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40 or 45 DCOE.....
Posted by: goatsnvairs ()
Date: December 28, 2017 05:12PM

.....for 180 turbo. I'm running B flow exhaust, F compressor. 180 heads, and meth/water. Thinking 45, but wondering if 40 might not be better for low end throttle...
I know some on this forum are running webers on their turbos, anyone tried both?

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Re: 40 or 45 DCOE.....
Posted by: 63turbo ()
Date: December 28, 2017 05:24PM

The only real difference between the 40 and the 45 DCOE is that the maximum
choke size that can be installed is larger on the 45 than on the 40. Theres no
difference in running when both carbs have the same choke sizes, but with the 40 there's less sizes to choose from. I ran a 45dcoe on my early turbo for years.

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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Re: 40 or 45 DCOE.....
Posted by: gnvair ()
Date: December 29, 2017 06:07AM

Don't limit yourself to the Webers. If you are trying for max power a Quadrajet will easily out flow a Weber. Even some of the 2 barrel carbs out there work really well.

Lee J

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Re: 40 or 45 DCOE.....
Posted by: goatsnvairs ()
Date: December 30, 2017 04:14PM

gnvair Wrote:
-------------------------------------------------------
> Don't limit yourself to the Webers. If you are
> trying for max power a Quadrajet will easily out
> flow a Weber. Even some of the 2 barrel carbs out
> there work really well.
Going to try and work the original style air cleaner into the arrangement so the side draft works well. Tks

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Re: 40 or 45 DCOE.....
Posted by: Seth Emerson ()
Date: December 30, 2017 09:23PM

Consider the "progressive-ized" Webers as well. A 45DCOE can act as a smaller carb until flow is needed. There are a couple of sources.

Seth Emerson

Check my new Performance Corvair Web site [www.perfvair.com]

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Re: 40 or 45 DCOE.....
Posted by: 63turbo ()
Date: January 01, 2018 07:24AM

I can vouch for the effectiveness of the vacuum actuated secondary modification
on DCOE carburetors. When dialing in a weber set up like that, normally the first thing you do after the install is to disconnect the secondary, and run the car on the primary side only so as to be safe and get the primary jetting good. On my car, a 32mm choke on the primary seemed to run approximately the same as the yh did... peak boost and throttle response was pretty close. I later found there was a slight hesitation with the 32mm if I smashed it hard enough... a 29mm cured that, although a 30mm probably would have ended up being
a better size for other reasons. When I was done tuning, with a 29mm primary and a 35mm secondary, I could get 18psi in 3rd gear, and the throttle response
was about as well can be done with a carb. With a 38mm choke and the same 29mm
primary, first and second gear boost were the same, but the boost in 3rd was now 20+ with no noticeable change in throttle response. Without doing the vacuum actuated secondary mod, now the two choke sizes have to add up to being about the same area as that single 32mm choke or you will start having throttle response problems, which is a kind of a waste of a carburetor. The stock Yh would be a better choice in that instance, as the DCOE's really aren't
designed to operate with chokes that small.

------------------------------------

Kevin Nash
Friday Harbor Washington
63 Spyder, Daily driver, EFI read about my project here: [corvaircenter.com]
first test start on EFI here:[www.youtube.com]
first official EFI boost test here:[www.youtube.com]
My new fan! [corvaircenter.com]
engine less 62 Spyder
Canadian 64 Monza Parts car



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