Help with Carburetor! What hose is what?

jchochole

jchochole

Senior Member
I have a '57 Fairlane with a late model Motorcraft carb that I am struggling with to determine what hose goes where?

Can anyone snap some pics of their working carb and help me figure out where the vacuum advance hose attaches?

Thanks and here is my carb-

Appreciatively,
Jim
 

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With a single diaphram vacuum advance, you want to pick up a vacuum signal from below the throttle plates. Use a port that is in the carb. base.
 
I have the vacuum advance line, in the image, going into a port below the choke- is that correct? It is a base port- but is it the correct port?

Thanks,
Jim
 
Looking at your photo, that is where I would put it. Make sure that any unused vacuum ports are capped. Napa sells a cap assortment with several different size caps.
 
Thanks- good to hear. I have an oddly large sized port on the very top deck of the carb and another on the opposite side of the choke. Any ideas? My '57 air cleaner has zero hose attachments.

Thanks for the invaluable help!!!

Jim
 
i dont think you want to put the vacuum advance line below the throttle plates, if you do when the engine idles the vacuum will be at its greatest, it will fully advance the dist, and when you give the engine gas it will loose vacuum and cause the dist to retard, you want that line above the throttle plates, that way the vacuum will increase as you open the throtlle and advanve the timing, more throttle more vacuum advance
 
Ford1,
I will try attaching a pic of the throttle side of the carb- I have a port on the drivers' side below the throttle on the front of the carb, is that correct to attach the vacuum advance?

Thanks,
Jim
 

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you want the line connected to a port above the throttle plates, look at the port and it will be above the throttle, start the engine and put your finger over the port, at idle there will be no vacuum or very little, if your finger is pulled on pretty hard that a vacuum port for wipers or auto trans shifting control, find the port with no vaccum on it at idle wind engine up if the vacuum increases that where the dist advance goes ,leaving that port open will not effect engine idle, the port below the throttle plate will cause the engine to idle rough if left open and will have a sucking sound
 
The hose in the 1st picture is where you want to run you dist. vacuum advance from. Thats the port Ford used for advance since that carb came out until emission regulations. The port in the second pic was used in the emission era. Plug that one off and the one on top of the carb.
 
Your carb is a Motorcraft model 2150. In the second picture a circle can be seen on the side of the float bowl. What number is inside the circle? It is the venturi size of the carb, and helps assure a reasonable match between carb and engine size is made. Also in the second pic, the assembly with the spring is a bracket for the dashpot. Since no dashpot is present I would remove the bracket assembly. I have several 2150s in the barn, one complete with dashpot, choke pull off, etc. Will post a pic. I dont see the choke pull off in either of the pics. What is the tag number?
 
Here are a couple pics. The first shows the vacuum powered choke pull down. It operates on manifold vacuum, accessing the same channel in base as the PCV. The 2nd shot is a poor example of dashpot. Someone jerry-rigged it by using both an old mechanical pot and newer electrical unit, because they didnt have the right bracket.

2150.jpg


IMG_1876.jpg


I learned this week that the 2150 thermostatic/electric choke is designed to use electric plus hot air. The electric part is an assist, and is meant to have power from the alternator stator. Dont know the voltage requirement. You might consider replacing the electric cap with a nonelectric cap and spring. Set the choke to a "Lean" position. Or there are aftermarket electric caps available that use 12V power, and dont require hot air, in which case the hot air inlet to the housing would be plugged or capped.
 
Mike,.
According to the circle on the float side of my 2150- my venturi size is 1.21. My motor is a 292 V-8. How does that sound?
In regards to my last of dashpot, do I need one? I bought this '57 without one? What do you think?

Thanks,
Jim
 
jchochole said:
Mike,.
According to the circle on the float side of my 2150- my venturi size is 1.21. My motor is a 292 V-8. How does that sound?
In regards to my last of dashpot, do I need one? I bought this '57 without one? What do you think?

Thanks,
Jim
Click to expand...

Well, it doesnt sound too good. The 1.21s of the late 70's era were used on 351s, 400s, 360 engines. Guys have tried the 1.21 in the earlier 2100 series of Autolites and Motorcrafts on 289 302 engines and it doesnt work well. Bad gas mileage, poor low end performance, air fuel ratio too rich. I have used the 1.02, 1.08, and 1.14 2100 on my .060 over 292. The 1.08 and 1.14 are the best, with the originial equipment 1.02 being too small.

You will be happier with the smaller venturi, in Autolite carbs from 1964 to 1969. As for the dashpot, I have never used one.

Another equally satisfactory carb is the Holley 2300s. They are available new in 350 cfm size, or used rebuilt in 300 cfm size. I have a Holley 2bbl that was reportedly built for the Ford market in the late 70's, specifically as a replacement for the touchy 2150s.
 
Ahh crapola, that figures. Okay, well I am on a restoration budget and probably need a reliable carb.

Anyone out there have a spare working carb for sale?

Thanks,
Jim
 
The carbs are for IHC applications. One is governed so it is definitely not useable. The other with the manual choke probably would work. It was used on IHC 266 and 304 engines.
 
In your photos the large pipe on the top of the fuel bowl is a vent tube which was also a return for that weird charcoal canister that was used in emission control. I would think that plugging it up may cause problems. If your not hooking it up to anything connect a pipe to it and route it into the air cleaner so it can continue to act as a vent. I have heard instances where the vent tube is blocked and the carby then floods continually, though I would think it would cause lean mixtures due to odd pressure vacuum in the bowl
 
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