Cpt.Fred Posted February 17, 2011 Report Posted February 17, 2011 (edited) I just found out yesterday that i have bought the wrong carb by accident. now i have 2 carbs with 1 1/2" throttle and one with a slightly smaller one. the small one is marked 33-38 plymouth, and the bolt pattern of the foot is smaller as well. i didn't even know there was a difference between various pre war models, shame on me big trouble... i have various other carters here, most of them newer ones, all having the larger throttle bore and bolt pattern. can i just swap the lower part? what else is different on these models? thanks for any help on this topic...! fred Edited February 17, 2011 by Cpt.Fred Quote
Frank Elder Posted February 17, 2011 Report Posted February 17, 2011 So just make the smaller one your primary and the two larger ones your secondarys with progressive linkage....use what you got. Edit I forgot you aren't using a log type manifold...sorry. Quote
Cpt.Fred Posted February 17, 2011 Author Report Posted February 17, 2011 i don't build a progressive linkage, there will be no connection between the 3 carbs, so i need 3 of the same kind... Quote
greg g Posted February 17, 2011 Report Posted February 17, 2011 The smaller diameter carb was used on the smaller engine 198 and 201, and later as an economy option for taxis and other fleet cars. I think you could easily swap the base, however the main jet, and the step up jet are probably smaller also so I don;t thik that would work in combination with the other in your planned set up. Of you did choose to run a balance plenum between carbs and manifold the difference would probably ot be a issue. I can't state what the jet size differences were but it would probbly be enough to have the end cylinders runnig rich and the centers running lean. Quote
Reg Evans Posted February 17, 2011 Report Posted February 17, 2011 I have a bunch of the b & b's. What number are you looking for ? Quote
Cpt.Fred Posted February 17, 2011 Author Report Posted February 17, 2011 I think you could easily swap the base, however the main jet, and the step up jet are probably smaller also that's exactly my question... would be great if anyone had experience on this field here. i have to take them apart and check everything very carefully... my engine is a 201, 1940, and it came with the bigger carb version, stemped D6A2. Reg: i have one D6A1, one D6A2 and, the smaller one, a 439SH6. its foot is stamped B177. i guess i would need another A1 or A2 model... fred Quote
Reg Evans Posted February 17, 2011 Report Posted February 17, 2011 Reg: i have one D6A1, one D6A2 and, the smaller one, a 439SH6. its foot is stamped B177. i guess i would need another A1 or A2 model... fred Fred, Here are two D6A2's I have. If you can use one or both just PM me. They both need a rebuild. Both measure 1 9/16" at the throttle opening. Reg Quote
Cpt.Fred Posted February 25, 2011 Author Report Posted February 25, 2011 update: i just took the carbs apart and measured... the early version (or the one for the small engine) is completely different. the lower part with the throttle is smaller anyway, bolt pattern is different, float bowl is different in the draft tube area. step up jet, jet and full throttle pump seem to be the same, though. to whom it may concern... fred Quote
Reg Evans Posted February 25, 2011 Report Posted February 25, 2011 Fred, Are these the ones I sent ? Quote
Cpt.Fred Posted February 25, 2011 Author Report Posted February 25, 2011 oh, no, sorry... of course not! i meant the other ones, those i had before. i was just curious if i could reuse the float bowl... after all that carb is brand new and was... well let's just say... not exactly a steal:rolleyes: yours are still on the mail snail. that means they probably lie at the customs office and collect some dust. i hope i get them next week! cheers, fred Quote
claybill Posted February 26, 2011 Report Posted February 26, 2011 (edited) I went thru the carb thing last year, checking out numbers and jets etc....all measurements were the same 99% of the time inc all jets. the only difference was the choke location and the use of a different kind of lever here and there. i did not measure the early carbs or the economy versions as they were obviously different. d6a1 and 2 are identical as far as i can see. bill some desoto cars had a larger throttle diameter..but the main jet was the same in the one i checked. Edited February 26, 2011 by claybill spelling Quote
Cpt.Fred Posted February 26, 2011 Author Report Posted February 26, 2011 bill, thanks about the info on the jets! i hope i can make it all work with what i have here, or else we'd have to machine our own jets. a friend has built a measuring stand for jets, so i can check them all out and find 3 identical ones (experience shows most jets are different, even if they're named, numbered and appear the same). i still have to measure the thread size to see if i can fit them into the measuring apparatus. Quote
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.