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Weber carbs?

 
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64ragtop
EFI Slant 6


Joined: 06 Feb 2005
Posts: 467
Location: South Austin, Texas

Post subject: Weber carbs? (Sun Oct 14, 2012 11:14 am) Reply with quote

Anyone running a Weber carb on a slant six? What carb - what manifold - what exhaust - installation hassles - performance/gas mileage - would you do it again??



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Mroldfart2u
EFI Slant 6


Joined: 02 Feb 2011
Posts: 495
Location: Amarillo, Tx USA

Post subject: (Sun Oct 14, 2012 12:10 pm) Reply with quote

Are you talking a bona fide Weber or the Eddy "Weber"?



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Joshua Skinner
Supercharged


Joined: 27 Jan 2005
Posts: 6951
Location: Portland, Oregon

Post subject: (Sun Oct 14, 2012 12:49 pm) Reply with quote

One Weber, two Webers or three?

Figure that with any non-stock carburetor you're doing some linkage fabrication. Improved exhaust systems benefit even the lowliest slant. Manifold heat is a good thing for a daily driver.



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olafla
Turbo EFI


Joined: 17 Jan 2006
Posts: 1569
Location: Oslo, Norway

Post subject: (Sun Oct 14, 2012 8:01 pm) Reply with quote

Hi 64ragtop, I made a query for 'weber' here in the forum using the 'search' button, and came up with 1382 hits. If you make a query that also include words that cover your specific questions, you will definitely find the answers. Weber has been a theme in many threads. Good luck! Very Happy

Olaf



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64ragtop
EFI Slant 6


Joined: 06 Feb 2005
Posts: 467
Location: South Austin, Texas

Post subject: (Sat Oct 20, 2012 12:03 am) Reply with quote

Joshua Skinner wrote:
One Weber, two Webers or three?

Figure that with any non-stock carburetor you're doing some linkage fabrication. Improved exhaust systems benefit even the lowliest slant. Manifold heat is a good thing for a daily driver.


I'm leaning toward a single 32-36 progressive on an Offy 4-barrel manifold (with adapter). Got Dutra "Dual Duals" on order, but the exhaust does not provide for manifold heat. The Offy does have a heat box under the plenum, so capturing some with a sheet metal arrangement is do-able. I live in Texas, and the temp rarely goes below 40 or so. Over a hundred is common from May thru October, and it's usually pretty dry. How badly do you think I need to heat the intake? I'm making this up as I go.

The rotating linkage on the / is interesting, but any carb change is gonna call for linkage fabrication. I've seen a bunch of brackets for that purpose, and I think I can figure out the "applied geometry" for throttle and kickdown.

Oh and Mroldfart2u, I've read an awful lot of bad about knockoff Webers, but nothing about the eddy Webers you mentioned. My intent is to go with the real thing.

ATB

BC



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tlrol
TBI Slant 6


Joined: 20 Feb 2008
Posts: 203
Location: Medical Lake, WA

Post subject: Webers (Sat Oct 20, 2012 8:32 am) Reply with quote

I run both a 32/36 and 38/38 DGES on my stock Slant Six. If I want to get a few more miles to the gallon I use the 32/36 and drive carefully. If I want more ummpphh the 38/38 goes on.

I am driving a 1982 Dodge D150 which uses a cable...therefore linkage wasn't an issue. If you are going to do this then do install an exhaust bung for a wide ban O2 sensor. With the wideband you can jet for near-stoichiometric fuel air ratio(s).

Probably the best all around choice is the 38/38. I had the chance to pick up two different Webers so I experimented to see what I liked best.

You MUST use a two barrel Super Six intake or you are wasting your money and time. You will need two adaptor plates, these come with the Weber kits generally. Bolt it together, commence tuning. If you swap manifolds use the thicker gaskets to prevent vacuum leaks...said leaks happen way to easy with stock gaskets.



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64ragtop
EFI Slant 6


Joined: 06 Feb 2005
Posts: 467
Location: South Austin, Texas

Post subject: Re: Webers (Sat Oct 20, 2012 6:15 pm) Reply with quote

tlrol wrote:
...If you are going to do this then do install an exhaust bung for a wide ban O2 sensor. With the wideband you can jet for near-stoichiometric fuel air ratio(s).....
....You MUST use a two barrel Super Six intake or you are wasting your money and time. You will need two adaptor plates, these come with the Weber kits generally. Bolt it together, commence tuning. If you swap manifolds use the thicker gaskets to prevent vacuum leaks...said leaks happen way to easy with stock gaskets.


Thanks for the reply, tirol, I'm always willing to learn from someone who has already been "beating the bushes" out in front of me. I was a radio station engineer in a previous life, and adjusting equipment for best performance still comes naturally.

The O2 sensor is in the plan, placed as near as possible to the engine, I think. Which brings up another question. With the Dutra dual duals do I want to place the sensor in one of the castings, or near where the two downpipes merge? (see http://www.dutra.org/doug/doug-sl6-exhaust/dual-duals/hyper-duals.jpg & here http://www.dutra.org/doug/doug-sl6-exhaust/dual-duals/hyper-duals-sm.jpg.

I don't quite understand your comment,
Quote:
MUST use a two barrel Super Six intake or you are wasting your money and time.
Is this because of sealing issues due to different flange thicknesses between the intake & exhaust manifolds, lack of manifold heat, or something else?? I don't know the thicknesses of the Dutra Duals flanges, and haven't measured the Offy. I do understand wanting both intake and exhaust flanges to be equal thickness for equal clamping pressure on both. As to the lack on manifold heat, Austin, Texas is generally warm (or friggin' HOT!! and fairly low in humidity. I've been reading about extra thick gaskets made in Australia, and some others that should help with that. I clearly recall the hassle of removing and installing the manifolds on my '74 A-100 van and those manifolds were bolted together. No way to do that with the Dutra setup.

That's all I can think of now, but please share your experience with me. The project is going to take a while to learn and acquire components, but I'll take all the knowledgeable input I can get. Thanks!

ATB

BC



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Early Dart Disorder (EDD) is real, and I've got it!
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Danarchy
Turbo EFI


Joined: 25 Mar 2009
Posts: 1121
Location: TEXAS

Post subject: (Sat Oct 20, 2012 7:11 pm) Reply with quote

Here's a Great Book on Weber Carbs.

http://www.ebay.com/itm/281000342120?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649



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