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scott woodward
Samba Member
Joined: January 22, 2004
Posts: 136
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 Posted: Thu Dec 12, 2024 9:45 am Post subject: 34-pic3 carb popping |
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I got a 34 – pick three carburetor on my 1776. I’ve got everything adjusted starts right up, but there’s a consistent popping out of the carburetor, needle valve? I’ve taken it apart and cleaned everything and blown out the ports put it back on and readjust it and I get the same thing. Any ideas? Thanks guys.
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my3bugs
Samba Member
Joined: June 18, 2003
Posts: 594
Location: Moreno Valley
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| Posted: Thu Dec 12, 2024 9:54 am Post subject: Re: 34-pic3 carb popping |
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| are the valves adjusted right ? |
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aquifer
Samba Member
Joined: August 30, 2021
Posts: 179
Location: Nebraska
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| Posted: Thu Dec 12, 2024 10:08 am Post subject: Re: 34-pic3 carb popping |
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Like a backfire? Check the valve adjustments as suggested, and make sure your timing is correct too.
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scott woodward
Samba Member
Joined: January 22, 2004
Posts: 136
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| Posted: Thu Dec 12, 2024 10:28 am Post subject: Re: 34-pic3 carb popping |
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Time is correct and valves adjustments, correct but I’m gonna double check, thank you
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 16336
Location: North Florida, USA
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| Posted: Thu Dec 12, 2024 10:49 am Post subject: Re: 34-pic3 carb popping |
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| scott woodward wrote: |
| Time is correct and valves adjustments, correct but I’m gonna double check, thank you |
Please confirm how you have both set? Details/numbers/method pls.
Spark igniting the intake mixture... valve stuck open or incorrect ignition timing?
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AshMan40
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'67 Beetle #1 {project car that never made it to the road  }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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rcooled
Samba Member
Joined: September 20, 2008
Posts: 2652
Location: Santa Cruz, CA
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| Posted: Thu Dec 12, 2024 12:00 pm Post subject: Re: 34-pic3 carb popping |
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| scott woodward wrote: |
| ...but there’s a consistent popping out of the carburetor |
Is the carb an original German SOLEX, or some aftermarket clone? Did this issue start suddenly, or has it always been occurring to some degree? Is it happening only at idle, or throughout the entire RPM range?
Does the car still drive normally with the usual amount of power? Has it always run pretty well before now? Have the valves always been adjusted to spec, or is the motor's maintenance history unknown? Do you know many miles are on it?
A cracked or burnt intake valve (though not very likely if always properly adjusted), as well as an overly-lean fuel mixture can cause the symptoms you describe. A 1776 will be inhaling more air than a 1600 and the carb may require different jetting to compensate. What size jets (main, idle & air correction) are in the carb now?
The level of fuel in the carb's float bowl can play a role here too. With the carb top and gasket removed, the fuel level should be about 3/4" down from the lip of the bowl with the float in place. The level is set by adjusting the thickness of the washer(s) under the inlet valve.
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OldBeetles
Samba Member
Joined: October 10, 2024
Posts: 60
Location: Northeast
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| Posted: Thu Dec 12, 2024 1:08 pm Post subject: Re: 34-pic3 carb popping |
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| Can you make a video showing what it's doing? |
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Schnitzelfuss
Samba Member
Joined: September 18, 2024
Posts: 60
Location: North Alabama
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| Posted: Thu Dec 12, 2024 4:36 pm Post subject: Re: 34-pic3 carb popping |
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| Popping = mixture too lean. |
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scott woodward
Samba Member
Joined: January 22, 2004
Posts: 136
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| Posted: Fri Dec 13, 2024 11:28 am Post subject: Re: 34-pic3 carb popping |
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You guys are great thanks for all the tips number one. I waited till this morning when the valves were completely cold, the right side was pretty good except two were slightly tight, the driver side number three I readjusted but the other one one, the push rods had come off. You guys are so on so I reinstalled it readjusted everything check the points last night I rebuilt the carburetor cleaned everything out turn the key and the sucker fired up. Smooth is Silk sounds phenomenal. I’m a happy man, I’ve been waiting for this moment dreaming about it while doing chemo. Thank you guys and don’t forget to get your colonoscopy because it really matters. Thank you, Scott.
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ashman40
Samba Member
Joined: February 16, 2007
Posts: 16336
Location: North Florida, USA
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| Posted: Fri Dec 13, 2024 11:44 am Post subject: Re: 34-pic3 carb popping |
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Glad to hear you got it running well! 
This just illustrates how robust these ACVW engines are. You thought it was running badly when in fact it was running on only 3-cyls! 
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AshMan40
---------------------------
'67 Beetle #1 {project car that never made it to the road }
'75 Beetle 1200LS (RHD Japan model) {junked due to frame rot}
'67 Beetle #2 {2019 project car - Wish me luck!} |
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scott woodward
Samba Member
Joined: January 22, 2004
Posts: 136
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| Posted: Fri Dec 13, 2024 12:56 pm Post subject: Re: 34-pic3 carb popping |
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Exactly!!
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Schnitzelfuss
Samba Member
Joined: September 18, 2024
Posts: 60
Location: North Alabama
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| Posted: Fri Dec 13, 2024 4:21 pm Post subject: Re: 34-pic3 carb popping |
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| …and prayers for you, from me, for a successful treatment and a long and fulfilling life. |
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