Pipemax headers build

[redliner]

Hey guys, I bought the pipemax header program and am going to build some mild steel fenderwell headers. To get the correct length I need, the collector will be angled back a bit but I really need to have a cut off, open, 90 degree tip. Will this cause a problem as the collector is not a straight shot but a 90 although cut almost right in the bend... kinda hard to explain. I just want to deflect it from blowing dust bowls at the Cordova Dragway I race at... I am going to a bit of money & time and do not want to screw up all my work with a tip that negates the entire process.... Any thoughts?

[NormS]

I've found that a collector can curve just like a primary tube, as long as you use mandrel bent tubing, so that the cross section stays the same through the curve. I've extended collector lengths many times, where a curved collector was necessary to miss something, like a frame rail or a cross member.
Use the largest radius of curvature on the collector curve as you can fit in, to maximize flow.

[redliner]

I've found that a collector can curve just like a primary tube, as long as you use mandrel bent tubing, so that the cross section stays the same through the curve. I've extended collector lengths many times, where a curved collector was necessary to miss something, like a frame rail or a cross member.
Use the largest radius of curvature on the collector curve as you can fit in, to maximize flow.

cool

[digger]

What c/l bend radius will it be?

[77cruiser]

4-2-1 or 4-1?

[redliner]

What c/l bend radius will it be?

I dont know the radius but I will be almost splitting the 90 in 1/2. Just enough to deflect exhaust back not down.

[redliner]

4-2-1 or 4-1?

4-1

[mk e]

The set I built for my frankenferrari has 4 of the 6 collects bent (2x 6-2-1), on a couple the whole thing is bent including the where the tubes merge together. I just matched up the centerline lengths and welded. The only down side I know of is it's more work t build.

Then the front bank need about 4-5 ft of pipe to get the muffler while the rear bank (transverse engine) needed under 1ft so the front got the choke expands to 3.5" pipe which then split in back for the 2 mufflers, the front tapers to 3" then splits to hopefully give similar pressure results, we'll see how that works out if I ever get it running well enough for the dyno, but my point is that you need exhaust so just do the best you can with the space you have.