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Old 03-03-2016, 01:23 AM   #1
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Default 321 sch5 manifold

Finally got the time to play with all that material I bought! Built a manifold for a 76' Lancia Scorpion, and also my 95'. First one is of the Lancia Manifold.






For a 76' Lancia





Also the 76'


Here's a few shots of the mani I made for my car.



















I'm pretty happy with way it turned out. This was the first time I tried welding the collector on the inside and it went really well. To fit the runners I side the flange I designed and machined my own expansion tooling that I use in conjuction with a Harbor Frieght knockout punch cylinder.





Made from some S7 we had lying around.




My thinking with fitting the runners in the flange is that when you see a hot manifold it's always the runners glowing while the head flange is still dark and cool. Runners are trying to expand and the flange is staying put. When the pipe is placed on the flange and fillet welded all this expansion force is focused on the weld. I'm thinking my way will take a lot of stress off the weld. I'm excited to see how it holds up. I will of course be bracing the turbo.
Attached Thumbnails
321 sch5 manifold-80-20160120_192015_6153cb63c7a4b12f12f109deb65c735897061cc8.jpg   321 sch5 manifold-80-20160120_192001_af3c11d01a94c27cc2bf327da84d4f0b12aef2bf.jpg   321 sch5 manifold-80-20160302_183402_55a910dff6890912afc34b9d649ff5a3db1d77e9.jpg   321 sch5 manifold-80-20160302_183414_311571e8c991f36155cd38dcc0ea6d37cbe21e2a.jpg   321 sch5 manifold-80-20160302_183314_c6dde4a7cea8b1cef44542d0d0b0ce3b80b1d6aa.jpg  

321 sch5 manifold-80-20160302_141916_4927788ed991fcd80290db056f038110308ae935.jpg   321 sch5 manifold-80-20160229_215325_3d7e3b9a537240a3f0cbb7c22f4cd56651c07d88.jpg   321 sch5 manifold-80-20160226_151924_f266a0870f3f32468599e348699a09355d4b687a.jpg   321 sch5 manifold-80-20160226_150301_0c9f3740f94f5133656a946366b5d65ad6b1a2cf.jpg   321 sch5 manifold-80-20160226_151531_d782cee41bcab7ec059ae7c22f1fc4b02e7296b3.jpg  

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Old 03-03-2016, 01:26 AM   #2
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Very cool. I was wondering if you were ever going to put all that glorious metal to work.

Manifold lookin good too. Will turbo clear shelf tho? Looks kinda pushed out a tad much
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Old 03-03-2016, 01:29 AM   #3
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It's clears. I'll try to get some shoots with it in the car today.
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Old 03-03-2016, 01:31 AM   #4
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And thanks for the kind words. Funny thing is ended up buying more even fancier materials. I had custom bends with 1" long tangents made. Trying to expand an elbow with no straighe length to it is damn nears impossible!
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Old 03-03-2016, 01:46 AM   #5
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Sch5 would make me very nervous on track. Street car, I assume?
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Old 03-03-2016, 01:56 AM   #6
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I'm gonna beat the crap out of it everywhere I can, and see if it can take it. I'm still a ways out though. I'd even be open to the idea of shipping this to someone so they can put some laps on it for me!
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Old 03-03-2016, 12:37 PM   #7
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That expansion tooling is very, very nice. I would have loved something like that.
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Old 03-03-2016, 03:30 PM   #8
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Thanks TurboTim. I've gotta say I'm pretty pleased with it myself! Since I machined my own flange I was able to achieve a light tap fit between the runners and flange. I should add the total wieght of the manifold is 7.8lbs!
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Old 03-03-2016, 08:24 PM   #9
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SCH 5, thats 16ga for those who dont know. It'll be interesting to see how this holds up. See which camp was right on all those arguments back in the day, if its really just 304 sucking that causes our manifold problems or if we really just need all the beef.
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Old 03-03-2016, 09:23 PM   #10
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Quote:
Originally Posted by Leafy View Post
SCH 5, thats 16ga for those who dont know. It'll be interesting to see how this holds up. See which camp was right on all those arguments back in the day, if its really just 304 sucking that causes our manifold problems or if we really just need all the beef.
It's going on a street car, so it's apples to oranges.
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Old 03-03-2016, 10:23 PM   #11
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No this will not be a dedicated street car. It will most certainly be on road america with the north woods Shelby club. This year? Idk. Like I said I am as curious as anyone about the durability. I would be very open to the idea of shipping this to someone who can get it on the track and beat the poop out of it!
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Old 03-03-2016, 10:28 PM   #12
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Here is how it positions the turbo. My goal was to have it put the turbo in a place that would make the downpipe as straight as possible. A manifold like this will certainly need a good brace and that is next up on my list. I will design a support that keeps the turbo vibrating the same way the engine does so the manifold isnt trying to take that up. And also in a way that allows for thermal expansion. Prolly something like two plates clamped together with a Belleville spring.
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321 sch5 manifold-80-20160303_133814_f80bf9c180e304e9cd2397509b63dbef50eab27c.jpg  
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Old 03-05-2016, 03:19 PM   #13
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I really like this style manifold, runners stay relatively equal length, but short for good spool and better flowing then a log.
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Old 03-05-2016, 04:57 PM   #14
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Quote:
Originally Posted by ctdrftna View Post
I really like this style manifold, runners stay relatively equal length, but short for good spool and better flowing then a log.
It is very close to the one Turbotim built for me.
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Old 03-06-2016, 06:43 PM   #15
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I like how TurboTim angled the outer runners forward. Made them a little longer. My runners ended up being within 3/4" of each other his are likely closer.
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Old 03-06-2016, 06:53 PM   #16
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Tim's manifold was designed in CAD, so yeah, the runners are as close to perfectly equal as you can get. I asked him to design that for my old turbo car, but we never actually got around to getting one built.
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