, no?  I know that when I've had a low 
float, the surges from the fuel pump can be felt, not the same here.  Is the 
fuel pump a standard f@^d or a Ch@%y?  I hope the filter's the cause, since this
thing just happened over the space of 4 days.  Total degradation in accelerative
properties.  I s'pose that my mileage will go up now that the secondaries aren't
using, but I *liked* the acceleration of 392 cubes.

     Any info appreciated,


     -Joel Brodsky

         '76 IHC Scout II 345/tf727
         '75 IHC Travelall 150 4wd 392/tf727
         '72 Chev Carryall 3dr 4wd 350/th350 sold, but not forgotten.

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Date: Tue, 27 Jan 1998 22:13:00 +0000
From: Nicholas Rayer Jr <nrayer@domain.elided>
Subject: Re: thermoquad

The thermoquad on my 80 traveler seems to running excessively lean. With
the mixture screws backed out a little more than 3 turns I get a miss at
idle and the plugs are bright white. Anybody else notice how far out the
mixture screws are on theirs? Everything else works great on it, no
bogging and easy starting so I hate to replace it. If I do replace it,
any suggestions? I put an edelbrock and square bore intake on a previous
scout, but don't want to go this route again. Anyone ever put a Holley
4010 on a 345? I want keep the use of my cruise control and don't want
to modify the trans linkage.  

Nick

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