| Author | Message | ||
     Jonnyrotton |
I was recently told be a friend that the xb9r is a better motor for racing than the xb12r because it can take the high revs for a longer period of time. That the 12r is a better street motor than the 9. Is there any truth to this statement? | ||
| Aptbldr |
"... 12r is a better street motor than the 9. Is there any truth to this statement?" Well, bein's I choose a 12, I see truth's light shining brightly in your recap. : ) | ||
| Jraice |
Hm I dont know. The XB9R is easier to hot rod I believe but many buell race bikes are 1300+cc. More displacement will go faster, you can mod the XB12 to spin up more and even then... I havent done spirited riding on a 9 but everyone says compared to the 12 it rev's more and the 12 just has stout torque. That was not my impression of my 12. Its got the torque but if you really want to move you need to be upwards of 4-4.5K RPM. Its happiest way up in the rev's. It only has a 500rpm difference which I believe would be WELL made up for with its additional low end torque and overall greater horse power. Again though, the 9 is cheaper and easier to hot rod but in the end with equal performance upgrades the 12 will always be faster. | ||
| P_squared |
I was recently told be a friend that the xb9r is a better motor for racing than the xb12r because it can take the high revs for a longer period of time. The stock 9 does have a higher rev limit than the stock 12. However, both motors have been used in racing. The 9 in LW Twins, and the 12 in HW Twins. Both can be modified for racing depending upon your budget & desires. That the 12r is a better street motor than the 9. Depends on who you ask. The 12 has more low end torque. The 9 revs higher & faster. Different strokes for different folks. Is there any truth to this statement? Read the above & form your own opinion based upon how you ride & what you plan to do with the motor. | ||
| Skinstains |
Almost all the race bikes are twelves. | ||
| Rocketsprink |
12 can be used in LW for CCS. I had a 9 race bike. I prefer the 12 race bike I have now. Just my opinion though. | ||
| Hurricaneleah |
depends i guess...a 9 has shorter stroke so your piston speeds are lower, allowing you to safely rev higher. My .02, these are still long stroke pushrod motors,so the lower you rev them the easier it is on the valvetrain, less friction, etc, etc, etc. Of course if you throw enough money atsomething you can always make it work. To put some bounds around it,lets say 100 rwhp, it is much easier to get there with a XB12 without relying on lots of revs. You get to a point pretty quickly however, where you either make hp with displacement or revs (or both), and reliability suffers. All that said, the XBRR shares the XB9 stroke and that is the most highly developed pushrod air cooled engine ever devised...so pick your poison. | ||
| Woody1 |
Run what ya brung. more hp doesn't win the race, more torque doesn't win the race, more rpms doesn't win the race, displacement doesn't win the race, the one who does the most with the potential available to them wins | ||
| Dingosm8 |
pretty sure I read a review comparing the sx to the s on the track .. in stock form.. said they went around the track about the same. |
