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 Post subject: Idle RPMs
PostPosted: Mon Jul 09, 2018 7:24 pm 
356 Fan

Joined: Sat Mar 29, 2008 3:23 pm
Posts: 285
Location: Albuquerque, New Mexico
1963B Coupe Normal; running Weber 40s with Bosch 050 distributor. Suddenly the idle speed reduced itself to about 300 RPMs. Motor quits at that RPM. Wondering is there is a relatively simple adjustment to be made to increase the idle speed to around 750 RPMs?

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 Post subject: Re: Idle RPMs
PostPosted: Mon Jul 09, 2018 7:41 pm 
356 Fan

Joined: Sun Apr 20, 2008 12:54 am
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Each carb has an stop screw which adjusts the carb's idle RPM; For an balanced idle, you must use a Unisyn, or Sychronometer (gage).


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 Post subject: Re: Idle RPMs
PostPosted: Mon Jul 09, 2018 8:11 pm 
356 Fan
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Joined: Sat Apr 05, 2008 8:21 am
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Location: Augusta,Michigan
But if everything was fine with stable idle and you suddenly developed this then there is a reason to be found. Distributor plate was sticking for a long time and finally went back to base? Doubt it. Maybe a partially clogged idle jet? More history would help.

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 Post subject: Re: Idle RPMs
PostPosted: Tue Jul 10, 2018 6:16 am 
356 Fan
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Location: London
Have a look at this

http://www.356carburetorrescue.com/jackstaggs.html


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 Post subject: Re: Idle RPMs
PostPosted: Tue Jul 10, 2018 8:21 am 
356 Fan

Joined: Wed Apr 30, 2008 7:02 am
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Location: Washington DC Area
Jim,

Check your dwell-as the rubbing block on the points wears the dwell increases and the timing becomes retarded-a .004 reduction in point gap will change the timing by 3 degrees.

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 Post subject: Re: Idle RPMs
PostPosted: Tue Jul 10, 2018 9:36 am 
356 Fan
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I keep beating this horse, but it's sill not dead:
DO NOT adjust the carbs first.
Do a complete tune up in the proper sequence, and adjust the carbs to suit what the specific values (valves and ignition) want.

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 Post subject: Re: Idle RPMs
PostPosted: Wed Jul 11, 2018 4:45 am 
356 Fan
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Ron LaDow wrote:
I keep beating this horse, but it's sill not dead:
DO NOT adjust the carbs first.
Do a complete tune up in the proper sequence, and adjust the carbs to suit what the specific values (valves and ignition) want.


That is what the link I posted suggests :)


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 Post subject: Re: Idle RPMs
PostPosted: Fri Jul 13, 2018 4:58 pm 
356 Fan

Joined: Wed Apr 30, 2008 7:02 am
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Location: Washington DC Area
Jim,

Did you ever solve your low idle problem?

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 Post subject: Re: Idle RPMs
PostPosted: Sat Jul 14, 2018 7:42 pm 
356 Fan

Joined: Sat Mar 29, 2008 3:23 pm
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Location: Albuquerque, New Mexico
Thanks for the responses. Car has been sitting in the garage and I haven't had time to attend to it. I really do not have the skills and am attempting to get it into my wrench for a couple of issues, the low idle RPM being one of them. In the meantime, I am wondering whether I can adjust the carb linkage to accomplish a higher idle RPM? This would be only a temp fix until the issue can be addressed further. Thanks again.

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 Post subject: Re: Idle RPMs
PostPosted: Sat Jul 14, 2018 10:06 pm 
356 Fan
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Jim,
If you bandaid it, it just makes the proper adjustments more difficult. Why not just get it to him and let him to the correct process?

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 Post subject: Re: Idle RPMs
PostPosted: Sat Jul 14, 2018 10:18 pm 
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Location: Alpine AZ, Green Valley AZ
+1 on what Ron says. You would be adding a complication if you adjusted the linkage without knowing that it was the problem. You indicated the idle suddenly dropped to the 300 range. I'd let the wrench know everything you've told us and let him find out what took place. I'm assuming that your wrench is well qualified in these fine cars.

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