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Old 08-13-2016, 11:02 AM   #226 (permalink)
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I think you'd have better luck with a vacuum secondary carb.
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Old 08-16-2016, 08:19 AM   #227 (permalink)
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So changing jets didn't make a HUGE difference in eliminating the off idle bog. I'm testing various size power valves now. I started with a step smaller, but that made it worse. One step larger helped a tad, so I'm going even bigger.

There's an absurd amount of conflicting advice on the web regarding a perfect "formula" for determining the size. The best I can extract is that there is no definitive way and every engine is different. So I experiment!
Good deal, sounds like you are getting it dialed in...

The last carb I had on my carb'd combo was a 750 pro-form vac-secondary. Probably too much carb for what I had but it was very forgiving tuning wise.

A bog transitioning to full power is usually a momentary lean condition. A sooner opening PV may help. Don't forget to try playing with accelerator pump shot discharge nozzles and/or accel pump cams too.
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Old 08-16-2016, 09:56 AM   #228 (permalink)
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I think you'd have better luck with a vacuum secondary carb.
Maybe on initial tuning, but I'm running a manual transmission and bigger than normal cam. I like the opportunity to fine tune for the performance I want.

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Good deal, sounds like you are getting it dialed in...

The last carb I had on my carb'd combo was a 750 pro-form vac-secondary. Probably too much carb for what I had but it was very forgiving tuning wise.

A bog transitioning to full power is usually a momentary lean condition. A sooner opening PV may help. Don't forget to try playing with accelerator pump shot discharge nozzles and/or accel pump cams too.
Yep....once I get the nasty bog out I'll be tuning further with jets, nozzles, and cams. Kind of the "fun" of it I guess
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Old 08-16-2016, 07:51 PM   #229 (permalink)
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Maybe on initial tuning, but I'm running a manual transmission and bigger than normal cam. I like the opportunity to fine tune for the performance I want.
Yeah, but those mustangs are also on the heavy side.
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Old 08-17-2016, 06:42 AM   #230 (permalink)
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As stated above try a different cam for the squirters on the secondaries. Get them to open quicker. I run a 650 Holley double pump on my derby cars. Carb has been on everything from a Buick 231, Chevy 305, Chrysler 400, Buick 430 and most recently I have it on a caddy 472. Pretty much each engine has needed a can change to get rid of a stumble, and the 400, 430 and the 472 needed alcohol squirters installed in the secondary ports. They just wanted fuel!
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Old 08-17-2016, 09:52 AM   #231 (permalink)
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As stated above try a different cam for the squirters on the secondaries. Get them to open quicker. I run a 650 Holley double pump on my derby cars. Carb has been on everything from a Buick 231, Chevy 305, Chrysler 400, Buick 430 and most recently I have it on a caddy 472. Pretty much each engine has needed a can change to get rid of a stumble, and the 400, 430 and the 472 needed alcohol squirters installed in the secondary ports. They just wanted fuel!
Good to know.

My stumble, or seems more like a bog, is right off idle or cruise. It "feels" fine at the point in which I think the secondary is coming in, but I could be wrong.
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