| Author |
Message |
    
Rotor
| | Posted on Sunday, June 07, 2009 - 05:55 am: | 
|
i'm not yet decided about upgrading my XB9SX:
1250 cmc long stroke
or
1170 short stroke
???
I think the best is 1170 but i'm a little bit stressed about the maps, the only way i found for create new maps is starting from XB12 stock maps then dataloging.
what do you think about this ? has anyone yet created 1170 cmc custom maps with ecmspy ?
Francisco
(Message edited by RoToR on June 07, 2009) |
Bombardier
| | Posted on Sunday, September 20, 2009 - 08:34 pm: |
|
One throttle body feeding two cylinders with very close intake cycles.
This is not really a design you would expect to survive under continuous high revolutions with extremely accurate fuelling.
The a/f ratio to get you to the revs/power you want would always have to be erred to the side of safety over output due to the intake restrictions/design.
This was one of the major considerations when the XBRR engine was developed and the reason a twin TB setup was used.
This motor in its current configuration is best set at realistic revs for stroke lengths with higher torque being the goal rather than hp.
My 2 cents. |
Blake
| | Posted on Monday, September 21, 2009 - 05:59 am: |
|
The 1170cc short stroke is a case-bored job for XB9 stroke, so the equivalent long/XB12 stroke displacement would be 1440cc
The 1250 long stroke would just require a bolt on set of Revolution Performance nicasil cylinders, no case boring. 
>>>One throttle body feeding two cylinders with very close intake cycles.
The XBRR could rev to 9 grand. I don't think he's imagining that, just the same old 7,500 rpm.
Intake strokes are almost a full revolution apart, 315o.
I've seen a number of single carb Buells make really impressive power and last, around 120 RWHP for a built 1250cc is not impossible. The 1170 cc short stroker ought to get to 110 RWHP with just some good old fashioned engine tuning. |
Rotor
| | Posted on Saturday, September 26, 2009 - 09:38 am: |
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1170 kit from revperf ordered yet two months.waiting for it.stay tuned  |
Buelldad
| | Posted on Wednesday, July 27, 2011 - 03:26 pm: |
|
iv been readin this about xb9 - xb12 change over --i measured xb9 & 12 pistons pin to deck & can find no difference at all except the xbr has a dome & the others dont --how does it make so much compression i put an xb9r --pistons cyls & heads on a siw with no problems i also measured the tstorm piston pin to edge of deck & found no difference ,the xb cylinders were .016 taller than the si cylinders --i put a .035 coma head gasket no base gasket & came up with .046 head to piston .001 more thwn the si had to start with --so whats the big deal |
Blake
| | Posted on Thursday, July 28, 2011 - 08:21 am: |
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All stock/OEM XB9 pistons are domed. If yours aren't, then they are not XB9 pistons. |
Blake
| | Posted on Thursday, July 28, 2011 - 08:23 am: |
|
Model year to model year, the XB9R and XB9S engines are identical |
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