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making a custom intake adapter for weber
Posted by: lugog ()
Date: July 15, 2011 09:48AM

What's an easy way to create a custom intake manifold? I have one dual barrel 48idf weber I want to hook up to the corvair crossover pipe. I was thinking fiberglass but I think the resin would break down from gas. Maybe take a pipe slice it on the end and weld it together smaller there. Ideas anyone? Just about given up on the stock carbs and my new weber would sing! Application is a dune buggy. Budget is cheap.

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Re: making a custom intake adapter for weber
Posted by: Am-Iron ()
Date: July 15, 2011 10:42AM

Are you thinking of mounting it to a turbo crossover? Maybe weld a couple of tubes to a 1/4" plate with the carb mounts drilled in it? I think those carburetors like to feed individual runners, so maybe you could modify the intake with a couple of bends that go up into a carb plate? It would help to see what you are talking about.

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Re: making a custom intake adapter for weber
Posted by: lugog ()
Date: July 15, 2011 10:59AM

[vesquared.com]

This is it.

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Re: making a custom intake adapter for weber
Posted by: MattNall ()
Date: July 15, 2011 11:18AM

Take a base gasket and make the plate....

Go to your local private exhaust shop.. and they will weld it up for you.





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: making a custom intake adapter for weber
Posted by: Scott V ()
Date: July 15, 2011 03:12PM

lugog Wrote:
-------------------------------------------------------
> What's an easy way to create a custom intake
> manifold? I have one dual barrel 48idf weber I
> want to hook up to the corvair crossover pipe.

before going to all that work - to find out it wont run too good w/that carb - maybe sell the 48idf & get a center mount 2bbl carb & maifold that was made for the vairs. these are around & cheap - seeing that cheap fits your needs.

id say it will cost you more to have a manifold made for the idf than you can get a used 2bbl carb & manifold. the $$ you get for the idf will just be $$ in your pocket.

-Scott V.

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Re: making a custom intake adapter for weber
Posted by: davemotohead ()
Date: July 15, 2011 03:24PM

I agree with Scott,, but sell the webber and get some good stock carbs because IMO the stock carbs work better than the 2bb centermount.





Email me at: Dave Motohead

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-----------------------------------
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Re: making a custom intake adapter for weber
Posted by: Danthesignman ()
Date: July 15, 2011 05:53PM

That definitely needs some sort of plenum under it like the 2bbl mounts have . It will run better that way . But I agree for a low buck trouble free solution sell it and use the money on 2 stock carbs . If the stock setup intimidates You just post Your questions and ask for help . You will get the most fun per $ out of a stock set up .

Winterset , Iowa

If You tell the truth , You don`t have to remember what You said .

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Re: making a custom intake adapter for weber
Posted by: Danthesignman ()
Date: July 15, 2011 05:59PM

Although.... I do have a Dellorto (same basic idea as a weber) DHLA daul 40 mm side draft on My chopper . I have this recurrent dream to make ( 2) 140 intakes and hang 2 40mm sidedrafts pointing towards the center of the motor . One for each bank and control them with some sort of cable .

Winterset , Iowa

If You tell the truth , You don`t have to remember what You said .

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Re: making a custom intake adapter for weber
Posted by: Chilly Willy ()
Date: July 15, 2011 06:05PM

Scott is right... the manifold will be the first of your problems. You will still have to dial in the weber. of course, after you figure out the linkage and fuel delivery issue.
you touched on the leaking throttle shafts. what is exactly the running problems with you're car ?



Edited 1 time(s). Last edit at 07/15/2011 06:06PM by Chilly Willy.

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Re: making a custom intake adapter for weber
Posted by: Danthesignman ()
Date: July 15, 2011 06:18PM

Oh , and tuning a Weber is a nightmare....took Me better part of a summer to get the Dellorto tuned . Sometimes cheaper isn`t worth the price You pay .
I just checked Ebay , if that 48 IDA is in good shape You could sell it and have enough money to buy a COMPLETE good used running set of stock carbs and linkage from someone on here . Just sayin`.... it`s cool , but not worth the hassle.


out.....

Winterset , Iowa

If You tell the truth , You don`t have to remember what You said .

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Re: making a custom intake adapter for weber
Posted by: lugog ()
Date: July 15, 2011 11:03PM

I can't sell the 48's because alternatively I would use them on my 302 but I don't want to spend the money on the intake manifold right now and I think I'd need two more 48's to complete the 302 setup...

I almost finished a custom intake manifold...I have no idea whether this is going to work, but seems like it might. The passage has some threads that the air will pass across. This might be problematic, but hey they sell the tornado which spins the air so maybe I'll get away with it.

A few complications yet.. Vacuum advance distributor - not sure where the right vacuum port is on the weber, there look to be lots of them. TV rod will need to work in some fashion.

Maybe I'll put this on ice. I have a girl I'm meeting up with tommorow and I want to give her a ride. Fixing the idle back would probably be doable a bit faster than getting this running. And like you guys pointed out I'm probably closer on figuring out the carb problem then creating an entire new setup.





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Re: making a custom intake adapter for weber
Posted by: lugog ()
Date: July 15, 2011 11:06PM

Working image links ->








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Re: making a custom intake adapter for weber
Posted by: lugog ()
Date: July 15, 2011 11:13PM

Chilly Willy Wrote:
-------------------------------------------------------
> Scott is right... the manifold will be the first
> of your problems. You will still have to dial in
> the weber. of course, after you figure out the
> linkage and fuel delivery issue.
> you touched on the leaking throttle shafts. what
> is exactly the running problems with you're car

I have a hard time getting a slow enough idle under 900rpm. around 900 half the engine runs a little rough. Latest problem was the right bank was not giving me hardly any fuel on the idle circuit, but I think this was because the idle set screw was set too high on it. I'll play with it again tomorrow and make a video maybe. I kind of have things all apart at the moment. Thanks for your offer to help. -Mike

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Re: making a custom intake adapter for weber
Posted by: j3m ()
Date: July 15, 2011 11:47PM

lugog
the idea that you have going with the threaded GAS pipe pieces seems decent.
The pipe itself is too heavy. Do the same with strong thinwall lightweight exhaust tubing, in the same context as the original tubing of the turbo crossover. I would consider making it a one piece intake and would place the carb dead center in the middle.

The GAS pipe is too heavy in my opinion and a one piece lightweight exhaust tubing construction would seem to better than using rubber boots & hose clamps, etc.

Seriously , with a Weber, you're gonna have to at least regulate your fuel delivery at 3.5 psi maximum. You'll be chasin' your tail if it gets fed a larger amount.

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Re: making a custom intake adapter for weber
Posted by: davemotohead ()
Date: July 16, 2011 10:20AM

Why did you not mount the carb in the center so both runners are the same length? thats why they call it a "center mount"confused smiley



Edited 1 time(s). Last edit at 07/16/2011 10:23AM by davemotohead.

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Re: making a custom intake adapter for weber
Posted by: SpyderMan ()
Date: July 16, 2011 11:14AM

Why is it so wide?

Sam Russell
Durham NC
1962 Monza Wagon
1964 Spyder coupe


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Re: making a custom intake adapter for weber
Posted by: lugog ()
Date: July 16, 2011 12:03PM

I haven't cut the pipes to the correct length yet. I'm bailing on finishing for now. I put the old carbs on. Did the two turns of the idle screw out on each side from full closed. Barely ran changed it to 3 turns and ran w a sputter. switched Carb sides and problem followed the Carb. If I spray Carb cleaner in the bad Carb it speeds up. No air leaks that I can tell. It has a New throttle shaft and seal kit. Blocked off choke, no vacuum advance on it. Sprayed all around and no speed change unless I spray into the Carb. I could keep it reved independently on that side so i know there is gas. So I think its a plugged idle circuit. Which I swear I had a problem like this before on the Carb I just switched out.I've done duals on vws before that's why its got me doubting corvair carbs with hows many problems I've had w them..

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Re: making a custom intake adapter for weber
Posted by: MattNall ()
Date: July 16, 2011 12:31PM

lug,, the carbs are simple... you are just not familiar with them... My 8 yr. old son was setting them up with no problems after he did few...then he moved to VW's and Webers..

This is why we stress it's so important to "hook up" with a knowledgeable Corvair mech.... usually found in the local chapter..

When I was young.. no one could afford a manual....it was all by experience...but in the 60's - 70's your neighbor had a few.... same with VW's..





MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

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Re: making a custom intake adapter for weber
Posted by: lugog ()
Date: July 16, 2011 12:47PM

Found two power enrichment needles in the one that wasn't running well.

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Re: making a custom intake adapter for weber
Posted by: lugog ()
Date: July 16, 2011 12:50PM

You should send your son over maybe he can finish my Weber setup. winking smiley

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