| Author |
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Wutend007
| | Posted on Wednesday, November 02, 2011 - 09:19 pm: | 
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I was just looking at other charts and checked SPY in the 12 and the rev limiter is set higher so now im thinkin it was the limiter cutting it out. |
Greg_e
| | Posted on Wednesday, November 02, 2011 - 09:38 pm: |
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I have some used 9 pistons if you are interested. Not sure if they can even be used since I haven't measured everything. I can say it looks like they were scuffing on the cylinders a little.
FYI I would suggest two different anodize on these pistons.
#1 is a cold hard anodize on the crowns.
#2 is a style that leaves fairly large "pits" which can be filled with a very thin layer of oil. Basically a non-sealed anodize.
I would also make sure the inner side of the piston has no anodize so that the thermal transfer to the oil spray is maximum.
What I don't know is how well this alloy takes the anodize so it could be a crap shoot. This might be one of those DIY tests that someone needs to do, maybe one of the people that have an anodize shop will be interested in testing. |
Gunut75
| | Posted on Thursday, November 03, 2011 - 08:11 am: |
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In the old multi-cylinder 2 smokes, we would ceramic coat from the lower ring land up, and teflon coat the outside of the skirt. That worked in a V8 up to 12,000 rpm or so. Around 400 hp. |
Bike_pilot
| | Posted on Friday, November 04, 2011 - 07:38 pm: |
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I would think that the XBs in particular would benefit from ceramic coating the top of the piston as well as the combustion chamber and ports. Might reduce heat a fair bit as it would reduce the amount of heat absorbed by the heads. The ceramic on the piston should help with detonation.
I'm not real sure how anodizing alters thermal transfer. I know that when International added a turbo to their old IDI 7.3L diesel they also fitted it with anodized pistons - I assume because the turbo model runs higher EGTs (~1200 deg F at the exhaust header). |
Greg_e
| | Posted on Saturday, November 05, 2011 - 11:42 am: |
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Anodizing offers some small amount of thermal insulation but not like ceramic coating. I was thinking more from a durability and lubrication point of view. It could also be argued that a cold hard anodize on the entire thing would make it more slippery until the anodize was worn away.
The stock pistons have some kind of coating below the rings for this purpose, probably a teflon like plastic. |
Tacpbuell
| | Posted on Tuesday, November 08, 2011 - 06:55 pm: |
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Do you know if its possible to go the opposite route on this? Having 12 pistons in a 9? If so what would be the results? Also would putting a 12 throttle body on a 9 be a plus?
-Scid |
Deanh8
| | Posted on Tuesday, November 08, 2011 - 07:45 pm: |
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12 throttle body on a 9 would help the 9 throttle body is tiny.
If I had an XB9 again and wanted more power I would do the XB12 header pipe, XB12 throttle body, and thinner headgasket. You would have a reliable stock-like bike, with the extra power.
12 pistons in a 9 would drop the compression to much, make less power but maybe be more reliable?
I put a ported XB12 throttle body on my Xb9 and it made a world of difference. |
Deanh8
| | Posted on Tuesday, November 08, 2011 - 07:46 pm: |
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It made peak power at 6200 vs 6500, thats why the dyno guy let off, it wasnt making any more. |
Tacpbuell
| | Posted on Tuesday, November 08, 2011 - 08:25 pm: |
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And the 12 header and throttle body are a direct bolt up to the 9? |
Greg_e
| | Posted on Tuesday, November 08, 2011 - 10:40 pm: |
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Yup, they seem to bolt right up. Going to require tuning because the injectors are different and flow a little more fuel than the 9 injectors. Make sure to get the velocity stack that goes with the 12 TB, they are not the same between both version. Everything else should swap directly. |
Tacpbuell
| | Posted on Tuesday, November 08, 2011 - 11:23 pm: |
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Thanks Greg should be a fun little addition. |
Ericz
| | Posted on Wednesday, November 09, 2011 - 07:22 am: |
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The fuel injectors are the same between a XB12 and XB9. The only difference is the ECM tune. |
Whitetrashxb
| | Posted on Wednesday, November 09, 2011 - 09:45 am: |
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i really could be wrong, but i was thinking the injectors were not the same between the 9 and 12, at least the earlier years... |
Ericz
| | Posted on Wednesday, November 09, 2011 - 12:03 pm: |
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The only different injectors were in the 2003 XB9, but that was because the intake manifold and fuel rail were different too. All 2004-2010 OEM XB injectors are identical. |
Whitetrashxb
| | Posted on Wednesday, November 09, 2011 - 03:08 pm: |
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that explains my thinking then... thanks |
Tacpbuell
| | Posted on Wednesday, November 09, 2011 - 06:48 pm: |
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So considering I have a 2003 xb9r what would I need to do? |
Greg_e
| | Posted on Wednesday, November 09, 2011 - 08:40 pm: |
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OK, then I'll clarify, my 2003 XB9 injectors are not the same as the XB12 injectors.
If you have an 03 9R and you want to put in an XB12 throttle body, you will need the injectors for the xb12 TB. If it doesn't come with injectors then you can buy some that as similar to stock up to much higher flow than stock. |
Deanh8
| | Posted on Wednesday, November 09, 2011 - 10:40 pm: |
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XB9 on the right
It will bolt right up, so will the header and velocity stack. Should wake the bike up a good amount.
 |
Whitetrashxb
| | Posted on Thursday, November 10, 2011 - 01:08 am: |
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looks like that would compliment my about-to-be-installed 1050 kit nicely
 |
Slaughter
| | Posted on Thursday, November 10, 2011 - 09:22 am: |
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Not sure if the oxy sensor can adjust for the higher flow without re-mapping. Don't run it until you've done a few dyno pulls or a few runs collecting data. |
Whitetrashxb
| | Posted on Thursday, November 10, 2011 - 10:42 am: |
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good point, the O2 sensor isn't something i considered... but i do know once it all comes together ECM spy will definitely be used for tuning.. |
Firemanjim
| | Posted on Friday, November 11, 2011 - 02:34 am: |
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Dyno guy did not let off,ran it to the limiter,but maybe did not have dyno synched with bike exactly-- (ask me how I know) |
Deanh8
| | Posted on Friday, November 11, 2011 - 11:09 am: |
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Thanks again Jim runs great! |
Tacpbuell
| | Posted on Wednesday, November 16, 2011 - 01:10 am: |
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Couple more questions:
What size is the 12r TB compared to the 9r TB?
Also should I get a 12r oxygen sensor or just stick with the 9r one?
-Scid |
Terrys1980
| | Posted on Wednesday, November 16, 2011 - 09:04 am: |
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12 is 49mm and 9 is 45mm.
The oxygen sensors are the same, the settings in the ECM may need to be tweaked. |
Daywalker
| | Posted on Tuesday, December 20, 2011 - 04:49 pm: |
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http://www.badweatherbikers.com/cgibin/discus/show .cgi?tpc=32777&post=2141500#POST2141500
Do you have pictures before the machining as well and what did you do/how much did you remove? Did you have a compression ration you want ed to get to? |
Bike_pilot
| | Posted on Wednesday, December 21, 2011 - 08:39 am: |
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You'll have a lot more air for a given % throttle opening, I think a re-map would definitely be needed for it to work well with the larger TB. Always amazes me how tiny buell TBs are--for reference my wife's Monster 620 (also a 2-valve, air cooled twin) wears two 45mm TBs). |
Skinstains
| | Posted on Tuesday, December 27, 2011 - 09:10 pm: |
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Smaller diameters = higher speeds |
Skinstains
| | Posted on Tuesday, December 27, 2011 - 09:11 pm: |
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and less volume |
Jas11388
| | Posted on Friday, December 30, 2011 - 08:00 am: |
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so let me get this straight, i should put on a TB stack, injectors, header pipe, along with a 1050 kit and cams on my 03 XB9R, any other suggestions for performance on the bike? |
Blake
| | Posted on Friday, December 30, 2011 - 11:15 pm: |
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Don't need cams. Same cams are good for 110+ RWHP on an XB12, so ought to handle what you are planning just fine. They are darn good cams. |
Bike_pilot
| | Posted on Sunday, January 15, 2012 - 07:29 pm: |
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I'd look long and hard for a micron exhaust system if I had a 9. Also plan on a lot of dyno time and make sure you have a good dyno guy. With the big bore and big TBs no off the shelf map is going to even be all that close. |
