Katana of the Month October 2008
 

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Katana How-To's & FAQ's A forum filled with write-ups, FAQ's, and visual aids for
mechanical & cosmetic modifications to your Katana.

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Old 07-20-2005, 11:43 AM   #1
Black_peter
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Default Exhaust Exchange list (draft)

Pre 98 600:

Yoshi header (nitros222)
Notes:
Mod needed to belly pan.

98+ Yoshi 750
Notes:
Same as above

98+ Stock 600 exhaust
Notes:
Mod required to clear oil pan. (dent collector or use 98+ pan)

98+ Stock 750 exhaust (waltri/ Cyber poet)
Notes:
Mod required to clear oil pan. (dent collector or use 98+ pan)

Pre 98 750:

98+ exhaust (a few incuding CP)
Notes:
Same as for 600 install above

98+ 600:

Bandit 600 header (beekman)
Notes:
Center stand needs removing.
Trim belly pan

98+ 750:
Bandit 1200
(results to follow.. inprogress)

1100:
86-89 ZX-7 Muzzy full System.
Notes:
Outside pipes require a little spreading (3/8")
Can matches stock mounts.

Pre 92 GSXR header

Formula: (Cyber Poet)
For the mathamaticly bold:
Example (values not absolute, just plucked out of the air):
Stock 98+ Kat 600 header: 23mm diameter
Stock 98+ Kat 750 header: 26mm diameter.

Area = Pi (radius^2)
Radius = 1/2 diameter
Thus
Area = Pi ((.5 (diameter))^2)

For the 600, the formula would go like this:
Area (square mm) = 3.14 * (1/2 * 23)^2
Area = 3.14 * (11.5)^2
Area = 3.14 * 123.25
Area = 415 square millimeters

For the 750 exhaust by comparison:
Area (square mm) = 3.14 * (1/2 * 26)^2
Area = 3.14 * (13)^2
Area = 3.14 * 169
Area = 530.6 square millimeters

One more formula to compare the two cross-sections (and therefore the flow rates):
((new/old)-1) * 100 = percent change
((530/415) -1) * 100 = % change
((1.277)-1) * 100 = % change
.277 * 100 = % change
27.7% change

(For those of you who want to jump my case about subtracting one and multiplying by 100 as incorrect math -- I simplified the whole percentage thing down [KISS] for those poor at math).

Thus, the 750 header flows 27.7% more than the 600 header. That's a substancial difference, enough to warrant serious jetting changes under most circumstances. A jump to an 1100 exhaust may induce an even bigger change, one that will take a lot of experimentation to come up with the right jetting for...

On the other hand, simply grinding out the welding seam lip on the same 600 header will net you a couple more mm of clearance on the exhaust, giving you about a 15 - 20% flow change for the cost of a couple dremel grinding accessories (provided you already have the dremel or equivilent).

ONE BIG NOTE:
Back pressure at low RPM's causes the engine to produce substancially more torque; this same back pressure at higher RPM's works against the engine's ability to flow large quantities of exhaust. Thus, it's a trade-off, and depends on where you want to make the power. For a more detailed discussion of back-pressure and how it affects torque/hp/power, see this thread: http://www.katriders.com/forums/viewtopic.php?t=2400

Last edited by Black_peter; 03-30-2009 at 04:14 PM..
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Old 10-20-2005, 12:19 PM   #2
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Wow , has this never been stickied ?
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Old 10-20-2005, 12:22 PM   #3
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NOPE!
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Old 10-20-2005, 01:01 PM   #4
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I guess I don't rate...
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Old 10-20-2005, 01:03 PM   #5
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I'LL sticky it !
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Old 10-20-2005, 05:42 PM   #6
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Quote:
Originally Posted by md86
I'LL sticky it !
oh really???

It's now stickified.
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Old 10-20-2005, 06:50 PM   #7
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What's the point?? Hey I had a Yoshi installed on my pre98...no mod needed...let the pipe naturally melt the belly pan...now it clears....
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Old 10-20-2005, 08:48 PM   #8
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Yoshi makes a header for 98+ 750s? Do you have to special order one?
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Old 10-20-2005, 09:57 PM   #9
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Quote:
Originally Posted by Phoenix_Rising
Yoshi makes a header for 98+ 750s? Do you have to special order one?
They did. Then they discontinued them in early '03 IIRC.

/kiba
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Old 10-21-2005, 12:44 AM   #10
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Quote:
Originally Posted by WildKat
Quote:
Originally Posted by md86
I'LL sticky it !
oh really???

It's now stickified.
See , it worked !
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