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Buell Forum » XBoard » Buell XBoard Archives » Now here's one: xb9 heads on xb12 « Previous Next »

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Vonsliek
Posted on Sunday, June 11, 2006 - 01:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
any thoughts for race performance?!

seems i recall reading abt smaller heads on bigger bottoms for increased high end flow on racetrack?!

tyically under carbing a high revving, oversquare engine yields btr performance ..

so, for efi hotrodded xl motors .. wldn't reducing a wee bit heads make for a better response for track racing?

pauly.
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M1combat
Posted on Sunday, June 11, 2006 - 02:20 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
Aren't the heads the same?
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Cyclonecharlie
Posted on Sunday, June 11, 2006 - 10:49 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
I didn't think we had a high rev. motor? Our redline is most bikes "mid-range".
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Josh_cox
Posted on Sunday, June 11, 2006 - 10:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
The part numbers are exactly the same. So, you will see no difference.
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Indy_bueller
Posted on Sunday, June 11, 2006 - 11:46 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
It's the pistons that are different.
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M1combat
Posted on Sunday, June 11, 2006 - 11:46 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
And the stroke...
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Wademan
Posted on Sunday, June 11, 2006 - 11:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
The 9 has a shorter stroke allowing it to rev higher. The head will not affect anything.
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Deuceman
Posted on Tuesday, June 13, 2006 - 11:22 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only)
If I am not mistaken, only the stroke is different between the two engines. I think the 9 is just a destroked 12. Somebody correct if I am wrong.
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