Re: [Chrysler300] Air/Fuel ratio for long rams

[Tony Rinaldi <awrdoc@xxxxxxxxx>]

Hi Warren,

Ray Barton Racing Engines was able to get my new engine within your
recommended A/F ratio specs.

The original dyno showed that the A/F ratios were too rich. They had to
change the primary and secondary jets to lean out the overall ratios.

The idle is smooth @ 750 and increased peak HP by 5 while extending the
strength of the HP thru an additional 300 rpms while maintaining the high
torque. The R & L A/F ratios now are almost exactly the same.

Thank you again for sharing your expertise.

Tony Rinaldi
300-F Conv¹t


From: Warren Anderson <wranderson@xxxxxxxxxxxxx>
Date: Wed, 14 Jul 2010 13:01:30 -0700
To: Chrysler 300 Club <Chrysler300@xxxxxxxxxxxxxxx>, Anthony Rinaldi
<awrdoc@xxxxxxxxx>
Subject: Re: [Chrysler300] Air/Fuel ratio for long rams
> 
> There are four zones to look at. Idle,  off-idle (transition), cruise and
> power. With an AFR device all can be checked  but some need to be checked
> underload, on the road, or on a dynamometer.
>  
> 
> Idle mixture should not be 'best idle' but instead something leaner for
> economy reasons and throttle response off idle. I like 13.5:1 whenever
> possible and 14:1 is good also.  Set correctly in this range, and with  all
> else OK and you will see a crisp, sharp, off- idle get go. Brings a  smile to
> your face.
>  
> 
> The transition mixture is something between idle circuit supplied and the
> main metering circuits supplied and too fat or lean on basic idle will  show
> up off idle.   
>  
> 
> Cruise is the main metering circuit but in some  cases with way over rich idle
> mixtures, idle setting can effect cruise. Lean  run limit will be at 15:1 but
> a cruise mixture 14: 1 to 14.5:1 would be nice  but down around 13:1 will be
> found. This can be checked, sort of, at 2500 RPM  free run. 12.5:1 or lower
> will be a gas guzzler and unecessary.
>  
> 
> Power mixture should be 12.5:1 or less. At about 10  normally there is black
> smoke. Carburetors with primary and secondary metering  venturis have booster
> circuits for heavy load running. A real general point  where enrichment should
> be apparent would be underload at high speed cruise  and less than 10"
> manifold vacuum.
>  
> 
> Something else that can be checked is the presence  of or not of the
> accelerator pump. Light throttle stab from idle and meter  should show a
> spike.
>  
> 
> Warren Anderson
>  
> 
> Sedona,AZ
> 
> ______________________________________________________________
> 
> Hi to all Technophiles:
> 
> Does anyone know what the proper A/F ratios  are for 1960-61 long ram carbs?
> 
> Is 14 too lean or too rich?
> 
> Tony  Rinaldi
> 300-F Conv&#39;t




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