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10-23-2019, 10:34 PM | #1 |
Junior Member
Join Date: Dec 2015
Location: Colorado
Posts: 7
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weird hesitation
I have a 1959 292 y-block, bored .030, pertronix 2, headers, mumert intake, avs2 500 cfm carb, original 4 speed T98. Also running autolite 46 plugs gapped .040. At around 2800 rpm under decent acceleration i get some hesitation. If i ease into that range it doesn't do it and pulls good on up. But put load on it and she falls on her face a bit. Any thought on what could be causing this? what is this a symptom of? Are the secondaries opening too soon?
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10-24-2019, 12:24 AM | #2 |
Senior Member
Join Date: Mar 2016
Location: LaGrande Oregon
Posts: 866
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Re: weird hesitation
Just a guess here..........my 302 had similar symptoms and it turned out to be the coil. Hope this helps.
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10-24-2019, 08:23 AM | #3 |
Senior Member
Join Date: May 2010
Location: St. Michael, Minnesota
Posts: 1,713
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Re: weird hesitation
It sounds like a lean condition. I would check the accelerator pump first.
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10-24-2019, 10:24 AM | #4 |
Junior Member
Join Date: Jul 2019
Location: Medicine Hat, Alberta
Posts: 15
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Re: weird hesitation
Any backfire or cough? Almost sounds lean and that would likely be power valve or accelerator pump.
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10-24-2019, 10:24 AM | #5 |
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Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,706
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Re: weird hesitation
If the ignition is in good shape and advancing properly, and if it's not an issue like accel pump shot from the carb, then I guess it's possible the air valve over the secondaries has the spring set too light, since these carbs are used on a wide variety of engines.
If the hesitation is when you get into the secondaries, then maybe play with the spring tension on the air valve and see what happens. I would say slightly more tension for a first try. Sal |
10-24-2019, 10:26 AM | #6 | |
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Join Date: Jun 2010
Location: Detroit suburb, MI
Posts: 3,706
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Re: weird hesitation
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Quote:
The AVS has no power valve to speak of. pretty sure it uses metering rods controlled by manifold vacuum. Sal |
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10-24-2019, 02:16 PM | #7 |
Senior Member
Join Date: May 2010
Location: Granite City, Illinois
Posts: 3,008
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Re: weird hesitation
Not that this might be related, but you mentioned you have the plugs gapped at .040. Shouldn't it be more like .035 ???
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10-24-2019, 03:01 PM | #8 | |
Senior Member
Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,485
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Re: weird hesitation
Quote:
If the spark is hot enough, you can open the gap to get a hotter burn.
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10-24-2019, 06:27 PM | #9 |
Junior Member
Join Date: Dec 2015
Location: Colorado
Posts: 7
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Re: weird hesitation
Thanks guys I will try a few things like tighten the 2ndary spring flap. I also am going to try autolite 45s at .035. I have played with the holes on the accelerator pump and the bottom hole (smallest shot) is they only one that runs good. the other holes give me bog off the line.
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10-28-2019, 08:15 AM | #10 |
Member
Join Date: Jun 2018
Location: Ridgecrest, CA
Posts: 74
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Re: weird hesitation
So at some point, was the engine running properly and this problem creeped up?
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10-28-2019, 09:26 AM | #11 | |
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Join Date: Aug 2012
Location: IN A 'GALAXIE' FAR FAR AWAY
Posts: 6,485
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Re: weird hesitation
Quote:
You need to find online the INTR SHEET for the kit shown below to guide you. Make sure you choose correct kit.
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11-02-2019, 05:20 PM | #12 |
Junior Member
Join Date: Dec 2015
Location: Colorado
Posts: 7
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Re: weird hesitation
So I jetted in down one size jet and rods, adjusted timing, and have accelerator pump arm in lower hole and the hesitation is almost gone.
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