Re: Testing the idle mixture

[rll <rlipinski3@xxxxxxx>]

Beers and years ago we did this type of thing on our six pack engines.

We removed the center carb and reinstalled the carb base with a piece of
card board as a gasket sealing the bores.

The idle mixture screws on the in/out board carbs are low on the bases.

You would then stick your fingers down the carbs to seal the idle air bleeds
to see if you were rich or lean.

Back when we were playing with the six pack setups, we never able to make
a "triple pumper set up" run as good as the vacuum controlled carbs.

maybe a lighter car , looser converter

rob/ferts/phx
65 sat




On 8/25/11 7:11 PM, Gary H. wrote:
> Anyone have experience doing it this-a-way?
>
> Testing the idle mixture on a carburetor-equipped engine: take off the air cleaner; proceed with a completely warmed up engine, choke open all the way, and engine idle speed set to factory specifications. Take a flat object and slide it slowly over the air horn of the carburetor in order to cut off the air flow. The fuel mixture is okay if there is no or little change in of engine speed when the air horn is nearly totally blocked off. If, while slowly sliding the flat object over the air horn of the carburetor the engine speed goes down, then the idle mixture is too rich; if the engine speed goes up while slowly sliding the flat object over the air horn of the carburetor, the idle mixture is too lean.
>
> Thanks,
> Gary H.

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