Slant Six Forum :: How to convert a 1bbl intake to a 2 bbl intake

Reed, for the carb question, my point is that i live in Europe and Carter BBD's are not the kind of things you find very easily...
I've got two downdraft weber carbs. They come from a 1.6L mild racing motor (or 1.5?...). We discussed that some time ago with dan and he told me not to mount them (i'll make my own intake of course) cause they'll be far too small.
The thing is : even one carb seem to be bigger (in throttle bore) than the stock carter bbs or holley 1920 i currently have.
Moreover, these motors used to get less than 20mpg which i assume is already anough for a 170 /6.
What do you think about it?
Thanks for your help

Marc

Yes, you can weld exhaust manifolds. I've done it with good success. The key is a clean surface, and for added insurance I heated the manifold cherry red in the location of the weld, and let `er rip. The heating was done so the weld and the manifold would cool at roughly the same rate. Grind a V notch so the bead will have some place to run, and drill a hole at each end of any crack so it can't spread.

I wonder, could you just smear JB Weld on it and bolt it down (with new holes, of course)?

Author:	marc426 [ Tue Jan 24, 2006 9:33 am ]
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Fiat Abarth or something... nothing less sure

Author:	Reed [ Tue Jan 24, 2006 10:02 am ]
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Quote: Reed, for the carb question, my point is that i live in Europe and Carter BBD's are not the kind of things you find very easily... I've got two downdraft weber carbs. They come from a 1.6L mild racing motor (or 1.5?...). We discussed that some time ago with dan and he told me not to mount them (i'll make my own intake of course) cause they'll be far too small. The thing is : even one carb seem to be bigger (in throttle bore) than the stock carter bbs or holley 1920 i currently have. Moreover, these motors used to get less than 20mpg which i assume is already anough for a 170 /6. What do you think about it? Thanks for your help Marc Well, I would agree that one carb would probably be too small considering that the 170 slant six is something like 3.0 liters. However, running two of those carbs might actually work out okay. You would have to create some sort of throttle and kickdown linkage, but that would be the hardest part (after making the intake manifold). I don't know much about Weber carbs, or Fiats, or dual carb setups, but it sounds like it might work. The key factor here is determining what airflow each carburetor is rated at. The BBD flowed 280 CFM, the Holley 1920 flows around 200 (I think) As long as the combined airflow of the carbs is equal to or greater than that of the stock carb you should be able to make it work. What would be most helpful is if you could post the model of Weber carb that you are trying to use and give some specifications such as one or two barrels, staged or synchronous opening throttle, CFM rating, etc...

Author:	Rust collector [ Tue Jan 24, 2006 10:14 am ]
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I have seen some wierd weber setups, from the factory. Like the 1.5l talbot, with a twin 40mm weber downdraft... I am pretty sure it would flow enough, but tuning it to work as it should on a slant may be interesting...

Author:	1966 dart wagon [ Tue Jan 24, 2006 11:07 am ]
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hmm and i was looking for a project to do that was metal related (welding class) at least it needs cutting....hm maybe i should try it for the hell of it i got 2 extra 1bbl intakes laying around. I also have a cracked ex manifold....can i weld it and make it usable(i probably wont but for something to do) can i tig weld it?

Author:	blue195 [ Tue Jan 24, 2006 3:13 pm ]
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...

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How to convert a 1bbl intake to a 2 bbl intake https://slantsix.org/forum/viewtopic.php?t=15873	Page 2 of 3

Author:	marc426 [ Wed Jan 25, 2006 1:23 am ]
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One thing i just couldn't figure : is the stock intake manifold such a good design? With those inequal runners all connected together, the pulses are always interfering with each other, right? For minimal interferences a 2*1bl. would be better, but does it need any plenum volume? What size?

Author:	Chuck [ Wed May 24, 2006 11:07 pm ]
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Blue195, The first page of this post would be much easier to read if you edited your picture down to a width of 420 pixels wide.

Author:	Reed [ Wed May 24, 2006 11:23 pm ]
Post subject:	Re: weldin' is fun
Quote: Yes, you can weld exhaust manifolds. I've done it with good success. The key is a clean surface, and for added insurance I heated the manifold cherry red in the location of the weld, and let `er rip. The heating was done so the weld and the manifold would cool at roughly the same rate. Grind a V notch so the bead will have some place to run, and drill a hole at each end of any crack so it can't spread. The way I have done it in the past is to take my 240 volt arc welder, set it on max, use a grinder to clean the manifold areas to be welded, then just laid on a big fat slow wled. The metal heats up quick and seems to bond well. Of course, I have never yet run the manifolds I repaired/fabricaed this way....

Author:	Joshie225 [ Tue Jul 03, 2007 5:56 pm ]
Post subject:	Dead thread resurrection!
I was bored today and made a big mess in the garage with a cutting torch, grinders and such. Still need to finish grinding the steel plate that will be welded to the cut open 1bbl intake, but then it's welding time.

Author:	DionR [ Wed Jul 04, 2007 11:10 am ]
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I wonder, could you just smear JB Weld on it and bolt it down (with new holes, of course)?

Author:	Caliente Valiante [ Wed Jul 04, 2007 10:25 pm ]
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Love me some a' dat JB Weld... fixed me a cracked cylinder wall in Don Garlits Swamp Rat XXXIV back in '61 wit it! LOL

Author:	icaneat50eggs [ Wed Jul 04, 2007 10:56 pm ]
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I think I would use some sealant instead of JB weld, just to help seal any potential leaks, The bolts should be enough to hold it in place.

Author:	Charrlie_S [ Thu Jul 05, 2007 4:30 am ]
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I did a homemade "torker" style 4 bbl manifold for a 273, back in the '70's. Was based on a stock 273 single plane 2 bbl manifold. Hogged out the top of the manifold, and "glued" on a open carb spacer (2" I think), with Decon Plastic Steel. It worked great. I still have it on the shelf. Any one want to buy it?

Author:	Joshie225 [ Thu Jul 05, 2007 10:40 am ]
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Quote: I wonder, could you just smear JB Weld on it and bolt it down (with new holes, of course)? Well, I don't roll like that. I can weld it so I will weld it.

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Author:	DionR [ Thu Jul 05, 2007 10:57 am ]
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That works. Your setup just got me to thinking about the spare 1bbl intake I have, but I can't weld (at least no on cast iron). So, will you be able to use the 1bbl throttle linkage on this, since it's turned 90 degrees to the Super Six setup?