Pipemax headers build

General engine tech -- Drag Racing to Circle Track

Moderator: Team

Post Reply
redliner
Expert
Expert
Posts: 670
Joined: Sun Feb 26, 2012 4:07 pm

Pipemax headers build

Post by redliner » Thu Feb 08, 2018 5:51 pm

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
Member
Member
Posts: 153
Joined: Sun Dec 13, 2015 10:21 am
Location: Vassar,Michigan
Contact:

Re: Pipemax headers build

Post by NormS » Thu Feb 08, 2018 6:45 pm

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.
Competition Fuel Systems Vassar, MI. www.compfuelsystems.com 520-241-2787

redliner
Expert
Expert
Posts: 670
Joined: Sun Feb 26, 2012 4:07 pm

Re: Pipemax headers build

Post by redliner » Thu Feb 08, 2018 8:20 pm

NormS wrote:
Thu Feb 08, 2018 6:45 pm
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
Guru
Guru
Posts: 1113
Joined: Sun Jan 27, 2008 6:39 am

Re: Pipemax headers build

Post by digger » Fri Feb 09, 2018 1:32 am

What c/l bend radius will it be?

77cruiser
Guru
Guru
Posts: 1011
Joined: Fri Dec 29, 2006 10:32 pm
Location: I Falls MN
Contact:

Re: Pipemax headers build

Post by 77cruiser » Sat Feb 10, 2018 7:04 am

4-2-1 or 4-1?
Jim

redliner
Expert
Expert
Posts: 670
Joined: Sun Feb 26, 2012 4:07 pm

Re: Pipemax headers build

Post by redliner » Sat Feb 10, 2018 8:12 am

digger wrote:
Fri Feb 09, 2018 1:32 am
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
Expert
Expert
Posts: 670
Joined: Sun Feb 26, 2012 4:07 pm

Re: Pipemax headers build

Post by redliner » Sat Feb 10, 2018 8:12 am

77cruiser wrote:
Sat Feb 10, 2018 7:04 am
4-2-1 or 4-1?
4-1

mk e
Guru
Guru
Posts: 3073
Joined: Mon Sep 17, 2012 3:19 pm
Location: Elverson, PA

Re: Pipemax headers build

Post by mk e » Sat Feb 10, 2018 8:26 am

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.
Mark
Mechanical Engineer

Post Reply