<VV> Possible Answer? Re: idle question 2

[frankcb at aol.com]

    Would it make sense to install a WIDE-band Oxygen sensor (with dashboard readout) in the exhaust line?  I believe modern cars use these to provide feedback to the computer to adjust the air/fuel ratio entering the combustion chambers of the engine.  But we could use it to let us know UNDER WHAT CONDITIONS the mixture entering the cylinders has become too lean (or too rich) for correct firing.
    Amazon offers these in the $150 to $200 range.
    Frank Burkhard
    Boonton, NJ
    
 
 
-----Original Message-----
From: Jay Maechtlen via VirtualVairs <virtualvairs at corvair.org>
To: Matt Nall <patiomatt at aol.com>; virtualvairs <virtualvairs at corvair.org>
Sent: Thu, Jul 10, 2014 12:16 pm
Subject: Re: <VV> idle question 2


On 7/9/2014 7:57 PM, Matt Nall via VirtualVairs wrote:
>       Well, tonight I had to move the car across the driveway.  The engine was
> stone cold not having been run in a week.  Imagine my surprise when I started 
it
> (carbs with
> 51 jets and the chokes closed) the CAR IDLED PERFECTLY!!!!!!!!!!!!!  Smooth as
> silk.  Then, as it warmed up and the chokes opened, back to the same crap.
> Probably the same thing that happened with the other (50 jet) carbs
> My second question is this:  This sure does point to the jets being too small,
> right?  Sounds logical to me.  I thought about putting in #53's.  I saw
> something in the
> Clark's catalogue about using jets a size bigger because of today's crappy 
gas.
> I only want to do this job once, so any and all thoughts and opinions welcome.
> Thanx.
>    
> Randy
>
> ==============================================================================================
>
>
> Randy!!  Mainjets have nothing to do with idle / off idle
>
>
> Do you have TWO  good streams of fuel when you snap the throttle open from 
each carb? [accelerator pumps ]
>
>
> Also,  have you disconnected the down link on the passenger carb and then snap 
opened ONE carb at a time?  It may be only one carb...
>
But he can run down the freeway as long as he keeps light throttle.
Doesn't that suggest that the  off-idle is ok?
If the jets were ok, it should run fine when he mashes it in midrange, 
aside from any stumble caused by possible accelerator pump issues.

Another thing - Won't headers and free-flowing mufflers tend to lean the 
mixture?


-- 
Jay Maechtlen SoCal '61 2-dr modified w/fiberglass skin, transverse 3.8 
Buick V6 TH440T4 trans

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