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Re: Getting Frustrated with Rochester B [Re: Matttttttttttttt] #1294032
Tue Jan 08 2019 03:30 PM
Tue Jan 08 2019 03:30 PM
G
Green_98  Offline
Shop Shark
Joined: Sep 2009
Posts: 113
Olive Branch (Memphis)
Jon G, that sounds like a good option, but I am going to be running a 261 shortly, and not sure if a Carter will provide sufficient air flow for it. I am tempted to experiment with Jerry's idea of the 258 AMC carb.


-Patrick
1953 Chevrolet 3100.
216/3 speed.Commercial Red.

Re: Getting Frustrated with Rochester B [Re: Matttttttttttttt] #1294034
Tue Jan 08 2019 03:41 PM
Tue Jan 08 2019 03:41 PM
H
Hotrod Lincoln  Online
Boltergeist
Joined: Feb 2004
Posts: 18,071
Dellrose, TN
Patrick, the 261 runs the same intake and exhaust manifolds as a 235 so swapping carbs might not produce a noticeable gain in performance RPM-wise. Finding one that's jetted for a similar cubic inch displacement engine would probably improve the low end and midrange performance, or at least provide a good starting point. The 261-specific Rochester B is a scarce item, and I'm sure it would have all the characteristic Rochester headaches as well.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Getting Frustrated with Rochester B [Re: Matttttttttttttt] #1294036
Tue Jan 08 2019 03:46 PM
Tue Jan 08 2019 03:46 PM
G
Green_98  Offline
Shop Shark
Joined: Sep 2009
Posts: 113
Olive Branch (Memphis)
I'm just looking for a "best, most reliable" option to use. I have a Rochester B (not the 261-specific) that will be used for now.


-Patrick
1953 Chevrolet 3100.
216/3 speed.Commercial Red.

Re: Getting Frustrated with Rochester B [Re: Green_98] #1294037
Tue Jan 08 2019 03:50 PM
Tue Jan 08 2019 03:50 PM
C
carbking  Offline
Carburetion specialist
Joined: Nov 2002
Posts: 1,786
Missouri
Originally Posted by Green_98
I'm just looking for a "best, most reliable" option to use. I have a Rochester B (not the 261-specific) that will be used for now.


This would be either a Stromberg or a Zenith. In addition to adjectives "best" and "most reliable", you can also add "most expensive".

Jon.


Good carburetion is fuelish hot air
The 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!
[image]http://www.thecarburetorshop.com/Avatar.jpg[/image]
Re: Getting Frustrated with Rochester B [Re: Matttttttttttttt] #1294079
Wed Jan 09 2019 12:20 AM
Wed Jan 09 2019 12:20 AM
J
Jon G  Offline
Shop Shark
Joined: Mar 2014
Posts: 837
Dallas, TX
Or a Carter 3211s. That is a very nice carburetor with an automatic choke and occasionally one shows up on eBay.


Jon

1952 1/2 ton with 1959 235
T5 with 3.07 rear end
Re: Getting Frustrated with Rochester B [Re: Matttttttttttttt] #1294199
Thu Jan 10 2019 03:32 AM
Thu Jan 10 2019 03:32 AM
M
Matttttttttttttt  Offline OP
Wrench Fetcher
Joined: Nov 2018
Posts: 26
Chino Hills, CA
Lots of good info. Live and learn I guess. I found a local shop that advertises that they work on Rochester B carbs. They discussed the warping concerns with me and said they know how to repair it. Hopefully I'm on the right track. I'm bummed the first carb that came with the truck is long gone.

Second question. I asked about a port on the side of the carb. He explained thay it was a vacuum like that attaches to the distributor. I told him one was never plugged in. I looked at a bunch of pics online and looked at my truck again. The mentioned line from the distributor runs to a port on the intake. If that is correct, what is done to the port on the carb?

Attached a pic, also here is a video of me following the line.
https://youtu.be/9xuj7CKuoO0

Attached Files
20190109_191949.jpg (109 downloads)

1963 C10 Fleetside Long Bed; 230; 3 speed; gun rack.
Re: Getting Frustrated with Rochester B [Re: Jon G] #1294200
Thu Jan 10 2019 03:35 AM
Thu Jan 10 2019 03:35 AM
M
Matttttttttttttt  Offline OP
Wrench Fetcher
Joined: Nov 2018
Posts: 26
Chino Hills, CA
Its a 1963 230. Manual choke. I drive it on the weekends, but that's about it....


1963 C10 Fleetside Long Bed; 230; 3 speed; gun rack.
Re: Getting Frustrated with Rochester B [Re: Matttttttttttttt] #1294295
Thu Jan 10 2019 08:07 PM
Thu Jan 10 2019 08:07 PM
V
Volfandt  Offline
Shop Shark
Joined: Aug 2012
Posts: 1,603
Knox County, TN
The proper vacuum feed to the distributor vacuum advance is almost always taken off the carburetors "controlled" vacuum port. This vacuum port can usually be identified as being slightly below the throttle plate cross shaft. Basic operation:

1) At idle the throttle plate is nearly closed, cracked just enough to allow "some" air to pass through the venturi to mix with the low speed/idle port fuel mixture. There's very little vacuum present below the throttle plate so NO vacuum is passed to the distributor's vacuum advance. You don't need timing advanced at idle.
2) As the throttle is opened, vacuum is generated under the throttle plate which is then applied to the distributors vacuum advance which activates it (advances timing)
3) Vacuum will continue with increasing RPM until the throttle plate hits a certain degree of open when the vacuum under the plate ceases to be enough to operate the distributors vacuum advance. This is OK as the mechanical advance has taken over by then.

Vacuum advance is off at idle, begins to advance timing at low speeds to mid speed then drops away at higher RPM and/or acceleration.

The vacuum for your distributor should come off of the control port on the dist and not from the manifold as it probably provides vacuum at idle (not needed) and at higher RPM when the mechanical advance should have timing advance control.

Easy way to determine which is the control port is by placing your finger over the port, at idle there should be no vacuum (suction), open the throttle a little and you should feel vacuum (suction)..

Re: Getting Frustrated with Rochester B [Re: Matttttttttttttt] #1294442
Fri Jan 11 2019 09:06 PM
Fri Jan 11 2019 09:06 PM
D
drdoug  Offline
Wrench Fetcher
Joined: Aug 2018
Posts: 46
Prosper, TX
FWIW, I have had good luck with replacing the Rochester B/BCs due to recurring leak/warpage issues with the Chevy-spec code 14-xx Stromberg carburetors (BXDV-3 or BXV-3s) on 235s, and using BXOV-2s on the 216s. The nice thing is they have leather accelerator pump seals, so will last better with ethanol (E10) fuel, to Jon G's earlier comments. The Stromberg's pop up regularly on eBay, sometimes well priced, and sometimes at ridiculous prices.

Many times, I've found NOS or old-rebuilt Stromberg carbs at very good prices, just takes some shopping and patience. It's getting much harder to find BXOV-2s that are good and affordable, especially if they are the later 1-5/32 venturi models. Earlier 1-3/32 venturi models are still fairly available.

I have a bit less experience with the older Carter OE carbs, but the W-1s seem pretty bullet proof. The Carter WEs seem viable as an alternative, and I've used some of the fairly common 730s replacement carbs with pretty good results.

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