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#82966 09/15/2007 1:24 AM | Joined: May 2005 Posts: 65 Wrench Fetcher | | Wrench Fetcher Joined: May 2005 Posts: 65 | How well would dual Rochester 2G carburetors work on 235 or 261? If 2 are too much for the engine how about one? Not worried about linkage or adapters to make the base fit, just function right now.
Bob
1950 Chevrolet 1300
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#82967 09/15/2007 2:50 AM | Joined: May 2005 Posts: 65 Wrench Fetcher | | Wrench Fetcher Joined: May 2005 Posts: 65 | Did another search and found a bit of info. Looks like mixed results, probably not the best carb for the application. Will keep looking for some suitable 1BBL carbs (not Rochester B) unless I give in first and buy the C/W's from Tom Langdon.
Did find a place selling Holley 847 1BBL carbs. They are supposed to be great carbs, anybody try running 2 of them on a 235 or 261?
Bob
1950 Chevrolet 1300
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#82968 09/15/2007 1:24 PM | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | The Rochester 2G series is a wonderful series of carburetors. If you pick carburetors of the proper SIZE, and fabricate a good intake manifold they will work extremely well.
If you pick the incorrect sized carbs, or use a "M squared" manifold; you will probably be less than pleased.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
#82969 09/15/2007 6:50 PM | Joined: Mar 2005 Posts: 1,513 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,513 | Originally posted by carbking:
The Rochester 2G series is a wonderful series of carburetors. [b]If you pick carburetors of the proper SIZE, and fabricate a good intake manifold they will work extremely well.
Jon. [/b] That's interesting Jon. What application or other specifics would one ask for in the 2G and how tall should the adapter be? Curt B.
1952 1300 Canadian 1/2 ton restomod You Tube | | |
#82970 09/15/2007 8:53 PM | Joined: Jun 2004 Posts: 8,597 Riding in the Passing Lane | | Riding in the Passing Lane Joined: Jun 2004 Posts: 8,597 | The 2GC carbs used on the old 283,s & 307,s were smaller then most of the others. They work good in multiple setups. They are scarce though. I'm accumulating some for my next project. 3 on a V-8.
They say money can't buy happiness. It can buy old Chevy trucks though. Same thing. 1972 Chevy c10 Cheyenne SuperIn the Gallery Forum | | |
#82971 09/16/2007 1:43 PM | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | Curt - Chrvrolet used a 2GC on the 265. Also, a number of V-6's in the 1970's used the 2-GC. In this case, smaller is better.
Adapter height??? Why use one??? First pick the carbs you are going to use and then FABRICATE A MANIFOLD TO FIT!!
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
#82972 09/16/2007 8:25 PM | Joined: Oct 2001 Posts: 3,458 Extreme Gabster | | Extreme Gabster Joined: Oct 2001 Posts: 3,458 | Some of the '66-71 V6 jeeps had Rochester 2G's on a Buick 225 V6 engine, this would probably match well.
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#82973 09/17/2007 2:15 PM | Joined: Mar 2005 Posts: 1,513 'Bolter | | 'Bolter Joined: Mar 2005 Posts: 1,513 | Originally posted by carbking:
Adapter height??? Why use one??? First pick the carbs you are going to use and then [b] FABRICATE A MANIFOLD TO FIT!!Jon. [/b] I was picturing them on an Offy or Fenton repop with a transition adapter. Is there an optimum height for velocity/atomization? Any reason they can't be extra tall?
1952 1300 Canadian 1/2 ton restomod You Tube | | |
#82974 09/17/2007 4:16 PM | Joined: Nov 2002 Posts: 2,766 Carburetion specialist | | Carburetion specialist Joined: Nov 2002 Posts: 2,766 | Curt - we did a LOT of research on the 2-barrel to 1-barrel adapters several years ago. We found the following to be true.
(A) under no circumstances would any two-barrel be an improvement over a single 1-barrel that was the proper size for the hole in the manifold.
(B) to minimize losses of using a two-barrel to one-barrel adapter, the adapter needed to be shaped for the transission, and at least 4 inches tall.
If possible, cut the one barrel mounting from the plenum area of the repop manifold, and heliarc a two-barrel flange that matches the carburetors of your choice into the plenum. Make certain that the flange is centered into the plenum, and that the plenum is sufficiently large to accept the two barrel flange.
If you simply want the two barrel(s) for looks and don't mind the loss of performance, go for it.
Probably need to qualify for what we were testing. We tested for an improvement in horsepower and/or driveability. We did not test for fuel economy.
Jon.
Good carburetion is fuelish hot airThe most expensive carburetor is the wrong one you attempt to modify. If you truly believe "one size fits all," try walking a mile in your spouse's shoes!The Carburetor Shop | | |
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