Stumble under quick wot

[Rusty Nail]

Good to see @Ricko1966 back around, hi bud!

 

[Ricko1966]

Now go reread what I wrote and try it.

 

[iamtherealJayy]

Here’s videos from this morning.

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In the second video with the revs you can hear when I quickly wot it tries to die if I stay in it it will shake and sputter and eventuslly bring the rpm up. In the driving video I was laying into the throttle in the long straight, up hills it doesn’t seem like it wants to go much faster. My speedometer is off, it’s at about 100 when I’m sitting still so 0 is roughly 45. I showed the speedo at around 15 which would be around 60.

 

[AuroraGirl]

Here’s videos from this morning.

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In the second video with the revs you can hear when I quickly wot it tries to die if I stay in it it will shake and sputter and eventuslly bring the rpm up. In the driving video I was laying into the throttle in the long straight, up hills it doesn’t seem like it wants to go much faster. My speedometer is off, it’s at about 100 when I’m sitting still so 0 is roughly 45. I showed the speedo at around 15 which would be around 60.

sounds rich or the advance isnt where it needs to be.

 

[iamtherealJayy]

In which part? I leaned it some since I played with the timing. I did about a quarter turn in on each screw

 

[AuroraGirl]

In which part? I leaned it some since I played with the timing. I did about a quarter turn in on each screw

That’s only idle I’m pretty sure

 

[iamtherealJayy]

How would I adjust the off idle mix? Metering rods and jets?

 

[AuroraGirl]

How would I adjust the off idle mix? Metering rods and jets?

https://www.edelbrock.com/media/wysiwyg/documents/carb-owners-manual.pdf

 

[AuroraGirl]

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what hole on the accelerator pump lever is the linkage in? the one closests to the top of the carb is more aggressive and the furthest is least. I believe they come placed in the center.

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here is an old pic of mine, on the center(look at the brass linkage running from the throttle lever up to the top of the carb, its 3 circles with the link in the center of the 3) You may try the lower one if you wanted

 

[iamtherealJayy]

I believe the accelerator is still in the middle I haven’t changed it. If I set it to the least would that effect the secondaries as well? I’d invest in an afr gauge but that’s a lot of work for my current exhaust it just doesn’t make it worth it.

 

[Rusty Nail]

Dude.
You are overflowing with questions.
Rather than guess what the settings are, take my advice and go look at it. You will likely be surprised to see you may find answers.

Don't try to skip ahead. Auto mechanics is slow and steady - one thing at a time, in my experience.
Getcha a pair of blinders and put.them.on.

That's good advice.

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Horses wear blinders to reduce their field of vision and stay focused on their tasks. When pulling loads or racing, horses are easily distracted. Horses that pull wagons in cities need blinders to keep their attention focused straight ahead and block out the distractions around them.

 

[iamtherealJayy]

I’ve had this carb apart before but I don’t remember the factory jet size or anything related, it’s all still factory settings. I’ll have to dig out the book and read up some. I agree I can’t concentrate on much of anything.

 

[rich weyand]

Vacuum advance on ported will always stumble on suddenly coming off idle. The vac cylinder needs time to synch up with manifold advance, which is where it should have been. Put the vacuum advance on manifold vacuum and retune.

Ignition Timing for First-Generation GM V-8 Engines

I pulled all my ignition timing rants from multiple forums together into one post for another forum, so I thought I would post it here as well. Ignition timing, including base timing, total timing, mechanical advance, and vacuum advance, which can be either ported vacuum or manifold vacuum...

www.gmsquarebody.com

 

[Ricko1966]

Vacuum advance on ported will always stumble on suddenly coming off idle. The vac cylinder needs time to synch up with manifold advance, which is where it should have been. Put the vacuum advance on manifold vacuum and retune.

Ignition Timing for First-Generation GM V-8 Engines

I pulled all my ignition timing rants from multiple forums together into one post for another forum, so I thought I would post it here as well. Ignition timing, including base timing, total timing, mechanical advance, and vacuum advance, which can be either ported vacuum or manifold vacuum...

www.gmsquarebody.com

Told him this post 5 again post 17 .let's see how many more posts before he tries it.

 

[potent rodent]

move your vac adv to full manifold vac and try and put your acc pump rod in the top hole for a quicker pump shot , timing is very important on sbc they like around 34 to 36 degrees of total timing