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12-20-2021, 10:10 AM | #1 |
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Holley 94 accelerator pump tuning
All of my carb rebuilding experience has been on the Rochester B and BC. That's probably the most straightforward carb on the planet, as it has like 15 parts. I'm rebuilding the 94 for for my '49 8ba and I see the accelerator pump bracket has 3 holes on it. Can anybody tell me exactly what moving the C link to a different hole does?
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12-20-2021, 10:22 AM | #2 |
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Re: Holley 94 accelerator pump tuning
Moving link to outer holes shortens or lengthens the throw. Middle hole is the standard setting.
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12-20-2021, 10:28 AM | #3 |
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Re: Holley 94 accelerator pump tuning
Mine was set in the middle but why would I want to shorten or lengthen the throw? What would that affect as far as carb operation?
Last edited by CJStefan; 12-20-2021 at 10:45 AM. |
12-20-2021, 10:46 AM | #4 |
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Accelerator pump tuning
Climatic conditions
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12-20-2021, 10:55 AM | #5 |
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Re: Holley 94 accelerator pump tuning
Usually they are marked 1-2-3. I would imagine C stands for co;d and would provide a larger shot. Cold air is denser and so would require more fuel for a correct mixture.
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12-20-2021, 11:12 AM | #6 |
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Re: Holley 94 accelerator pump tuning
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12-20-2021, 11:39 AM | #7 |
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Re: Holley 94 accelerator pump tuning
Right. Fuel being heavier than air, it tends to drop out at that moment of acceleration when the butterfly first opens, there will otherwise be a "bog" or hesitation without an extra squirt of fuel to compensate by the accelerator pump circuit, until everything gets caught up. In cold weather this pump shot needs to be richened further.
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12-20-2021, 11:45 AM | #8 |
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Re: Holley 94 accelerator pump tuning
Is there a general temp range for each setting? With this becoming my daily driver and being in Maryland seeing below zero to above 100, that would be a huge pain to change that setting every time I drive.
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12-20-2021, 12:07 PM | #9 |
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Re: Holley 94 accelerator pump tuning
I would think tweaking down to this degree would be different for each car. Kinda like how much choke to use on start-up. Each engine/carb is a little different. Just have to get to know what your engine likes.
Maybe adjust it in the fall for richer operation, and then re-adjust again in the spring. |
12-20-2021, 12:07 PM | #10 |
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Re: Holley 94 accelerator pump tuning
With the quality of gasoline today, the original seasonal fine tuning of the accelerator pump is usually not an issue unless other factors are involved. I'd set it on the longest (rich) stroke and leave it.
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12-20-2021, 12:15 PM | #11 |
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Re: Holley 94 accelerator pump tuning
Would that be furthest left or right? I haven't taken a good look at it yet?
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12-20-2021, 12:26 PM | #12 |
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Re: Holley 94 accelerator pump tuning
Per the 39 reference manual the #1 hole (left) is for summer # 2 (center) is for winter and # 3 is for extreme cold temp.
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12-20-2021, 12:30 PM | #13 |
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Re: Holley 94 accelerator pump tuning
Sweet thank you sir. Is that info in the green bible as well?
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12-20-2021, 12:54 PM | #14 |
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Re: Holley 94 accelerator pump tuning
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12-20-2021, 12:56 PM | #15 |
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Re: Holley 94 accelerator pump tuning
Alright thanks for the responses everyone. I truly appreciate it. As of today I'm waiting for a new check ball for the accelerator pump well before I can finish putting the carb together. Damn thing fell out and onto the garage floor never to be seen again
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12-20-2021, 03:44 PM | #16 |
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Re: Holley 94 accelerator pump tuning
Middle hole all 12 months....if you need that link e mail and I'll get one off to you pronto.
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01-09-2022, 09:03 PM | #17 | |
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Re: Holley 94 accelerator pump tuning
Quote:
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01-09-2022, 10:55 PM | #18 | |
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Re: Holley 94 accelerator pump tuning
Quote:
In one of your previous posts, you asked if adjusting the mixture screws would be the same as moving the C clip. The answer to that is no, those adjustment screws are for the idle circuit, not related to the accelerator circuit. Your best bet is to read the nomenclature of the 94 carb to understand the functions of the three different circuits and how they function in operation.
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01-11-2022, 09:27 AM | #19 |
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Re: Holley 94 accelerator pump tuning
Mine is set in the middle the two outer settings are for hot or cold climate.
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01-11-2022, 10:05 AM | #20 |
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Re: Holley 94 accelerator pump tuning
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