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Carburetor question #6556198
06/15/19 12:35 PM
06/15/19 12:35 PM
Joined: Mar 2007
Posts: 35,124
McGrath, AK
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white17 Offline OP

"General (Mr.Sunshine) Washington"
white17  Offline OP

"General (Mr.Sunshine) Washington"
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McGrath, AK
Just replaced the carb on my '66 chevy p/u. It's a Rochester single bbl. Straight 6, 292 engine. The mixture screw was open 2.5 turns when I got it. I think that is way too much. The old one was set at approximately 3/4 turn open.

Anyone have a good guideline about what is close to correct for initial starting ?


Mean As Nails
Re: Carburetor question [Re: white17] #6556201
06/15/19 12:40 PM
06/15/19 12:40 PM
Joined: Dec 2006
Posts: 9,030
Coldspring Texas
Savell Online crying
"Wilbur"
Savell  Online Crying
"Wilbur"

Joined: Dec 2006
Posts: 9,030
Coldspring Texas
....turn that thing wide open and fill the tank with racing fuel..ride down to the icehouse, dump the clutch and pop a wheelie for the Eskimos


Insert profound nonsense here
Re: Carburetor question [Re: white17] #6556202
06/15/19 12:46 PM
06/15/19 12:46 PM
Joined: Dec 2006
Posts: 29,750
williamsburg ks
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danny clifton Offline
"Grumpy Old Man"
danny clifton  Offline
"Grumpy Old Man"
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Joined: Dec 2006
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williamsburg ks
I would always start with 2 turns. put a tach/dwell meter on and adjust for the fastest idle speed. set the ide speed srew and call it good.

Last edited by danny clifton; 06/15/19 12:47 PM.

Those who would give up essential liberty, to purchase a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin (1706-1790)
Re: Carburetor question [Re: white17] #6556205
06/15/19 12:48 PM
06/15/19 12:48 PM
Joined: Dec 2006
Posts: 19,927
SEPA
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Lugnut Offline
trapper
Lugnut  Offline
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Joined: Dec 2006
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SEPA
About one turn open was usually a good starting point for me.


Eh...wot?

Re: Carburetor question [Re: white17] #6556206
06/15/19 12:48 PM
06/15/19 12:48 PM
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williamsburg ks
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danny clifton Offline
"Grumpy Old Man"
danny clifton  Offline
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williamsburg ks
I should have included let it come up to operating temperature to adjust for fastest idle speed


Those who would give up essential liberty, to purchase a little temporary safety, deserve neither liberty nor safety. Benjamin Franklin (1706-1790)
Re: Carburetor question [Re: white17] #6556207
06/15/19 12:51 PM
06/15/19 12:51 PM
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Beatrice, NE
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loosegoose Offline
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Beatrice, NE
Engine warm, choke open, in park/neutral...screw the idle mixture screw in until it just seats. Don't crank it down or you'll ruin it and it'll never be right. Back it out 1 1/2 turns initially. Start it up and set idle speed. Now crank the mixture screw out slowly, the engine rpm should start going up. If it goes down, crank it in. Keep slowly turning it out as long as doing so raises RPM. At some point the RPM will decrease; at that point turn it back in 1/4 turn. Basically you're trying to get it adjusted to the point where it makes the highest RPM, because that is the point at which the engine is happiest. After you get the mixture set, you'll have to re-adjust idle speed.

Last edited by loosegoose; 06/15/19 12:51 PM.
Re: Carburetor question [Re: white17] #6556240
06/15/19 01:46 PM
06/15/19 01:46 PM
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Sandhills Nebraska
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Gary Benson Offline
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Sandhills Nebraska
I always thought 1 1/4 turns so it's in the ball park sounds like.


Life ain't supposed to be easy.
Re: Carburetor question [Re: white17] #6556546
06/15/19 10:21 PM
06/15/19 10:21 PM
Joined: Dec 2017
Posts: 258
Idaho
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old_newbie Offline
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old_newbie  Offline
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Joined: Dec 2017
Posts: 258
Idaho
If you have a vacuum gauge, plumb it into manifold vac. and adjust to greatest vac. at factory idle speed.


Member NTA, ITA, and USRTA
Re: Carburetor question [Re: white17] #6556549
06/15/19 10:27 PM
06/15/19 10:27 PM
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Posts: 68
North Carolina
JoeRJr Offline
trapper
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North Carolina
Please do what danny clifton said. Every vehicle and carburetor is different, so don't worry so much where you end up for adjustment. Anywhere between .5 turns and 2.5 turns out would be OK. I suspect you'll end up just about centered between those numbers.
Joe

Re: Carburetor question [Re: white17] #6556590
06/15/19 11:25 PM
06/15/19 11:25 PM
Joined: Nov 2011
Posts: 9,132
SWMo.
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tjm Offline
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SWMo.

Re: Carburetor question [Re: white17] #6556803
06/16/19 11:46 AM
06/16/19 11:46 AM
Joined: Mar 2007
Posts: 35,124
McGrath, AK
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white17 Offline OP

"General (Mr.Sunshine) Washington"
white17  Offline OP

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Thanks everyone . My internet connection quit right after I posted the question.

I don't have access to any instruments so I'll just have to go by ear. I'll try it at the current setting. If I can get it started I'll adjust from there.


Mean As Nails
Re: Carburetor question [Re: white17] #6556828
06/16/19 12:26 PM
06/16/19 12:26 PM
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USA MN
Snowpa Offline
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USA MN
O brother , mine always run the best about 1 3/4 turns out


Never Confuse Stupid With Crazy
Re: Carburetor question [Re: Savell] #6556835
06/16/19 12:45 PM
06/16/19 12:45 PM
Joined: Mar 2011
Posts: 11,440
Montana ,Rocky Mtns.
Sharon Offline
"American Honey"
Sharon  Offline
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Montana ,Rocky Mtns.
Originally Posted by Savell
....turn that thing wide open and fill the tank with racing fuel..ride down to the icehouse, dump the clutch and pop a wheelie for the Eskimos




grin You're a hoot, Savell

Re: Carburetor question [Re: white17] #6556841
06/16/19 12:58 PM
06/16/19 12:58 PM
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Posts: 19,689
pa
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hippie Offline
trapper
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It's only a stovebolt, nothing to worry about. grin

Re: Carburetor question [Re: white17] #6557861
06/17/19 11:49 PM
06/17/19 11:49 PM
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Posts: 35,124
McGrath, AK
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white17 Offline OP

"General (Mr.Sunshine) Washington"
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McGrath, AK
Got it running !! About 2 turns OPEN. Sounds great but that's because there's an exhaust leak !! laugh

But hey......... It's running and moves under its own power!!


Mean As Nails
Re: Carburetor question [Re: white17] #6557879
06/18/19 01:03 AM
06/18/19 01:03 AM
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Posts: 9,132
SWMo.
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tjm Offline
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SWMo.
2 turns is good, that is likely the single best carb & engine GM ever made. I can't believe the old one worked at all with 3/4 turns-

Re: Carburetor question [Re: white17] #6558101
06/18/19 01:14 PM
06/18/19 01:14 PM
Joined: Dec 2006
Posts: 1,656
idaho falls idaho
trapr Offline
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idaho falls idaho
Originally Posted by white17
Got it running !! About 2 turns OPEN. Sounds great but that's because there's an exhaust leak !! laugh

But hey......... It's running and moves under its own power!!

I don't think they call them leaks anymore, believe it is called a tuned exhaust.
it running and moving under its own power reminds me of someone of the boonies of Alaska, can't remember who though. smile

Re: Carburetor question [Re: white17] #6558125
06/18/19 02:00 PM
06/18/19 02:00 PM
Joined: Mar 2007
Posts: 35,124
McGrath, AK
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white17 Offline OP

"General (Mr.Sunshine) Washington"
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McGrath, AK
Hmmmm that comment sounds like a tuned exhaust laugh


tjm..... it was tough to start at that 3/4 setting but still seemed to be running rich. This one is much better!


Mean As Nails
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