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#839513 - Thu Mar 29 2012 02:25 AM Re: Dual carb Setup [Re: tclederman]  
54hydramaticFL  Offline
Shop Shark
Joined: Nov 2011
Posts: 160
miami, florida
Dave, sending you a PM



#839517 - Thu Mar 29 2012 02:34 AM Re: Dual carb Setup [Re: tclederman]  
54hydramaticFL  Offline
Shop Shark
Joined: Nov 2011
Posts: 160
miami, florida
Tim, I'm starting on a 261. Would like to know more about your rebuild/modifications to your's. Is that info on your site?


#839529 - Thu Mar 29 2012 03:18 AM Re: Dual carb Setup [Re: tclederman]  
pizza40  Offline
New Guy
Joined: Jul 2006
Posts: 23
Broomfield, Colorado
Originally Posted By tclederman

I have two Carter-Webers from Langdons on a 1960 261 in my Suburban. They are very well-behaved (to say the least) carbs but they are way "under rated" for my dual-exhaust .060-over-bored cylinders. They have good acceleration - better than one original Rochester. At high RPMs they are sluggish. They are very economical unless I really push them.

The dual original 261 Rochesters (different from 235 Rochesters) provide much more performance, not so much at the low end but considerably more power at high RPMs in each gear (and at higher speeds). These are a little more work to get and keep tuned but they are more fun to drive with.

I am no pro but I have friends who are pros (including race car mechanics). They feel the extra performance from the dual carb set ups.

Nonetheless, I have been looking for a good single carburetor, something like a Rochester 2GC for a 265 (probably too small) or for an early 283. I am ignorant about what to look for (and how to adapt the intake manual) but I am accumulating 2GC manuals and spec sheets and I interested in hearing any opinions.


I have a Roch 2-bbl 2GV up for auction just today on eBay. Do a search for "Rochester 2-bbl 7031714" and it'll come up. If your interested.

Last edited by pizza40; Thu Mar 29 2012 03:19 AM. Reason: forgot eBay

Pizza40

#839531 - Thu Mar 29 2012 03:21 AM Re: Dual carb Setup [Re: 53moneypit]  
pizza40  Offline
New Guy
Joined: Jul 2006
Posts: 23
Broomfield, Colorado
Great input! I do appreciate it. Thanks.


Pizza40

#839533 - Thu Mar 29 2012 03:32 AM Re: Dual carb Setup [Re: carbking]  
pizza40  Offline
New Guy
Joined: Jul 2006
Posts: 23
Broomfield, Colorado
Originally Posted By carbking
It IS possible to SLIGHTLY improve performance on a stock 235 by going to 2 carburetors IF ONE DOES IT PERFECT!!!!!

It is also quite possible to significantly LOSE PERFORMANCE if one does NOT do it perfectly!

On a stock 235 (no other modifications) the change could be from a minus 25 percent to a plus 10 percent, depending on ones homework and skill. Is it worth it? Each will have their own answer.

The following link will explain further:

http://www.thecarburetorshop.com/Dual1barrelcarbs.htm

And just because some company offers something for sale is absolutely NO guarantee that the product is beneficial to anyone other than the investors in the selling company!

And just to expand slightly on a comment by Jerry (HRL): we find that we virtually ALWAYS have to RICHEN the jets when going to multiple carbs. This is because of the reduced air velocity in the carbs. The novice will not account for the action of the power valve (which will need adjustment), and mistakenly thinks the carbs are too rich.

Jon.


Thanks Carb King. I was hoping you would chime in. Great article. I read and printed it out. I'm thinking now I might go with the 2 Carter 216 types. I have 2 YF 964S that I may use. I'll have to weld and redrill the bases, though. I'm guessing in your reply you meaan the pwr valve spring in a Roch B/BC will need a some of the turns clipped off. Do you have a starting point or is it trail & error?


Pizza40

#839592 - Thu Mar 29 2012 12:06 PM Re: Dual carb Setup [Re: pizza40]  
carbking  Offline
Shop Shark
Joined: Nov 2002
Posts: 1,640
Missouri
I would suggest building whatever carbs you decide on perfectly stock. This way you have a repeatable baseline.

As for cutting coils on springs, I don't. Of course we have lots of different springs to choose from, so not really a problem.

However, if you use the Carter YF's that you suggest you have; AFB spring kits (readily available) may be used in the the YF.

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]

#839651 - Thu Mar 29 2012 05:00 PM Re: Dual carb Setup [Re: carbking]  
pizza40  Offline
New Guy
Joined: Jul 2006
Posts: 23
Broomfield, Colorado
Originally Posted By carbking
I would suggest building whatever carbs you decide on perfectly stock. This way you have a repeatable baseline.

As for cutting coils on springs, I don't. Of course we have lots of different springs to choose from, so not really a problem.

However, if you use the Carter YF's that you suggest you have; AFB spring kits (readily available) may be used in the the YF.

Jon.


If I use the Carter's (for 216), what would I ask for to order spring kits from you. And are the Carter 964's a good choice or is there a better one to pair up? I know you won't give me a straight up answer but maybe a hint of sorts. grin


Pizza40

#839696 - Thu Mar 29 2012 08:22 PM Re: Dual carb Setup [Re: pizza40]  
carbking  Offline
Shop Shark
Joined: Nov 2002
Posts: 1,640
Missouri
Originally Posted By pizza40
[quote=carbking]I would suggest building whatever carbs you decide on perfectly stock. This way you have a repeatable baseline.

As for cutting coils on springs, I don't. Of course we have lots of different springs to choose from, so not really a problem.

However, if you use the Carter YF's that you suggest you have; AFB spring kits (readily available) may be used in the the YF.

Jon.


If I use the Carter's (for 216), what would I ask for to order spring kits from you. And are the Carter 964's a good choice or is there a better one to pair up? I know you won't give me a straight up answer but maybe a hint of sorts. grin [/quote]

We don't sell the AFB spring kits, but thank you for asking.

As to carburetors, since you asked; I highly recommend the Carter W-1 series. For your application, probably the 574s (1946~1948 Chevrolet 216). These have a mechanical power system (no need to retune for vacuum changes) plus they have leather accelerator pumps which are total impervious to ethanol based fuels.

The YF's will also work well, but require more tuning. Call if you need more assistance.

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]

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