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Author Topic: Rich off idle stumble.  (Read 29 times)

Offline 77cruiser

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Rich off idle stumble.
« on: August 09, 2025, 02:21:35 PM »
I'm getting a stumble off idle light throttle tip in. I have the linkage in the outer hole, was worse on the inner hole.
Combo 421 SBC Vic JR. 227/239 @ 0.05 hyd roller 9.8 CR 18 deg initial w/10 deg manifold vac.
Pretty sure the accel discharge hasn't been opened up, I didn't note it on my sheet.
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Jim

Offline Kenth

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Re: Rich off idle stumble.
« Reply #1 on: Today at 12:40:19 AM »
18 deg initial is a lot and to me it indicates a too lean idle circuit.

What carb and recipe?
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Offline 77cruiser

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Re: Rich off idle stumble.
« Reply #2 on: Today at 08:29:46 AM »
17084226
Idle tube  .031
Idle down .052
Idle disc.  .093
IABP        .136
Idle AB moved to air horn .043
Lower idle bleed .062
MAB blocked drilled for Dual MAB .046
P jet   .074
P rod   52M
Inlet seat .144
Float 5/16
SAB .026
Hanger G
Rods   CV
Air valve 1.29

Goes rich at light tip in to about 10 AFR then back to 13-13.5

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Jim
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