Reinstalling Webber 4bbl on Eldebrock Aluminum intake

[Speakrdude]

I am reasembling a 94 5.7 w/Alpha's, and ran across a jusgement call. I was hoping I could get advise from you gentlemen.

On my engine, the factory used Webber 4 bbl carb's. I had to buy a new intake manifold and Eldebrock has them now for $177.00. (Yes, it's the kind that has the 4 middlebolt holes cantered at a downwrd angle.)

Anyway, The webbers sit on an adaptor plate made out of bake-o-lite plastic (or something) and uses an O-ring on the top and bottom.
Does that mean I should or should NOT use a paper gasket on either side?

I was planning on reusing the existing o-rings as I do not have any new ones.

your thoughts are appreciated....

 

[Bifflefan]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Use one or the other, not both. If the O-rings are old take them out and replace them or just use a new paper gasket. Old O-rings get flat on one side and they may not seal correctly again.

 

[Sharp Shooter]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

I am reasembling a 94 5.7 w/Alpha's, and ran across a jusgement call. I was hoping I could get advise from you gentlemen.

On my engine, the factory used Webber 4 bbl carb's. I had to buy a new intake manifold and Eldebrock has them now for $177.00. (Yes, it's the kind that has the 4 middlebolt holes cantered at a downwrd angle.)

Not sure what you mean by "middlebolt" holes...?

Anyway, The webbers sit on an adaptor plate made out of bake-o-lite plastic (or something) and uses an O-ring on the top and bottom.
Does that mean I should or should NOT use a paper gasket on either side?

Why is there an adapter plate? Is it a heat dissapater or an adapter? I'm just trying to figure out what purpose it serves. Isn't the weber carb the same as a Carter? Does it not fit the standard square bore opening found on the Edelbrock intake?



Posting pics would help your cause here and save all of us time.

 

[John_S]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

If it is a square bore to spread bore adapter, you probaly want to ditch it, assuming you bought a square bore intake. Merc used those adapters on low profile spread bore cast-iron intakes. If it is just a square bore heat isolater, keep it.

 

[Speakrdude]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Part of the throttle cable assembly and electronics, mount/bolt to the rear of the adaptor plate. I figured it was because the intakes were originally designed for Rochchesters, maybe not?

 

[John_S]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Part of the throttle cable assembly and electronics, mount/bolt to the rear of the adaptor plate. I figured it was because the intakes were originally designed for Rochchesters, maybe not?

Usually, the throttle bracket just goes over the two rear carb studs, ontop of the carb flange. Pictures?

 

[Speakrdude]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Here is what I purchased, painted and installed.

http://www.summitracing.com/parts/EDL-2104/?rtype=10

 

[Sharp Shooter]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Here is what I purchased, painted and installed.

http://www.summitracing.com/parts/EDL-2104/?rtype=10

That is a "spread bore" intake. Is your carburetor a "spread bore" or a "square bore"?

 

[Speakrdude]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Here is the Weber schematic from Mercruiser.

Part #21

http://www.mercruiserparts.com/Show...ARBURETOR/THROTTLE+LINKAGE+(WEBER+-+4+BARREL)

 

[Speakrdude]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Opps. Mine is the faded pic to the left. Part # 33 with #34 eing the o rings I mentioned

 

[Sharp Shooter]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Here is the Weber schematic from Mercruiser.

Part #21

http://www.mercruiserparts.com/Show...ARBURETOR/THROTTLE+LINKAGE+(WEBER+-+4+BARREL)

Ok, you have a spread bore intake and a square bore carburetor. Not sure why mercruiser would mix match their components like that but at least we know what you're working with now.

I would've bought the square flange intake and only if necessary maybe used a phenolic spacer in place of any adapter. That is irrelavent though...

In order to make a decision on the o-rings you need to take a close look at the mating surfaces between the intake spacer and carb. If they all look like they "match up" properly just put new orings in and go. if the old orings look ok you could give it a shot. If you end up with a vacuum leak (usually indicated by a higher than before idle) pull it back a part and put new orings in.

 

[John_S]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Edelbrock 2104 is a square bore and spread bore intake.

The schmatic looks like a spread bore to square bore adapter, which you don't need. Given it is phenelic, it probably provides some heat isolation as well. If you eliminate it, you might need shorter studs, and might have some heat soak vapor-lock. It would probably run fine, but might want to get a 4 hole phenolic spacer of the same thickness. Usually the local auto parts have them.

If you did not block off the egr passage, the intake will get hot, quicker than the cast iron.

The 0-rings will not work with that intake.


PS: Merc used those intakes because when the q-jets were discontinued, they went to the square bore webers. GM did not have a low profile cast iron intake. Cars/trucks were almost all fuel injection by then.

 

[Speakrdude]

Re: Reinstalling Webber 4bbl on Eldebrock Aluminum intake

Thanks for the input. I had to do some research on spread bore vs square bore and Now I understand.
I dont think Merc. used this setupvery long, but I happened to have a matched set.

Jim