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Buell Forum » 1125R Superbike Board » Archives 001 » Archive through July 08, 2010 » Looking for 1125 header data « Previous Next »

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Xband
Posted on Sunday, July 04, 2010 - 04:25 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm struggling to digest the theory (theories) as to what makes good primary header / collector design. I think a little data about what others have done in practice would be great about now. Has anyone found data (length, diameter, maybe taper) on an aftermarket or the stock system?
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Slaughter
Posted on Sunday, July 04, 2010 - 05:03 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Go to Burns and check out their pipe design checklist. MUCH more than you'd think in designing a pipe.

Worth a look-see:

http://www.burnsstainless.com/RESF.pdf

If you fill in the form, Burns can cut and package the whole kit and ship to you for welding.
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Bob_thompson
Posted on Sunday, July 04, 2010 - 06:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I do not think you could beat, very easily, the Buell race pipe design and they have used a 2 1/4" or 2 1/2" collector to a free flowing muffler. I used a 2 1/4" in my own design and a fiberglass straight through muffler and am well pleased with the results along with an Erik Buell Racing race ECM. Bob
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1_mike
Posted on Sunday, July 04, 2010 - 07:08 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Header design is all over the net...just need to look..!

There...IS NO perfect header that fits all circumstances.

You build a header for -
1. what the intended engine use is.
2. for what the engine combination is.
3. for what the RPM range will be.

If it were a car...you'd add manual or automatic transmission.

This is the short list. Take the three items above...and expand each of them to its fullest.

Headers...just like intakes...(and many other things) are a compromise for the intended final use. The street..being one of the most compromising of them all.

Mike
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Slaughter
Posted on Sunday, July 04, 2010 - 08:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

From Burns Stainless Exhaust design checklist:

Vehicle and type of racing
Engine manufacturer
Useable RPM range
Maximum RPM
Peak horsepower
Peak torque
Displacement
Bore
Stroke
Compression ratio
Racing class or category
Configuration / # cylinders
Kind of gain you want
If you are able to send a copy of a current dyno sheet, flow data, or information abstract, please do so.
Additional comments:
Cylinder head manufacturer
# of camshafts & location
Valves / cylinder
Intake valve head diameter
Exhaust valve head dia.
Cam manufacturer & model #
Intake lift at valve
Int. duration @ .050 lift degrees
* * if duration @ .050 is unknown, specify lift at which it is measured
Intake opens @ degrees BTDC
Exhaust lift at valve
Exh. duration @ .050 lift degrees
* * if duration @ .050 is unknown, specify lift at which it is measured
Exhaust opens @ degrees BBDC
Primary length
Secondary length
Collector outlet diameter
Collector type
Cylinder head model
Type of fuel system
Carburetor or throttle size
Intake port dimensions
Exhaust port dimensions
Lifter type (roller, flat, hyd.)
Intake rocker arm ratio
Intake lobe centerline
Intake closes @ degrees ABDC
Exhaust rocker arm ratio
Exhaust lobe centerline
Checklist from Burns Stainless:

Exhaust closes @ degrees ATDC
Primary OD (or step diameters)
Step lengths
Secondary OD
Step lengths
Tailpipe diameter

Header Configuration ( 4-1, tri-y, etc )
32
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D_adams
Posted on Sunday, July 04, 2010 - 08:19 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)


quote:

Primary OD (or step diameters)
Step lengths
Secondary OD
Step lengths
Tailpipe diameter




That was part of the formula I used a while back.

Realistically, getting much over 140-145 hp on a dynojet with the stock headers will in all likelyhood be very, very difficult to do. Stepping the headers will help some, but keeping the exhaust tucked under the bike makes it tougher to accomplish.
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Xband
Posted on Sunday, July 04, 2010 - 10:26 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Holy crap! And I haven't even gotten to the calculus yet.
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