Re: Tuning Carter AFB? Should idle be 500 RPM?

[Jim Altemose <jaltemoose@xxxxxxxxx>]

Thanks MO.

The idle screw is touching the cam at 700 RPM.  I can increase the RPM
to 800 or 850 by screwing in.  The point I was trying to make is that
backing it off won't get me lower than 700 RPM.  I can get lower by
leaning out the idle mixtures more, but then it runs poorly and I
loose a lot of vacuum.

I did look at the fast idle screw and and at curb idle the screw is
not touching the cam.

I'll can try the throttle cable like you suggest.

Are you suggesting I should be able to get it down close to 500?

- Jim
Jim Altemose, Long Island, NY
'63 Polara 500 (Max Wedge)
'63 Polara 500 (383)
'65 Belvedere I (Street Wedge)
'71 Bronco

On Mon, Nov 28, 2011 at 3:32 PM, MO <micher@xxxxxxxxxxxxxxx> wrote:
>  Your idle speed screw should be touching the cam. Possibly something
> eles is stopping it . . Back the screw until  it is not touching the
> cam. . Make sure the throttle cable is  backing off far enough. ( take
> it off the carb and see if the idle screw then touches as it should.)
> Make sure your throttle blades are closing all the way. It could be
> the fast idle choke cam is interfereing. Or something eles on the carb
> is interfereing. .........................................MO
>
> On Nov 28, 10:37 am, Jim Altemose <jaltemo...@xxxxxxxxx> wrote:
>> Still struggling with tuning my 63 Polara 500, 383, 82,000 miles, 4
>> barrel Carter AFB (was a 2 barrel).
>>
>> I replaced all the plugs and it's running much better.  Plugs were all
>> fouled evenly.  Points were replaced by electronic; not sure what.
>> Picture is below.https://picasaweb.google.com/115013310552314897903/November262011
>>
>> I'm no great expert at tuning and I'm following the shop manual and
>> Internet info and such.  The vacuum gauge is pretty steady at 18,
>> which seems pretty good.
>>
>> The shop manual says idle RPM should be 500.  Is this true?  I'm at
>> about 700 RPM.  I can't back off the idle screw any more or it's not
>> touching the idle cam.  If I lean down the idle mixture screws, I can
>> get down to about 500 RPM, but it's running rougher and my vacuum goes
>> down to about 12.  I would think you want as strong a vacuum reading
>> as you can get, true?  Is it realistic to have 500 RPM?  If so, maybe
>> the carb needs a rebuild, or something else?
>>
>> I should be adjusting the curb idle before trying to adjust the timing, true?
>>
>> As always, thanks.
>>
>> - Jim
>> Jim Altemose, Long Island, NY
>> '63 Polara 500 (Max Wedge)
>> '63 Polara 500 (383)
>> '65 Belvedere I (Street Wedge)
>> '71 Bronco
>
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