CARB Question ....
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CARB Question ....
Well, I have went through some books and l am a little confused. I have a carborator that needs new jets. The truck came out of Colorado in the high country, and I am in Minnesota @ sea level. What jets do I need to get? I am a bit on the lost side .... Thanks in advance 
Cargo Master
Joined: Apr 2003
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Does it need new jets or are you just thinking it needs different jets to compensate. Different engines require different tunes at the same elevation. What worked for that other engine at higher elevation might work fine with your different engine at sea level. I'd bolt it on, run it and see how it works as is.
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Does it need new jets or are you just thinking it needs different jets to compensate. Different engines require different tunes at the same elevation. What worked for that other engine at higher elevation might work fine with your different engine at sea level. I'd bolt it on, run it and see how it works as is.
Postmaster
Joined: Jul 2003
Posts: 2,688
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From: Southern Oregon
More info sure would help. If it is an Autolite or Motorcraft carb requiring the larger Ford jets (compared to Holley), and different jets are really needed, this is the best deal anywhere for pairs. I ordered and received 5 pair at 5.25/pr, $6 shipping total. http://www.allcarbs.com/detail.php?g...27&stt=0&mfgn= . They may see demand more than expected thus driving up price. My suggestion is if you have for example 49s in place and think you need larger given spark plug reading, order 50 51 and 52. You can always sell off the excess parts, like to me. Autolite/Motorcraft carbs generally perform within +/- 2 jet sizes from standard.
All of this is of no consequence until you say what type carb, engine, and size of jets in place.
All of this is of no consequence until you say what type carb, engine, and size of jets in place.
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Cargo Master
Joined: Jul 2006
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From: Concord, CA
Since the truck came from a high altitude where you want a leaner jet then he would want a richer jet now at sea level. First the carb needs to opened so the size of the jets can be seen after the float is removed. Even at sea level the jets will vary depending on the venturi size of the carb for one example and engine size for two.
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[quote=tbm3fan;8763545]Since the truck came from a high altitude where you want a leaner jet then he would want a richer jet now at sea level. First the carb needs to opened so the size of the jets can be seen after the float is removed. Even at sea level the jets will vary depending on the venturi size of the carb for one example and engine size for two.[/quoteI
Thanks I cleaned up the carb today, and there is a tag on it. I can get the numbers after work. The engine is a 352. I plan on putting some time in on it Sunday, I am kinda booked til then through work. Plugs I have to pull, and replacing them is on the agenda so to speak. Thanks all for the help
Thanks I cleaned up the carb today, and there is a tag on it. I can get the numbers after work. The engine is a 352. I plan on putting some time in on it Sunday, I am kinda booked til then through work. Plugs I have to pull, and replacing them is on the agenda so to speak. Thanks all for the help
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CARB Question
CITF Y B5AC 31
On the drivers side of the carb itself is: 114
Sorry it took so long here,
Cargo Master
Joined: Jul 2006
Posts: 3,014
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From: Concord, CA
Ok, just your basic Autolite 2100 1.14 venturi carb. Are you going to open up and rebuild? Then when you remove the top plate and the float you will be able to see the two jets at the bottom. They will be marked with a number like 46, 48, 50 which indicates the size of the jet. I will tell you now that the smaller 1.08 carb, found on 289-302 engines would have had a 48F jet from the factory. Extrapolating from that a 1.14 on a 289 might have a 50 due to increased air flow. C1 indicates 1961 but my Autolite reference book from 1965 follows all C1 carbs with TE. Nonetheless, the most likely truck engine it was on would have been a 292 Y block.
Now about those jets. They are most likely in there pretty tight nowadays. Finding a jet tool to fit down in the fuel bowl is tough. The basic Holley tool definitely does not work as I tried. You will need a screwdriver with a 3/8 blade and no smaller or you will damge the tops of the brass jets. With the right blade you need to put strong down pressure while steadily turning the blade to loosen.
Now about those jets. They are most likely in there pretty tight nowadays. Finding a jet tool to fit down in the fuel bowl is tough. The basic Holley tool definitely does not work as I tried. You will need a screwdriver with a 3/8 blade and no smaller or you will damge the tops of the brass jets. With the right blade you need to put strong down pressure while steadily turning the blade to loosen.
Ford Parts Specialist
Joined: Nov 2006
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From: Simi Valley, CA
Are you sure the tag reads C1TF-Y? All I can find is is C1TE-Y.
If it is C1TE-Y, this is a 1V Holley carburetor.
C5TF-Y is a 2V Auto-Lite Carburetor.
B5AC 31: B = Design Change / 5AC = Assembled the third week (C) of January (A) 1965 (5) / 31 = Ford internal use only.
2) C3UZ9533A .. Jet #52F = 0-5,000 ft. (Motorcraft CJ133).
2) C3UZ9533C .. Jet #50F = 5,000-10,0000 ft. (Motorcraft CJ141).
2) C3UZ9533D .. kET #49F = 0-15,000 ft. (Motorcraft CJ142).
------------------------------------------------------------
Mike: A carb with a C1 prefix cannot be a Auto-Lite carburetor. as they were not introduced until 1962 (C2).
No 1961/65 carburetor has anything to do with T/E, which refers to Thermactor Emission (smog pump). T/E was not used until after 1/1/1966, and then only in F100's (& Passenger Cars) sold new in CA.
If it is C1TE-Y, this is a 1V Holley carburetor.
C5TF-Y is a 2V Auto-Lite Carburetor.
B5AC 31: B = Design Change / 5AC = Assembled the third week (C) of January (A) 1965 (5) / 31 = Ford internal use only.
2) C3UZ9533A .. Jet #52F = 0-5,000 ft. (Motorcraft CJ133).
2) C3UZ9533C .. Jet #50F = 5,000-10,0000 ft. (Motorcraft CJ141).
2) C3UZ9533D .. kET #49F = 0-15,000 ft. (Motorcraft CJ142).
------------------------------------------------------------
Originally Posted by tbm3fan
C1 indicates 1961.
No 1961/65 carburetor has anything to do with T/E, which refers to Thermactor Emission (smog pump). T/E was not used until after 1/1/1966, and then only in F100's (& Passenger Cars) sold new in CA.
Cargo Master
Joined: Jul 2006
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From: Concord, CA
I saw the C1 and knew that was a 1961 tag. Second, he said it was on a 352. Right there one would have to have, at a minimum, a 2bbl. carb. An Autolite since he said 1.14 was stamped into the side which Holley didn't do. Third, this tag was not in my Autolite Reference book from 1965 as they were all C1TE to start. Making it an E would put it in my book but the 1bbl wouldn't jive with the 352 engine he has. Switching it to a C5 would also be in my book and work for a 2bbl on a V8. So i figured the numbers may have been read wrong. As I said the tag indicated 1961 while the other info didn't mesh with the Autolite 2100 he has. What I now also know is that Autolite came onto the scene in 1962.
I do like those Jet specs that say a 52F for sea level to 5,000 feet and then a 49F from sea level to 15,000 feet. Is that a typo on the 49F which would be leaner at sea level than the 52F?
I do like those Jet specs that say a 52F for sea level to 5,000 feet and then a 49F from sea level to 15,000 feet. Is that a typo on the 49F which would be leaner at sea level than the 52F?
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Are you sure the tag reads C1TF-Y? All I can find is is C1TE-Y.
If it is C1TE-Y, this is a 1V Holley carburetor.
C5TF-Y is a 2V Auto-Lite Carburetor.
B5AC 31: B = Design Change / 5AC = Assembled the third week (C) of January (A) 1965 (5) / 31 = Ford internal use only.
2) C3UZ9533A .. Jet #52F = 0-5,000 ft. (Motorcraft CJ133).
2) C3UZ9533C .. Jet #50F = 5,000-10,0000 ft. (Motorcraft CJ141).
2) C3UZ9533D .. kET #49F = 0-15,000 ft. (Motorcraft CJ142).
------------------------------------------------------------
Mike: A carb with a C1 prefix cannot be a Auto-Lite carburetor. as they were not introduced until 1962 (C2).
No 1961/65 carburetor has anything to do with T/E, which refers to Thermactor Emission (smog pump). T/E was not used until after 1/1/1966, and then only in F100's (& Passenger Cars) sold new in CA.
If it is C1TE-Y, this is a 1V Holley carburetor.
C5TF-Y is a 2V Auto-Lite Carburetor.
B5AC 31: B = Design Change / 5AC = Assembled the third week (C) of January (A) 1965 (5) / 31 = Ford internal use only.
2) C3UZ9533A .. Jet #52F = 0-5,000 ft. (Motorcraft CJ133).
2) C3UZ9533C .. Jet #50F = 5,000-10,0000 ft. (Motorcraft CJ141).
2) C3UZ9533D .. kET #49F = 0-15,000 ft. (Motorcraft CJ142).
------------------------------------------------------------
Mike: A carb with a C1 prefix cannot be a Auto-Lite carburetor. as they were not introduced until 1962 (C2).
No 1961/65 carburetor has anything to do with T/E, which refers to Thermactor Emission (smog pump). T/E was not used until after 1/1/1966, and then only in F100's (& Passenger Cars) sold new in CA.
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