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Old 02-27-2019, 07:23 PM   #21
rotorwrench
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Default Re: Idle Screw - Running Issue on a '33 BB

If you have to adjust the idle up then something is sure wrong. Vacuum leak could be a factor. Some of those old manifolds can leak internally. Some of the ones in the 21 stud era were problematic that way.
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Old 02-27-2019, 08:34 PM   #22
Tinker
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Default Re: Idle Screw - Running Issue on a '33 BB

Drbrown and Drolston have a great method to follow. Once you get it running at a reasonable running rpm then you can fine tune with a vacuum gauge. I agree with a turn and a half or quarter.

Then when that is sorted and you are still having issues with power acceleration under load. Try MMO down the carb when running, or a new condenser (maybe a couple as they are bad out of the box).

I know the MMO treatment is pretty joked about, but my rebuilt 81a stumbled under load and bucked. After a couple of smoke outs it freed up the valves that were sticking. Only do it once a yr now, but it runs well under load.

Last edited by Tinker; 02-27-2019 at 08:48 PM.
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Old 02-28-2019, 10:57 AM   #23
30AAFord
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Default Re: Idle Screw - Running Issue on a '33 BB

New fuel pump is from Mac's - went with later glass bowl style (that's what was on the engine when I got it and liked the ability to check sediment collection). Have not tested pressure.

I can see no open ports on the 59A base, but will check again when I see the truck next.

Don't have a vacuum gauge, but looks like I need to get one. How am I hooking the vacuum gauge to fine tune carb? Am I using the port on intake that connects to vacuum advance line for distributor?
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Old 02-28-2019, 02:04 PM   #24
petehoovie
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Default Re: Idle Screw - Running Issue on a '33 BB

Disconnect the vacuum line to the windshield wiper motor and connect your vacuum gauge at that point....
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Old 02-28-2019, 03:51 PM   #25
Mike in AZ
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Default Re: Idle Screw - Running Issue on a '33 BB

Have had reports of new fuel pumps putting out too much pressure, causing flooding. Good luck on figuring out solution(s) to you problem. Mike
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Old 02-28-2019, 04:06 PM   #26
30AAFord
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Default Re: Idle Screw - Running Issue on a '33 BB

Petehoovie - thank you, will get a vacuum gauge and do that.

Was given a box full of old fuel pumps - could always swing test a few of those out if the vacuum test comes back negative and carb adjustments do nothing.
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