I'm building a turbo manifold for my 2JZ. I am going to do a divided t4 turbine flange. I have no problem building the rest of the manifold, but my band saw isn't accurate enough to make the two 3 into 1 collectors I need. Can anyone cut me a collector for this project? I'm looking for 1.5" sch10 304 SS.

I did a model in solidworks of approximately what I'm looking for. I dont need the wastegate tubes added. I'm looking for the collector cut but not welded. I'd like to do the welding on the complete manifold. :



Regards,
Justin

 

http://turbogoods.com/index.as...ID=46

i cant tell if the 3x2 collector on that site is divided, but it might be, i would say to try to get ahold of neukin and see

 

What length? And how soon do you need it?

 

Get some PVC pipe and figure it out with a chop saw, no need for a band saw for this... seems to simple and quick for a band saw.

 

I find it hard to believe your bandsaw can't cut this. I cut a 4 into 1 collector in the same arrangement as your 3 into 1. That cut is actually alot simpler than doing a standard collector design. Definitely at least try it in pvc and see for yourself...you should be able to get it.

 

Well, the tubes are about 5" long. I guess I'll give it a shot before I go buy one.

Justin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RC000E &raquo;</TD></TR><TR><TD CLASS="quote">I find it hard to believe your bandsaw can't cut this. I cut a 4 into 1 collector in the same arrangement as your 3 into 1. That cut is actually alot simpler than doing a standard collector design. Definitely at least try it in pvc and see for yourself...you should be able to get it.</TD></TR></TABLE>

Theres no comparing these collectors to a 4 cyl collector, 4cyl collectors are a cake walk, these are a lot harder. Theres some pics of the inside of one of my cummins manifolds which is the same thing as these, somewhere in one of my recent threads.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">

Theres no comparing these collectors to a 4 cyl collector, 4cyl collectors are a cake walk, these are a lot harder. Theres some pics of the inside of one of my cummins manifolds which is the same thing as these, somewhere in one of my recent threads.</TD></TR></TABLE>


wouldnt he really just be building like two three cyl collectors tho, due to it being divided and not needing the merging of the two rows of three.

 

Here's daves cummins manifold he's talking about. I was doing some modeling in SW last night. It looks to be fairly tough to match up the 1.5" sch 10 weld els up to the t4 turbine inlet. I ended up modeling the tubing up as I would have to crush it down to fit better. I'll post pictures shortly. I'm not sure how its going to all work out.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">Heres the last manifold I made for the baja1000 this year, this is for one of the main race trucks, we ceramic coated it in the bling finish. My supplier ran out of of the smooth 45* bends so the orange peel look on some parts is not the cerma coat but just rough weld el's.









Don't know how many of you guys have tried making 1.5"sch 40 collectors for split turbine on a 6cyl engine but its quite time consuming! I don't weld the inside of my collectors, The collectors are milled so the fitup is good, that said though I actually cut this specific collector with a dry cut saw.



</TD></TR></TABLE>

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dave@passenger &raquo;</TD></TR><TR><TD CLASS="quote">

Theres no comparing these collectors to a 4 cyl collector, 4cyl collectors are a cake walk, these are a lot harder. Theres some pics of the inside of one of my cummins manifolds which is the same thing as these, somewhere in one of my recent threads.</TD></TR></TABLE>

A cakewalk...I understand a 3 into 1 arrangement requires some different measurements than a 4 to 1 but how is one a cakewalk?

I just cut this one on my HF bandsaw and it is unwelded.





If I were doing a 3 to 1 I'd change the angle, that's a given, and I'd measure to be sure it matched the opening of the twin scroll. I don't see the cakewalk though...personally I feel these are a ton easier than the typical 4 to 1 style collectors because of the exact 90's required on each cut.

 

On my collectors I cut the 3-1, than cut the opposing angle between the two, than throw it in yet another jig on the mill and remove the material that sits on the divided or the flange to bring the two collectors nice and tight together. Its not impossible or anything theres just a lot more work and cuts involved than a 4-1 collector.

Oh and that style 4-1 collector above is not nearly as ideal for scavenging as a traditional radial style collector. I know the 6 cyl one on those cummins manifolds is the same splayed design but the difference between 3 or 4 cyls makes a difference on this style of collector.

 

Well, I didn't post it to discuss the scavenging characteristics between that style and a more traditional "radial" style collector. The application for which I made that requires a design like for logistical reasons, and having that is better than what is ordinarily used in aftermarket manifolds for that particular application. Like I said though, that is certainly beside the point.

The point at hand simply is, that that 4-1 style I made can be easily welded inside and out, all without several jigs and mills. In the end my inside finish will be just as good as yours, all from one single jig.

I'm not trying to get into some cockwar over collectors here, all I'm trying to say is a person wishing to build himself a twin scroll manifold with two 3-1 collectors can certainly make himself one, even on a cheap *** HF bandsaw like mine. My collector above proves that does it not?

 

Every time I look at one of these, I just wonder, where it is that you start welding, and in what order? There's some places on there that just aren't reachable to weld. Must be like solving a rubiks cube.

Some deep pockets you could just stuff the mig in there and hit it, but you can't TIG that deep stuff. Fascinating.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vectorsolid &raquo;</TD></TR><TR><TD CLASS="quote">There's some places on there that just aren't reachable to weld.

... but you can't TIG that deep stuff. Fascinating.</TD></TR></TABLE>

Says you.....

Small torches, gas lenses, and random runner removal are all ways to get what you want. I have full jigs for my manifolds, and the jigs allow you to be more flexibility when there are tight weld joints that need to be reached. Argon is also heavier than oxygen, so you can use that to your advantage in some situations.

Like pretty much anything out there, the more you do it, the more tricks and methods you come up with to make things come out nice.