"Sheet Metal" Intake Manifolds

earlymopar · Oct 5, 2012

I'm giving some thought to fabricating a sheet metal intake manifold but in my case for a V-8 with single 4 barrel. I've seen many multi-carb set ups done this way but never a single four for street use. If you've done it personally or have seen any I'd love to see some pictures (single four only). I have a few wrtie-ups on manifold design so I don't see any real difficult issues. My goal is to gain some inspiration from what others have done.

Thanks,

- EM

porknbeaner · Oct 5, 2012

Look for single carb pro stock cars.

I have a very old and unique pair of sheet metal manifolds, but it is a 2x4 divided plenum setup and probably won't work for you. Granted each manifold is for a single carb.

earlymopar · Oct 5, 2012

Love to see your pictures anyway if you have some. Yes, I added the words "street use" to my post as I know about those in use in drag racing.

- EM

porknbeaner · Oct 5, 2012

earlymopar said: ↑

Love to see your pictures anyway if you have some. Yes, I added the words "street use" to my post as I know about those in use in drag racing.

- EM
Click to expand...

Check your PMs.

Traditions Racing · Oct 5, 2012

He does ours, www.hogansracingmanifolds.com, one of the best in the world.

falcongeorge · Oct 5, 2012

What is the engine in question?

RichFox · Oct 5, 2012

Back in the day, there were some magazine articals about making a Ufab type manifold for three twos. I would think a four barrel would be about the same but with a different carb flange. of course if you want good fuel distribution that's a different and much more complicated story.

Rusty O'Toole · Oct 5, 2012

Why would you bother? 4 barrel manifolds are easy to get. The U fab type were inferior in some ways but at the time, the only way to get multi carb manifolds for some engines.

el Scotto · Oct 5, 2012

RichFox said: ↑

Back in the day, there were some magazine articals about making a Ufab type manifold for three twos. I would think a four barrel would be about the same but with a different carb flange. of course if you want good fuel distribution that's a different and much more complicated story.
Click to expand...

How to Make a U-Fab Style 6×2 Carb Intake Manifold

Flat Roy · Oct 5, 2012

I can't get pictures right now but I've seen at least two sheet metal fabed 4bbl intakes for a bracket racer and a very high HP boat. Both manifolds performed very well. I'm in the northwest also, maybe we can connect and I can introduce you to some guys that love to do that kind of stuff.

earlymopar · Oct 5, 2012

Thanks much for your replies fellas. I can’t get to the site often so apologize for the delay.

- Traditions: No kidding, those are 3-dimensional art, especially the welds.

- Falcongeorge: 318 polysphere . Common but not much was made at the time or is available now plus none of them were real efficient designs.

- Rich / Elscotto: Thanks for the input on UFab.

- Rusty: I think I answered your question.

- FlatRoy: Great input and idea. Would love to do that if the opportunity comes up!

- - EM

Blindmule · Oct 5, 2012

http://marcellamanifolds.net/

Flat Roy · Oct 5, 2012

PM me if you want

falcongeorge · Oct 6, 2012

earlymopar said: ↑

- Falcongeorge: 318 polysphere . Common but not much was made at the time or is available now plus none of them were real efficient designs.
Click to expand...

Ok well thats why I asked. Yes if you are trying to build a max effort single 4 bbl poly fabbing a sheet metal intake would be the way to go. Start by googling "Pipemax", it will be very helpful. The only thing I would question is why a single 4bbl? A properly designed tunnel ram would be easier to build, and if you use pipemax and some common sense, will make more power everywhere that matters.

Abomination · Oct 16, 2012

Weiand 7503s come up for sale on here all the time!
http://autos.dir.groups.yahoo.com/group/318poly/

If you have a 318 Poly, you really should join.

~Jason

Ratherman · Oct 16, 2012

Here is a picture of our Hogan...

Dolmetsch · Oct 16, 2012

Early 318 MMMMM I have one of those. Yes they could use a good manifold. And you are right the aftermarket ones are more or less ****.
Now if you have a four barrel intake the biggest problem is the plenum. I reworked mine on the mill but spent a couple of days doing it. Probably removed over a pound of chips. On the 318 you have to make a valley pan first so do that and get it out of the way. How to know what size of tubing will work? Take a piece of paper about 5 inches long. Glue the ends and insert the paper rolled up sort of into the cylinder head port. Spread it out so it is pressed against the walls of the port all around the opening and let the glue dry at least to the point it wont move on you. Remove the paper and let the glue dry. You now have a flexible gauge to chose tubing from . If you choose round tubing this paper roll will show you exactly what size tubing can be squared to fit the hole . Also works with square tubing. A perfect gauge.
Use a material YOU can work with. ie If you are good with steel build it from steel. If alumnum is your strength then go for it.
Yes Hogans is great but the cost of one manifold would rebuild a half dozen early 318s Ok so only three , never the less too expensive for this project. Can you do it? Certainly. Make a plan, buy a set of earplugs (so you cant hear the naysayers),lock the shop door and go for it. Nothing brings joy to a project like stuff you made yerself. A pleasure I might add the chequebook racers will never know. If Hogan can do so can you.
Don

Abomination · Oct 18, 2012

I've often thought of taking my P600 down to the Fab Lab - a lab owned by the local community college with 3D scanners, printers, and lathes. If I could get a few good 3D scans in, I could easily clean it up in Solidworks, "cut" the virtual intake apart in Solidworks and get the insides squared away, and then save it all on a DVD.

While I could take said DVD to any foundry and say "Make me one of these", or use Solidworks to enlarge the original intake to compensate for the shrinkage and 3D print a buck and sand cast it in the backyard, none of these are the most beautiful part: I could offer up my "intake on a DVD" as a download for FREE!

Anyone with Solidworks, Pro-E, AutoCAD, etc... hell, maybe even Google Sketchup... could download and manipulate, modify, etc one of the most coveted intakes for the 318 Poly at their whim. I'd offer it up free, in hopes that it would be a good start towards someone, somewhere coming up with something new for us 318 Poly guys.

Just a thought I've been milling over for a while.

I'd love to get my hands on a set of the Edelbrock finned valve covers to scan.

~Jason

Dolmetsch said: ↑

Early 318 MMMMM I have one of those. Yes they could use a good manifold. And you are right the aftermarket ones are more or less ****.
Now if you have a four barrel intake the biggest problem is the plenum. I reworked mine on the mill but spent a couple of days doing it. Probably removed over a pound of chips. On the 318 you have to make a valley pan first so do that and get it out of the way. How to know what size of tubing will work? Take a piece of paper about 5 inches long. Glue the ends and insert the paper rolled up sort of into the cylinder head port. Spread it out so it is pressed against the walls of the port all around the opening and let the glue dry at least to the point it wont move on you. Remove the paper and let the glue dry. You now have a flexible gauge to chose tubing from . If you choose round tubing this paper roll will show you exactly what size tubing can be squared to fit the hole . Also works with square tubing. A perfect gauge.
Use a material YOU can work with. ie If you are good with steel build it from steel. If alumnum is your strength then go for it.
Yes Hogans is great but the cost of one manifold would rebuild a half dozen early 318s Ok so only three , never the less too expensive for this project. Can you do it? Certainly. Make a plan, buy a set of earplugs (so you cant hear the naysayers),lock the shop door and go for it. Nothing brings joy to a project like stuff you made yerself. A pleasure I might add the chequebook racers will never know. If Hogan can do so can you.
Don
Click to expand...

Rusty O'Toole · Oct 18, 2012

Another approach to the problem is to adapt a manifold with similar port spacing off a different engine. You can buy adapters to bolt a Ford manifold onto a Chrysler engine similar to yours. I'm not saying this is the answer but might be worth looking into.

moonman29 · Oct 18, 2012

I would be interests in these files. I also am a fan of the poly 318 as I'm rebuilding one for my 66 satellite. I also have another one that was given to me for free that I would like to use in a future project. I have collected a few performance parts for these motor, but I have to agree part availability and choices a slim pickings. Anything we can do to make parts more available will help. Let me know if I can help with this project, I'd be more than glad to ***ist in any way, I am an ME by trade.

Abomination said: ↑

I've often thought of taking my P600 down to the Fab Lab - a lab owned by the local community college with 3D scanners, printers, and lathes. If I could get a few good 3D scans in, I could easily clean it up in Solidworks, "cut" the virtual intake apart in Solidworks and get the insides squared away, and then save it all on a DVD.

While I could take said DVD to any foundry and say "Make me one of these", or use Solidworks to enlarge the original intake to compensate for the shrinkage and 3D print a buck and sand cast it in the backyard, none of these are the most beautiful part: I could offer up my "intake on a DVD" as a download for FREE!

Anyone with Solidworks, Pro-E, AutoCAD, etc... hell, maybe even Google Sketchup... could download and manipulate, modify, etc one of the most coveted intakes for the 318 Poly at their whim. I'd offer it up free, in hopes that it would be a good start towards someone, somewhere coming up with something new for us 318 Poly guys.

Just a thought I've been milling over for a while.

I'd love to get my hands on a set of the Edelbrock finned valve covers to scan.

~Jason
Click to expand...

earlymopar · Oct 24, 2012

Rusty: I had been thinking about modifying existing manifolds to fit but I had no idea there were adapters. Who makes these? Kind of funny considering I'm modifying Ford headers to fit my poly!

- EM

Another approach to the problem is to adapt a manifold with similar port spacing off a different engine. You can buy adapters to bolt a Ford manifold onto a Chrysler engine similar to yours. I'm not saying this is the answer but might be worth looking into.

earlymopar · Oct 24, 2012

Ratherman:That is pure 3-Dimensional art! Gorgeous.

Here is a picture of our Hogan...

Rusty O'Toole · Oct 24, 2012

I don't know who makes the adapters but definitely saw them in some magazine a long time ago. Ford small block has similar port spacing to the Poly. The adapters were cut from aluminum 1" or so thick.

greg32 · Oct 26, 2012

Look at the Ramchargers car, High and Mighty. They made what is now a tunnel ram using what looks like radiator hoses for individual runners. You could put a single carb on top. It was a mopar, and would be correct to the time unlike a fabbed sheet metal modern looking intake. Just a thought.

FuelRoadster · Oct 26, 2012

Look around in the Incredible Welds thread here on the HAMB,,,pretty sure I saw some fabed sheet alum manifolds in there.

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"Sheet Metal" Intake Manifolds

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