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#860567 - Wed Jun 20 2012 05:42 AM Auto Choke carb  
Spotbiltxo  Offline
Shop Shark
Joined: Jun 2008
Posts: 902
San Antonio, Texas, USA
Picked up a Rochester single barrel carb with an auto choke on it at a swap meet. Can I use it on my 216 to replace the original Rochester B? I'm sure there's an adapter to be able to run the choke tube to the manifold, right?

Thanks!


Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
1938 Chevy coupe streetrod


#860569 - Wed Jun 20 2012 06:05 AM Re: Auto Choke carb [Re: Spotbiltxo]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,649
Dellrose, TN
As long as the stud spacing is right it will bolt on. Whether it's jetted right or not will be a crapshoot. Check out aftermarket "choke stove" listings to pick up manifold heat. The exhaust gas doesn't go to the carb, just air heated by passing over, or sometimes through the exhaust manifold.

I've seen an add-on heat exchanger that clamps onto the manifold with a couple of screw-type hose clamps, and a tube that routes the hot air to the choke housing. Simply wrapping a piece of copper tubing around the manifold a few turns and securing it with a couple of clamps also works.
Jerry


Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#860765 - Wed Jun 20 2012 11:38 PM Re: Auto Choke carb [Re: Spotbiltxo]  
tclederman  Offline
Joined: Sep 2001
Posts: 24,922
Jarvisburg, NC

This universal choke stove kit might work on a Rochester BC carburetor.


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 45 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your starter, either you, or your starter, or your engine, has a problem.

#860798 - Thu Jun 21 2012 02:20 AM Re: Auto Choke carb [Re: tclederman]  
Spotbiltxo  Offline
Shop Shark
Joined: Jun 2008
Posts: 902
San Antonio, Texas, USA
Thanks Jerry and Tim. I guess it's a crap shoot if it will work since I still don't know if this specific Rochester carb was ever intended to be used on a 216, but it's worth a try I guess.

Thanks again.


Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
1938 Chevy coupe streetrod

#860824 - Thu Jun 21 2012 03:47 AM Re: Auto Choke carb [Re: Spotbiltxo]  
Hotrod Lincoln  Online
Extreme Gabster
Joined: Feb 2004
Posts: 14,649
Dellrose, TN
If it's jetted for a 235, it will run lean on a 216. There's not enough venturi velocity to develop sufficient vacuum to pull enough fuel through the main jet. A bigger jet and/or a higher float level will help, but it's a balancing act on the float level between high enough to flow fuel, and a tiny bit higher that causes flooding. There's also a danger of keeping the power valve open all the time due to low manifold vacuum, which will result in lousy fuel mileage!
Jerry



Who says I live in a rough neighborhood- - - - -?
Just because I'm a tail gunner on a beer truck, maybe?

"He ain't even got a noddin' acquaintance with the truth- - -let alone a speakin' one!"


#860834 - Thu Jun 21 2012 04:22 AM Re: Auto Choke carb [Re: Hotrod Lincoln]  
Spotbiltxo  Offline
Shop Shark
Joined: Jun 2008
Posts: 902
San Antonio, Texas, USA
Okay Jerry........a dumb question. If the stud spacing is right and it bolts on can I assume it is for a 216 and therefore might be correctly jetted? Or were there different stud spacings for the 235's?


Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
1938 Chevy coupe streetrod

#860856 - Thu Jun 21 2012 05:28 AM Re: Auto Choke carb [Re: Spotbiltxo]  
tclederman  Offline
Joined: Sep 2001
Posts: 24,922
Jarvisburg, NC

Yes, it looks like there were two passenger carbs with automatic choke. One was for 50-52 Powerglide equipped cars, which would have had a 235 and the wider stud spacing. The other (7005060) was for 37-52 cars and would have been for a 216, with the smaller stud spacing. 1954 and later BC carbs would have been for 235 engines, all with the wider stud spacing.

I am not going to guess about 1953 non-Powerglide car engines and carbs' stud spacing.

http://chevy.oldcarmanualproject.com/1929_54chevyparts/03/200.HTM


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 45 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your starter, either you, or your starter, or your engine, has a problem.

#860866 - Thu Jun 21 2012 07:00 AM Re: Auto Choke carb [Re: tclederman]  
Spotbiltxo  Offline
Shop Shark
Joined: Jun 2008
Posts: 902
San Antonio, Texas, USA
Tim, So our trucks never came equipped with carbs with automatic chokes? If not then it's safe to say that this carb I have probably won't run right on my 216.

Oh well............

Thanks very much.


Chuck
1950 Chevy 1/2 ton
1951 Chevy 1/2 ton
1941 Chevy coupe
1938 Chevy coupe streetrod

#860894 - Thu Jun 21 2012 01:25 PM Re: Auto Choke carb [Re: Spotbiltxo]  
tclederman  Offline
Joined: Sep 2001
Posts: 24,922
Jarvisburg, NC

If its a 216 carb, it might work OK. Changing a carb in and out is not a difficult or tricky job, give it a try. If you have not rebuilt the carb, your biggest gamble is if it in working condition.



Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 45 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your starter, either you, or your starter, or your engine, has a problem.

#861328 - Sat Jun 23 2012 03:00 AM Re: Auto Choke carb [Re: tclederman]  
Kurt_51carryall  Offline
Shop Shark
Joined: Aug 2011
Posts: 889
Raleigh,NC
The 1953 non-powerglide car also had a 235 engine with auto choke, but had solid lifters.

Your truck should run fine with the automatic choke carb if it is for a 216. I ran my 235 powerglide engine for quite a few years with the auto choke before I found a good manual choke carb.

It's just so much more fun to work the choke and throttle, which is why I switched.

Kurt



Moderated by  53moneypit, Woogeroo 

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