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 Post subject: I need a Carburetor
PostPosted: Sat May 20, 2023 4:48 am 
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TBI Slant 6

Joined: Thu Sep 15, 2022 12:00 pm
Posts: 142
Car Model: 1963 Plymouth valiant
I'm at my wits end trying to get a well functioning carb for my 63 Valiant; My original Holley 1920 has been "rebuilt" bu friend but it still runs like crap; So I bought a "new" remanfuctured Carb from Rockauto (an "autoline" 1 bbl carb, which I think is a UnRemco carter) It also runs terrible in spite of all my adjustment efforts. SO,,, I am tempted to send my Holley off to (Uremco) to have it rebuilt.... Is this is a wise move?? I am not sure where to go from here..


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 Post subject: Re: I need a Carburetor
PostPosted: Sat May 20, 2023 5:50 am 
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EFI Slant 6

Joined: Thu Apr 18, 2019 7:57 am
Posts: 321
Location: Lawrenceville, GA
Car Model: 1966 Dodge Dart
Might need to be more specific on what sort of crap it's running like.

While I can easily believe a parts store carburetor would be junk out of the box, this could potentially be a totally different issue such as an ignition problem.

_________________
Matt Cramer
1966 Dodge Dart turbo / EFI project


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 Post subject: Re: I need a Carburetor
PostPosted: Sat May 20, 2023 11:03 am 
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TBI Slant 6

Joined: Thu Sep 15, 2022 12:00 pm
Posts: 142
Car Model: 1963 Plymouth valiant
I've tuned the motor (new plugs, new wires, new distributor, adjusted the timing (when it did run), also new reconditioned head, including new springs, etc.

Plus it idled fine, just bogs down really bad when I open the throttle.


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 Post subject: Re: I need a Carburetor
PostPosted: Sun May 21, 2023 7:18 am 
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Triple Duece Weber
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Joined: Tue Nov 23, 2004 6:05 pm
Posts: 2118
Location: Desoto Texas
Car Model: 1972 Dodge Colt
Sounds like a vacuum leak, have you put a gage on it to see what your reading?

_________________
Hyper_pak


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 Post subject: Re: I need a Carburetor
PostPosted: Mon May 22, 2023 3:52 am 
Offline
TBI Slant 6

Joined: Thu Sep 15, 2022 12:00 pm
Posts: 142
Car Model: 1963 Plymouth valiant
Yeah, not a vacuum leak


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 Post subject: Re: I need a Carburetor
PostPosted: Mon May 22, 2023 4:28 am 
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SL6 Racer & Moderator
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Joined: Sat Oct 19, 2002 12:06 pm
Posts: 8515
Location: Silver Springs, Fl.
Car Model:
valleyguy wrote:

Plus it idled fine, just bogs down really bad when I open the throttle.

If it idled fine, probably not a vacuum leak. Sounds like either a timing issue, or bad accelerator pump shot. Did you check that the timing mark on the damper is actually at TDC? What is the timing set for, with the vacuum advance disconnected, and at what RPM?

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170


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 Post subject: Re: I need a Carburetor
PostPosted: Tue May 23, 2023 5:18 am 
Offline
TBI Slant 6

Joined: Thu Sep 15, 2022 12:00 pm
Posts: 142
Car Model: 1963 Plymouth valiant
Timing is good.. Bad accel pump sounds like a possibility, I just have to figure out how to determine that.... thank you


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 Post subject: Re: I need a Carburetor
PostPosted: Tue May 23, 2023 6:39 am 
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SL6 Racer & Moderator
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Joined: Sat Oct 19, 2002 12:06 pm
Posts: 8515
Location: Silver Springs, Fl.
Car Model:
valleyguy wrote:
Timing is good..

"Timing is good", means nothing. what is "good"? 0 degrees, 5, 10, 15 ? Factory specked some slant sixes at 0 degrees, I have one slant that is at 15 degrees, and another about 10. But I do lean toward the accelerator pump.

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170


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 Post subject: Re: I need a Carburetor
PostPosted: Tue May 23, 2023 11:27 am 
Offline
TBI Slant 6

Joined: Thu Sep 15, 2022 12:00 pm
Posts: 142
Car Model: 1963 Plymouth valiant
Well I re=checked my timing and it is set a couple of degrees past "0 (My damper marks are only in 5 degrees increments); The shop manual says it should be 2 1/2 degrees BEFORE TDC: So I'm going to reset it andcheck again. Thanks


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 Post subject: Re: I need a Carburetor
PostPosted: Tue May 23, 2023 11:53 am 
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SL6 Racer & Moderator
User avatar

Joined: Sat Oct 19, 2002 12:06 pm
Posts: 8515
Location: Silver Springs, Fl.
Car Model:
valleyguy wrote:
Well I re=checked my timing and it is set a couple of degrees past "0 (My damper marks are only in 5 degrees increments); The shop manual says it should be 2 1/2 degrees BEFORE TDC: So I'm going to reset it andcheck again. Thanks

I would try setting it at about 5 degrees before TDC. as a starting point.

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170


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 Post subject: Re: I need a Carburetor
PostPosted: Tue May 23, 2023 7:26 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 8413
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Look down the carb and press the throttle down. Do you see a nice long squirt of fuel shoot into the carb? If not the accelerator pump is not working

As Charlie said go to a minimum 5 degrees before on your timing.

When was the last time the valves were adjusted.

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!
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12.70 @ 104.6
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 Post subject: Re: I need a Carburetor
PostPosted: Wed May 24, 2023 5:27 am 
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SL6 Racer & Moderator
User avatar

Joined: Sat Oct 19, 2002 12:06 pm
Posts: 8515
Location: Silver Springs, Fl.
Car Model:
Rick Covalt wrote:
Look down the carb and press the throttle down. Do you see a nice long squirt of fuel shoot into the carb? If not the accelerator pump is not working

.

Do this with the engine off. You might need your eyebrows. :lol: :lol:

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170


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 Post subject: Re: I need a Carburetor
PostPosted: Wed May 24, 2023 5:53 pm 
Offline
Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 8413
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Quote:
Do this with the engine off. You might need your eyebrows.


How do you know that Charlie! :D :D

_________________
2 Mopars come with Spark plug tubes. One is a world class, racing machine. The other is a 426 CI. boat anchor!
Image
12.70 @ 104.6
Image


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 Post subject: Re: I need a Carburetor
PostPosted: Wed May 24, 2023 7:17 pm 
Offline
SL6 Racer & Moderator
User avatar

Joined: Sat Oct 19, 2002 12:06 pm
Posts: 8515
Location: Silver Springs, Fl.
Car Model:
Rick Covalt wrote:
Quote:
Do this with the engine off. You might need your eyebrows.


How do you know that Charlie! :D :D

I won't tell. :wink: :wink:

_________________
Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 225 nitrous
64 Valiant Signet
64 Valiant 4dr 170


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