2gc conversion

miniceptor86

miniceptor86

Senior Member
I am in the process of a 2gc carb conversion for my ‘51 Merc engine. I have the manifold and carb and I have some questions.

https://www.fordbarn.com/forum/picture.php?albumid=5694&pictureid=45262

https://www.fordbarn.com/forum/picture.php?albumid=5694&pictureid=45258

https://www.fordbarn.com/forum/picture.php?albumid=5694&pictureid=45261

https://www.fordbarn.com/forum/picture.php?albumid=5694&pictureid=45261

The manifold has the choke heat tube running through it. What is the neatest way of providing filtered air for the intake side?

Is a rubber tube sufficient for the outlet to the choke?

The carb has a Venturi vacuum port. Does the Loadomatic distributor need a metered rise of vacuum that might be different with this carb?

Oh and why silver instead of the Mercury green? It was only available in $42 quarts.
 
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Don't forget the Chev style distributor. The 2GC won't provide the correct signal to your load o matic
 
What vacuum signal does the loadomatic need? I understood it was Venturi vacuum, as opposed to manifold? Vacuum that increased with flow thru the carb.
 
Hmmm. I've put together 4 or 5 of these and was always able to match the carburetor with the choke system on the manifold. There are "divorced" chokes (with the choke mechanism on the manifold) and "regular" chokes (with the choke mechanism on the carburetor). It looks like your manifold is nether type (the '51 Merc engine in my '51 e has a "divorced" choke). I am no Mercury expert, but I have never seen one without a provision for an automatic choke. (Perhaps someone who knows will chime in here.)

It looks like you have the choke mechanism on the carburetor. On the ones of that type that I have, there is just a hole in the side of the manifold with a pressed in fitting that accepts a steel tube that goes to the carburetor; it's really pretty simple. Your pictures do not show the left side of the manifold, so I can't see if your Manifold has it or not. If I were in Minnesota, I could provide a picture of one of my setups, but, alas, I am condemned to spend the winter in the Florida Keys.

As for the silver paint on the manifold, that was either an attempt to make it more attractive for sale, or maybe an unsuccessful attempt to make it appear to be one of he desirable Canadian aluminum manifolds.

Oh yeah; the "Load-a-Matic" needs a special vacuum signal not provided by a 2G.
 
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The silver paint is what I had, that or black. The rest of the motor is ‘51 Mercury green which I could have matched with a $42 plus shipping quart of paint for which I most likely would have had no further us.

Yes the manifold has a tube going through the exhaust cross over below the floor of the intake directly under the carb. The carb choke has the fitting in the cover to connect to the manifold.
 
miniceptor86 said:
What vacuum signal does the loadomatic need? I understood it was Venturi vacuum, as opposed to manifold? Vacuum that increased with flow thru the carb.
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It was a combination of venturi suction and ported mainifold vacuum, depending on the pedal position. A max of only about 4" of vacuum was seen at the distributor at high RPM.

Sal
 
miniceptor86 said:
I am in the process of a 2gc carb conversion for my ‘51 Merc engine. I have the manifold and carb and I have some questions.


The manifold has the choke heat tube running through it. What is the neatest way of providing filtered air for the intake side?



I use a fuel filter to vent where I want a relatively small air flow...

Karl
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You must bore out the intake to match the throttle bore of the carb to reduce the turbulence of the miss mech and take ffull advantage of the 2GC carb.
Gramps
 
Thanks Karl.

Gramps I did that. I “machined” it on my drill press with a hole saw to increase the bore and off set the holes. I also made an aluminum spacer plate and cut out a second gasket
 
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ow I usually fill the PB vacuum port with JB weld or something similar for the third hole on some intakes like the early 33/34 camel backs for use on the 59 blocks or earner .
G
 
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During the “storm of a generation” I made some progress on the conversion. I have the carb mounted on the manifold, fuel line connected from the fuel pump and the PCV hooked up.
A couple of questions: since I got the wrong soft plug I made my own out of some Al I had. It’s a very snug fit, I tapped it in with a little JB weld. Noe I’m thinking the Al will expand more than the cast iron with heat and crack the manifold. Second with the old manifold off the valley sludge that I ignored last year has been exposed again. I didn’t do anything then but started to second guess my decision to leave it alone. Now that I see it again I have the urge to flush it out with diesel. Should I? Or shouldn’t I?
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In my opinion, with the engine in the car, if you disturb that mess it will go in the oil pan and get sucked up by the oil pump and pumped into the crank and cam bearings, even with the drain plug out, not all of it will end up running out. "Let sleeping dogs lie". Just my 2 cents. Merry Christmas to all
 
swedishsteel said:
In my opinion, with the engine in the car, if you disturb that mess it will go in the oil pan and get sucked up by the oil pump and pumped into the crank and cam bearings, even with the drain plug out, not all of it will end up running out. "Let sleeping dogs lie". Just my 2 cents. Merry Christmas to all
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Concur with The Swede, above!

Coop

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