carb change

Lyle

Lyle

Senior Member
I won't to upgrade the 52 ford to a mercury intake. Using a later model. 2bbl carb. How will I need to setup the distributor vaccum advance? Or use no vaccum to the distributor and depend on the distributors internal weights for advance. Am I wrong thinking that the later carb has the vaccum pulled from below the ventura and the flathead carb is pulled from above the ventura. In other words will I need to change distributor to another. Other than stock? If so what will need to be used?? Thanks PS. Found another running flathead ****** and all.
 
Lyle said:
I won't to upgrade the 52 ford to a mercury intake. Using a later model. 2bbl carb. How will I need to setup the distributor vaccum advance? Or use no vaccum to the distributor and depend on the distributors internal weights for advance. Am I wrong thinking that the later carb has the vaccum pulled from below the ventura and the flathead carb is pulled from above the ventura. In other words will I need to change distributor to another. Other than stock? If so what will need to be used?? Thanks PS. Found another running flathead ****** and all.
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Hey Lyle what did you do buy a whole case of canned worms.I wouldn't exactly call that an upgrade,your just asking for more troubles than you have now.OMO ken ct.:(
 
Lyle, Usually, folks install a 3 bolt Ford intake and carb on the Merc engine so as to eliminate the old "teapot" style 4 bolt Merc carburetor. Ken is correct.
 
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I've been told (by two diff engine builders) that a 4 bolt Merc intake w/2GC carb runs great - 100 extra cfm. This depends if you show your car or drive it. Check out Bubba's and others for distributor. We do run the risk of turning our car into modern marvals when the intent is to preserve them. Intakes are easy to remove for an original if you change your mind. Just my opinion.
 
The ignition swap, IF you get a distributor with a good curve, will give you more seat of the pants feel of improvement than anything with the carb. Even the specified curve for the Loadamatic is feeble, and they rarely meet specs.
 
Umm, I like my 2gc on Merc Manifold... And yeah I've been softly chided for the fact that it is not period correct... Works great tho... Have no reason to look for venturi vacuum sourse (spell check?) But it could be there ... Karl
 
The Mercury with the load-o-matic uses a vacuum source in the old teapot carb that is directed into the venturi to sense the actual air draw through the venturi more than the engine vacuum. It would be difficult or impossible to recreate the same low pressure air source using a Rochester 2G carb. I'm not sure how the distributor low pressure source is set up for the 2G or how adaptable it would be for say one of GMC Bubba's GM to flathead conversion distributors.

It would be great if some research could answer these questions but unfortunately a person finds themselves being the researcher that has to do the job. For a street motor it would be great to have a bolt on set up that could be dialed in for the combination of centrifugal and vacuum advance for the flat motors but there are too many variables like twin 97s VS Holley 94s or say a 2G Rochester like you mentioned plus the weak vacuum the flatmotor develops.

Kerby
 
I have thrown away 2 Mercury carbs. Well they are in the junk box. I don't care about perod correct it is going in a 29 roadster. Highboy. Change to. Flathead and. T5 s10 bronco rear end. All changed . Just was looking to use what I have on this 52 ford with headers and maby the carb change. Will give a little getup and go. Still trying to download spellcheck to this phone.I wish my fingers were smaller or phone larger. I am saving the big money for the 53 Mercury rebuild. I jumpd up here and bought. 2 more cars and another truck.with remodeling the houses 3 of them. I need to slow down a while.Can't work on them ecept one at a time.
 
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