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Isham
Posted on Wednesday, June 21, 2006 - 04:01 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

I'd like to know the diameter of both outlets and the part where they come together.
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Duff24
Posted on Wednesday, June 21, 2006 - 07:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

the outlets are the same after the two come together...not sure about the inlets coming from the manifolds, I'm guessing about 1/4" bigger than the 9.
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Glitch
Posted on Wednesday, June 21, 2006 - 09:39 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

The exit from the heads are the same size, the collector exit is the same size as well.
Meaning you can use either XB header on either XB engine, and use either XB muffler on either XB header.
Is that what you were needing to know?
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Rr_eater
Posted on Wednesday, June 21, 2006 - 11:30 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Glitch, the pipe is a larger diameter on the 12. While the port is the same size, this difference does change scavenging characteristics and flow volume, exhaust velocity, etc. .

Just my .02

Bruce
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Glitch
Posted on Thursday, June 22, 2006 - 09:13 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Risking sounding like a smart ass, but not trying to be.
We all know the tubes are larger on the 12, but that wasn't the question.
Isham has a 984 engine punched to 1200, my guess is that he still runs a 9 header, and wanted to know if a 12 header would fit.
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Isham
Posted on Thursday, June 22, 2006 - 09:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Well im convinced I have 12 headers I just wanted to know the size of both header pipes. Need a sure way to check, plus it would be nice to know the diameter of both headers since I heard they were different.

Sorry my question was unclear.
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Dragonbuell12r
Posted on Thursday, June 22, 2006 - 10:06 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

12 pipes = 1.75

9 pipes = 1.50
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Isham
Posted on Thursday, June 22, 2006 - 10:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Good to know thanks.
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Duff24
Posted on Friday, June 23, 2006 - 01:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Didn't think installing 12 headers would make any difference in power cause the outlet is still the same size as the 9, making it just as restrictive.

Compare it to a funnel...same principal.
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Diablobrian
Posted on Friday, June 23, 2006 - 01:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

actually it will affect the scavenging of the cylinder because of sound wave and pressure wave
dynamics. These pipes are very carefully designed. It would have been cheaper for them to make
only one diameter of pipe. They changed it to make it more efficient with the different motor
characteristics. They did a very good job.
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Pwnzor
Posted on Friday, June 23, 2006 - 03:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

Why, then, are the headers different lengths?
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Diablobrian
Posted on Friday, June 23, 2006 - 08:12 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)

3 reasons.
1) packaging
2) uneven engine pulses
3) trade-offs to balance out the above 2
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