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Old 11-13-2006, 09:33 PM   #1
mxv
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Default My manifold so far

here is my manifold design so far. wanted to go with somthing a little better than the tipical log style. hope it works out



the turbine inlet flange will be between cylinders 1 and 2
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Old 11-13-2006, 09:38 PM   #2
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looks decent to me, why did you decide to do it this way and not the traditional log style though?
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Old 11-13-2006, 09:40 PM   #3
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the differences are slight but theoretically it should help the spool rate and give a little more hp. not looking for a big improvment but i know its better
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Old 11-13-2006, 09:42 PM   #4
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Should look pretty nice when you get done with it, bet that was fun grinding out those angles.
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Old 11-13-2006, 09:45 PM   #5
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Should look pretty nice when you get done with it, bet that was fun grinding out those angles.
helllll no it wasnt
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Old 11-13-2006, 10:06 PM   #6
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yeah your b6 will spool alot quicker now that you have all th eexhauste routed back into it :gay:
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Old 11-13-2006, 10:33 PM   #7
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Default here is what i have

Look at the beautiful welds, they may be ugly, but they will hold. Not bad for my first time welding ever, as sad as that is.
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My manifold so far-dscf4499.jpg  
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Old 11-13-2006, 10:59 PM   #8
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Originally Posted by adbradley View Post
Look at the beautiful welds, they may be ugly, but they will hold. Not bad for my first time welding ever, as sad as that is.
I wish you wouldnt have ground them down, could have given you hints but from the little i see. Higher heat, play with the wire speed and slow down.
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Old 11-13-2006, 11:04 PM   #9
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You guys using stainless? I was just going to use sch.40 mild steel. Should last a long time,no?
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Old 11-13-2006, 11:11 PM   #10
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id love some tips loki, i will not grind the next ones down. My main issues was splatter, i need to buy some weld kleen, I am also using flux core only. Im gonna get some argon/co2 some time and do dual shield. The heat seemed fine, was burning through on some of the thinner parts.. my feed may have been a bit high.

200gs, im going all mild steel, the engine flange is a doner from a stock 1.6 manifold, the pipe is sch 40 black pipe, the elbows shown are stainless, but im going to buy some mild steel ones to use insted, i just happen to have those laying around.
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Old 11-13-2006, 11:25 PM   #11
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I did my whole manifold with flux core, mig i think is easier, but i love the point and click aspect of fluxcore and the ability to weld outside without shields. I used the **** that you dip the tip in to keep spatter down and it works decently well, and harbor fright or farm and fleet
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Old 11-13-2006, 11:33 PM   #12
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will have to try that, what type of welder do u use, i have a 180amp chicago electric from harbor freight, it was 600 new and i got it for 200 from a guy on craigs list, it was a great deal, had like no time on it, still had the price tag on it!!
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Old 11-14-2006, 12:23 AM   #13
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thread hijacking at its worse:gay:! never grind welds on manifolds only bad things can happen when you do that. that is the kind of design that i am trying to avoid. here it is half welded, cant weld the rest until i find the location for the inlet flange and cut the hole. should be done in a few days ill update then...

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Old 11-14-2006, 12:50 AM   #14
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nice welds, looks good!

do you think runner #2 should have face inwards towards runner #3 and #4 the flow can all meet into the center of the chamber and exit in the middle? As it is, it seems #2 and #1 will be disprutive of each other, plus #2 will flow weird turn.

All you have to do is flip it around correct?
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Old 11-14-2006, 02:07 AM   #15
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Arent the orifices on the backsides of those runners a little small? Youre going to end up with a ton of turbulence in the 4-3 and 3-2 section because the exhaust gas is going to squeeze down to fit through that small cutout and then expand again in the next section.

Youre going to end up with a restriction outside each cylinder instead of a single restriction at the turbine wheel- so your manifold will end up absorbing a lot of the "work" that should otherwise be driving the turbine- work that will be expressed as heat. And since it wont be even across all the entire head (1-2 cylinders will flow a ton better than the 3-4 IMO) you may end up with different EGT and knock characteristics between the front and back of the head.

The whole point of the non-log manifolds is that the exhaust pulses take an equal amount of time to directly reach the turbine instead of the cylinders dumping their pressure into a communal pool which empties into the turbine- your design doesnt bring the benefits of the equal length design and introduces complications that the internally smooth log design lacks.
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Old 11-14-2006, 02:45 AM   #16
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***** looking hot! BTW, nice ITB's in the back.
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Old 11-14-2006, 09:26 AM   #17
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Quote:
Originally Posted by getsidewaysd1 View Post
***** looking hot! BTW, nice ITB's in the back.
I was thinking the same thing. Gonna run the ITB's with the turbo? Sweet...

Who's flange?
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Old 11-14-2006, 03:22 PM   #18
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I'm going to be taking my XS Manifold and attempt something with that.
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Old 11-14-2006, 03:46 PM   #19
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Quote:
Originally Posted by beerslurpy View Post
Arent the orifices on the backsides of those runners a little small? Youre going to end up with a ton of turbulence in the 4-3 and 3-2 section because the exhaust gas is going to squeeze down to fit through that small cutout and then expand again in the next section.

The flow should already be turbulant I would be surprised if its not. I have given some thought to actually creating the most turbulant flow possible to increase heat transfer through the turbine.
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Old 11-14-2006, 04:53 PM   #20
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I read somewhere (I think it was autospeed) that the log style design with the center runners coming straight out, actually lessened the impact of the outside cylinders "aimed" at eachother. Making it sound as though log manifolds aren't built like that just because they're easy to build that way.
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