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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Big Mechanicals: Head, Cyl, Piston, Rod, Crank, Flywheel, Cases, Bearings » Xb pistons « Previous Next »

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Buelldad
Posted on Saturday, January 16, 2010 - 02:17 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

whats the difference in the xb 9 & the xb 12 piston -what ive measured there the same bore & ihe pin to piston deck & pin dia are the same --but catalogs show them as different ??
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Knickers
Posted on Sunday, January 17, 2010 - 07:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

The 9 piston is domed to give a smaller combustion chamber. That keeps the compression ratio the same as the 12 with the shorter stroke 9 crank. If you put 9 pistons into a 12 motor you get a higher compression ratio. Somewhere in the 12:1 range.
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Buelldad
Posted on Wednesday, July 27, 2011 - 03:31 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

what im seein only the xb9r is domed i have some xb9 not r pistons & they are flat
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Blake
Posted on Thursday, July 28, 2011 - 07:56 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Then they are not stock/OEM XB9 pistons.
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Blake
Posted on Thursday, July 28, 2011 - 08:00 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

There is absolutely no difference between engines for XB9 "R" and "S" model bikes.
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