Ever seen a 2bbl carb with only ONE idle mixture screw?

[FinallyGot1]

Got the Eddy carb off my 383, put original 2bbl intake back on and original (but rebuilt) Carter carb on. Got the linkage sorted out and trying to tune the carb. Now the wrinkle: it APPEARS as though there's only ONE idle mixture screw....and it's at the REAR of the carb....and it's reverse threaded (i.e. clockwise brings it out and counterclockwise runs it in).

I can see the spots in the front of the carb where I'd EXPECT to see idle mixture screws but they're plugged. FSM doesn't mention this kind of setup and offers no help on initial adjustment for this single screw.

Anyone ever seen a BBD like this or do I have some hopelessly mutilated carb?
Idles really rough and rich but id does idle. Stumbles & tries to die when I touch the gas pedal but I did manage to drive it around the parking lot once before it died. I suspect idle tubes are clogged due to info found here: http://wiki.amcevolution.com/index.php/Curing_Carter_BBD_Carb_Issues
and I'll address that.
The idle mixture screw(s) thing has me puzzled though. Any help/suggestions appreciated.

 

[saylor]

my original carb had the 1 screw setup, and the reman from summit was a 2 screw version. we talked about it on this forum, i just gotta find the post . . . .

 

[FinallyGot1]

my original carb had the 1 screw setup, and the reman from summit was a 2 screw version. we talked about it on this forum, i just gotta find the post . . . .

Much appreciated if you can find it. I did a search but didn't have any luck.....wrong search terms I guess.

 

[cm23uoc]

http://www.forcbodiesonly.com/mopar...cement-PN-5-599-manual-or-vaccuum-choke/page4

This should be the thread I guess.

 

[saylor]

thanks man!

this one popped up too http://www.forcbodiesonly.com/mopar...od-access-plug-question&highlight=carb+saylor

i didn't see us talking about the 1-screw adjustment carb, which sucks. but we talk about setting the 2-screw adjustment carbs.

im pretty sure i sent mine back to summit as a core, so i cant go look at it, and i cant find any pics with the set screw.

bah.

 

[polara66hardtop]

I believe the single adjuster carb was a Stromberg. Last year for it was 67'?Chrysler used two brands, as they were switching over to the twin screw type.

 

[commando1]

I believe the single adjuster carb was a Stromberg. Last year for it was 67'?Chrysler used two brands, as they were switching over to the twin screw type.

My '67 has the original single screw Stromburg. Great carb.

 

[polara66hardtop]

They were good, too good apparently. Too reliable.

 

[FinallyGot1]

Thought it was a Carter. See if this clears things up.

 

[commando1]

Yep. That's the bendix stromberg WWC.
Should be stamped right on it.

 

[jct]

my carter bbd has the single mixture screw... i'm still fiddling with the choke spring some

 

[polara66hardtop]

The 383 Two barrels had a habit of plugging up the crossover, making the choke worthless,and hard to adjust at the very least. If the choke is acting up, then a cleaning is in order. The clean air act of 68 required the carbs to change. But, The Stromberg was very reliable.

 

[FinallyGot1]

No manufacturer identifiers of any kind on this carb. The metal tag that's on it says it's a Carter (according to the gurus at NAPA) and the gaskets in the rebuild kit I got look to be correct....for a Carter.

Now I'm wondering if the metal tag on the carb even goes with the carb it's on.

Anyway, Stromberg or Carter it needs to be running right by the weekend or it's coming off. I need to drive this car before the weather goes to hell and I know my Eddy carb works.....and I have a factory 4bbl manifold on hand to put it on......

Just getting tired of wrestling with this thing that should be pretty straightforward. It's frustrating and I'm tired of feeling so damn stupid.

 

[FinallyGot1]

my carter bbd has the single mixture screw... i'm still fiddling with the choke spring some

Any idea how many turns open I should set it for starters? Is it the same as the 2-screw models? I'm seeing 1/2 to 1 1/2 turns open for them.

 

[saylor]

i would do that and try to run the car, and see what you have.

if it hasnt run , be sure to have someone watching, for fuel leaks, while you are in the car. so you can shut it down fastly if needed.

crank it over and let us know what you got!

 

[FinallyGot1]

A friend of mine suggested I take the idle mixture screw out completely and blast some carb cleaner in there to see if I can clean out the idle tubes. (Engine off of course.) Then reinstall and adjust screw and fire it up.

It seems to run a little LESS cruddy when it warms up but still nowhere near driveable.

 

[saylor]

if that dont work, get you a rebuilt 599 carb from summit, bolt it on, and you will be driving by friday evening.

 

[FinallyGot1]

if that dont work, get you a rebuilt 599 carb from summit, bolt it on, and you will be driving by friday evening.

Going to check that out right now. Tyvm.

 

[polara66hardtop]

The venture is right inside the carb, vertical. Use the plastic tube that comes with the carb cleaner, and spray it directly in. You will have to look straight down, sort of awkward,but I do it while running all the time. Keep the engine on high idle while doing it, if it dies, just start it back up. It will take a second, but that will unplug the most Important part of the carb, if that is the problem. if you can't get to it easily, spray with the engine off, let it set for a minute, and start it up. if the Venturi if blocked, this will help. also, block off the vacuum hose, In case you have too much causing the engine to advance. The old strombergs had vacuum at an Idle. the newer carbs didn't.

 

[FinallyGot1]

The venture is right inside the carb, vertical. Use the plastic tube that comes with the carb cleaner, and spray it directly in. You will have to look straight down, sort of awkward,but I do it while running all the time. Keep the engine on high idle while doing it, if it dies, just start it back up. It will take a second, but that will unplug the most Important part of the carb, if that is the problem. if you can't get to it easily, spray with the engine off, let it set for a minute, and start it up. if the Venturi if blocked, this will help. also, block off the vacuum hose, In case you have too much causing the engine to advance. The old strombergs had vacuum at an Idle. the newer carbs didn't.

Venturi look clean. What I can't see is if there's anything clogging the idle circuit, hence the idea to shoot carb cleaner directly in through the idle screw hole.

Didn't know about the vacuum difference between the Strombergs and others. When I had my Eddy carb on this engine, I had the opportunity to try both ported (or venturi) vacuum and manifold vacuum. Car ran like crap on manifold vacuum but was very happy on ported vacuum.
I found that interesting as my Chevy prefers manifold vacuum. I don't understand it but it is what it is.