Oliver Klozoff Posted July 19, 2023 Report Share Posted July 19, 2023 Been working on this problem for a while... well more my dad then me, haven't been able to get to the garage in a while. Rebuilt Stromberg BXVD3 carb, New fuel system sans pump, points rotor etc. Vac is good. Put a manual choke on... I forget what else... Starts and idles perfectly but given throttle it bogs down. Cup your hand over the carb and revs fine. Pa thinks it just needs a new carb, thinks this one's "worn out and sucking air somehow" Any thoughts? Read my previous post about it giving me a hard time if you'd like... Thanks! Quote Link to comment Share on other sites More sharing options...
plymouthcranbrook Posted July 19, 2023 Report Share Posted July 19, 2023 Either fuel problem or vacuum leak. My 52 acted like that and when I replace the intake gasket it solved the problem. Quote Link to comment Share on other sites More sharing options...
Doug&Deb Posted July 19, 2023 Report Share Posted July 19, 2023 That’s odd that you have that carb on a Plymouth. That’s normally on a Dodge with fluid drive. Try this test. With the engine running spray carb cleaner around the base of the carb. If the idle picks up there is a leak. It could be worn throttle shaft bushings or a leak at the base gasket. Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 3 hours ago, Doug&Deb said: could be worn throttle shaft bushings Is there a way to replace these? I don't recall them coming in the rebuild kit. Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 3 hours ago, Doug&Deb said: That’s odd that you have that carb on a Plymouth. That’s normally on a Dodge with fluid drive Would this cause a problem on my engine? It's what the car came with. I also have the original carb, condition unknown. I'd have to rebuild it and test it. Fitment would require re-routing fuel lines. Quote Link to comment Share on other sites More sharing options...
Doug&Deb Posted July 19, 2023 Report Share Posted July 19, 2023 I’m not sure about the bushings. I’ve never had to replace them. I don’t think that carb would cause your problem. It has a dash pot that you don’t need with the manual transmission. It might be worth while to rebuild the original carb although you have to wonder why it was pulled in the first place. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 19, 2023 Report Share Posted July 19, 2023 if you having to choke the engine, (hand over throat of carb) then you have a restriction in your secondary system. Did this carb run good before? If you cannot answer that then maybe a rebuild of the original is in order as that SHOULD be the correct high speed jet. Quote Link to comment Share on other sites More sharing options...
uncleaud Posted July 19, 2023 Report Share Posted July 19, 2023 accelerator pump working? Quote Link to comment Share on other sites More sharing options...
TodFitch Posted July 19, 2023 Report Share Posted July 19, 2023 On my older B&B carburetor there is a "power circuit" which handles the transition from idle up. It is actuated by manifold vacuum through a passage through the mounting flange. When it wasn't working the symptoms were similar to what you describe. If the mounting gasket for the carburetor is installed wrong then a small hole that provides the vacuum can be blocked. I don't know if your Stromberg, or even later B&B carburetors have that. But if there is a small hole in the mounting flange of the carburetor there is likely supposed to be an equivalent hole on the gasket. 1 Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 19, 2023 Report Share Posted July 19, 2023 good point, this was just discussed a bit recently also.....the Stromberg as is in the Dodge manual is not anywhere near as well written as the Plymouth book and the Carter....but it does have a vacuum piston so yes, be aware you cannot block the vacuum source. Quote Link to comment Share on other sites More sharing options...
Hickory Posted July 19, 2023 Report Share Posted July 19, 2023 Good point and since it's the wrong carb make sure the intake has the cutout for the vacuum source Quote Link to comment Share on other sites More sharing options...
greg g Posted July 19, 2023 Report Share Posted July 19, 2023 If the power valve or step up isn't working it can ironically cause stumbles either from running too rich ( jet stays upen) or lean stumble (jet doesn't open). Only difference rich fouls plugs, makes black smoke, and gives terrible fuel mileage like 8 mpg or less. Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 4 hours ago, Plymouthy Adams said: you cannot block the vacuum source My Pa is on the phone right now, he said the manifold does NOT have any other holes for vac. Just the main intake hole. There IS however a hole on the Stromberg that was covered with the gasket we made. He also verified the Carter has a vac hole as well. He said earlier today it started and idled for about 20 mins and when he took the carb off it was pretty hot... vapor lock? Also, spraying around the carb did cause an increase in rpm. Whether that's a bad gasket or bushings as mentioned above has yet to be determined. He has the Stromberg off now, and there was somehow water in it... idk how. We had drained the tank day one and replaced all the fuel lines. Will check the fuel bowl. Pics of carbs and intake base: https://imgur.com/a/45qdygm One of yinz from western pa and not doing anything this weekend....? Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 15 minutes ago, greg g said: fouls plugs, makes black smoke, and gives terrible fuel mileage It doesn't smoke, and plugs don't seem fouled Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 (edited) Should we rebuild the Carter? Also, Pa mentioned an adapter and adding a 2b carb of some kind. Idk.... Is there a less costly carb option should we decide to completely replace the whole thing? So you think the Stromberg is workable? Edited July 19, 2023 by Oliver Klozoff Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 19, 2023 Report Share Posted July 19, 2023 (edited) you quoted me wrong, you CAN block the intake....the statement was "be aware you cannot bock the vacuum source" and expect it to work" sounds like you are not near the car, not doing the work and only reporting what is told without personal observations on your own. and the manner of most gaskets is that the manifold source is present by the very design of the gasket that does ensure no matter how you place the gasket the port on the carb base will be open to the manifold vacuum source...left, right, top, or bottom. Now if you or your pa made the gasket without regard for the port...I have no clue Look at your own pictures. The outline of the original gasket is clear on the intake with the 4 open slots so no matter what position you place it the gasket will port manifold vacuum to the small hole in the base of your pictured carb. Without that, you will not operate the power piston to enrichen the mix. Edited July 19, 2023 by Plymouthy Adams Quote Link to comment Share on other sites More sharing options...
Doug&Deb Posted July 19, 2023 Report Share Posted July 19, 2023 Any one barrel should bolt on but I would rebuild the original carb myself. Where in western Pa are you? I’m near Scenery Hill. Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 2 minutes ago, Doug&Deb said: Where in western Pa are you Grove city / slippery Rock area Quote Link to comment Share on other sites More sharing options...
Doug&Deb Posted July 19, 2023 Report Share Posted July 19, 2023 A bit north of me. Unfortunately I’m fighting a problem with my Dodge and that’s my weekend project or I’d be glad to help. Do you have access to another carb? Even if the linkage won’t hook up it might tell you something. Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 6 minutes ago, Plymouthy Adams said: you quoted me wrong, you CAN block the intake....the statement was "be aware you cannot bock the vacuum source and expect it to work" sounds like you are not near the car, not doing the work and only reporting what is told without personal observations on your own. and the manner of most gaskets is that the manifold source is present by the very design of the gasket that does insure no matter how you place the gasket the port on the carb base will be open to the manifold vacuum source...left, right, top, or bottom Now if you or your pa made the gasket without regard for the port...I have no clue Look at your own pictures. The outline of the original gasket is clear on the intake with the 4 open slots so no matter what position you place it the gasket will port manifold vacuum to the small hole in the base of your pictured carb. Without that, you will not operate the power piston to enrichen the mix. Ok I got you, idk the hole on the carb opened directly to the main intake ... thought you impled there was a second hole on the manifold. No I'm not there, the cars about an hour away at my parents, i can only get up there on the weekends and my dad isn't internet savvy enough to post here lol Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 (edited) 5 minutes ago, Doug&Deb said: A bit north of me. Unfortunately I’m fighting a problem with my Dodge and that’s my weekend project or I’d be glad to help. Do you have access to another carb? Even if the linkage won’t hook up it might tell you something. A quick jaunt up 79! Beers would be provided of course! Hes currently putting the Carter on, it's condition is unknown as it was just rolling around the trunk when I bought the car. Shouldn't take long lol Edited July 19, 2023 by Oliver Klozoff Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 19, 2023 Report Share Posted July 19, 2023 inform him please the gasket has to be thick original style that is slotted for the vacuum source....else..you are not installing properly and cannot expect different results even with original carb....the gasket must be correct. Quote Link to comment Share on other sites More sharing options...
Oliver Klozoff Posted July 19, 2023 Author Report Share Posted July 19, 2023 1 minute ago, Plymouthy Adams said: inform him please the gasket has to be thick original style that is slotted for the vacuum source....else..you are not installing properly and cannot expect different results even with original carb....the gasket must be correct. How thick was the original gasket? Bc the kit came with a rather thin one. Quote Link to comment Share on other sites More sharing options...
Plymouthy Adams Posted July 19, 2023 Report Share Posted July 19, 2023 rather thin and thick are not really descriptive in any exact manner, just suffice it to say when mounted the gasket must have the slots and when tightened, will not compress and or distort so to allow the gasket to squish and block the vacuum. Quote Link to comment Share on other sites More sharing options...
FarmerJon Posted July 19, 2023 Report Share Posted July 19, 2023 (edited) Felpro part number 8531 Replaces 637191 .120" thick Edited July 19, 2023 by FarmerJon 2 Quote Link to comment Share on other sites More sharing options...
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