| Author | Message | ||
     Texastechx1 |
Like the title says... is it possible? I tried searching, came up with nothing. I'm thinking, in the future, of an XB9 crank (3 1/8") with a 3 13/16" bore motor with stage 3 NHRS heads and some big cams for an 100+hp, 7000+rpm BADASS! Nick | ||
| Texastechx1 |
And BTW... does ANYONE know where I can get some detailed head flow numbers for NHRS CNC heads? Nick | ||
| Natexlh1000 |
I think the XB engines are too different for this type of thing to be possible. Perhaps it would be more easy to see if S&S sells destroked flywheels? If you do convert your bike to spin up that high on a regular pasis, you would have to also make sure the valves could close as fast as those "beehive" springs in an XB engine. I think even with the stock stroke, the valves start to float near the 7000 RPM side. Don't take this as a negative though. I have been thinking of something like this since the XB9r came out in 2002! Those things run smoothe! | ||
| 46champ |
You might call Truett and Osborne The web site lists down to 3 1/2 and the say call for other Custom stroke. How does one post a link? | ||
| Phelan |
Nick, good luck with the project. I am in the same boat with a different final destination; I'll be using a heavily modified EFI sporty crank for my DELPHI build. You might research a little bit as well about DDFI III. If it uses a CKP, I would start with an '08-up XB9 crank so you have one less hurdle to jump when you decide to convert to Delphi EFI. | ||
| Texastechx1 |
Looked at S&S, seems like it would be a custom app. http://www.truettandosborn.com/flywheels.htm Might go with them if they can make it as light or lighter than a stock buell. flywheel | ||
| Texastechx1 |
http://www2.ahdra.com/ubbthreads/ubbthreads-5-5-1/ ubbthreads/showflat.php?Number=36983&page=15 Guy here says XB cranks will fit in sportster cases.  | ||
| Alex |
We started running an XB9 crank in our tube frame race bike some years ago. So yes, it can be done. Regards Alex M-TeK Engineering | ||
| Phelan |
Awesome! So Alex, what did it take to fit it? | ||
| Natexlh1000 |
Thats really cool! I just assumed that the crankcase was too different. I always thought an XB9-based tuber would be great. | ||
| Buellistic |
It makes for a much smoother running engine ... Wonder why they stopped making the XB9 engine ??? | ||
| Guell |
they didnt, its still in the city cross | ||
| Buellistic |
Matt: You are right again ... When "i" did not see the XB9R in the line up, "i" thought the XB9 had went by the way side ... When "i" look at the BUELL Line all "i" can see is any Model designation with "R" In BUELLing LaFayette | ||
| Guell |
No worries LaFayette, I thought they stopped making it too when they blacked out the frame. When are you going to make it up this way again? | ||
| Alex |
You need to modify the sprocket shaft to accept the Timken bearings, based on the year of build of the crankcase You may have to modify the pinion race area (which is also necessary if You want to install a late style X1/M2 crank in in a case before 99 I guess) and You need to modify the engine sprocket to stop it from blocking on the shaft before reaching the spacer/Timken bearing setup as the sprocket splines of the XB shaft are a little shorter. Having a good lathe and beeing able to disassemble and reassemble a pressed crank shaft is a good thing to have for that process. Regards Alex M-Tek Engineering | ||
| Phelan |
Alex, I'm putting you on my mental "make friends with these people!" list. I plan on building a Delphi-powered S2T next year via an EFI sporty crank, which I hear is very similar to at the shaft to the XB cranks. | ||
| Buellsrule |
Use a S&S crank kit. Throw out the crank pin and use a Jim's 3 hole. Balance the whole assembly and you have a bullet proof bottom end that should last for years and thousands and thousands of miles. It will cost less than trying to source a XB bottom end. | ||
| Phelan |
Very true, but the S&S kits don't have teeth on the wheels to be read by the crank positioning sensor (CKP) on the Delphi sportys. | ||
| Buellsrule |
I thought this project was for a X1. Why the Delphi comment? | ||
| Phelan |
Sorry, I was talking about my project that I posted in here just a few posts up. I almost forgot about the original topic LOL. | ||
| Texastechx1 |
Phelan's projects are of Frankenstein origin. but we don't judge him for that  . | ||
| Phelan |
What can I say? I'm not a doctor, but a Madman LOL. | ||
| Jeffb |
S&S can't build cranks with strokes less than 3.5". Sorry. Jeff | ||
| Texastechx1 |
^^Now that sux!^^ | ||
| Phelan |
BTW Nick there is an XB9 crank in the classifieds cheap. | ||
| Slaughter |
Shoot a note to John Dahmer at Darkhorsecrankworks.com. They did my 08 flywheel/crank into my 03 XB - modified the cases and all works just nifty. He can walk you through all of your options. The XB short stroke may not work well. De-stroking your motor to give a little more RPM may be good but the XB crank might not be the answer. If it CAN be done to a Buell or HD, they can do it. http://www.darkhorsecrankworks.com He's done some really trick stuff as far as cranks for all sorts of bikes. He builds the cranks for Paul James/James Gang MotoST endurance bike and has done a TON of crank work for the tuber race bikes back in the day. (Message edited by slaughter on December 05, 2008) | ||
| Silas_clone |
XL / Buell Timken bearing conversion $349...? When did HD bottom ends STOP using timken bearings? ...and why? | ||
| Texastechx1 |
http://www.nrhsperformance.com/index.shtml When this build finally comes to life (many years down the road) I plan on going to these people for at least the head porting if not more. While looking through their catalog, I found that they offer a 3 5/8" stroke crank from S&S especially for tube frame Buells. 3.8125 bore x 3.625 stroke is still oversquare like I'm aiming for a more linear engine. It would be 82.77ci or 1356.3cc, which is plenty big. team that up with my stock Thunderstorm heads CNC'd out to stage 3 specs with SE536 or RedShift585 cams, Force big bore header/exhaust, bored throttle body all tuned up with ECM spy... I think I just pee'd a lil.  | ||
| Texastechx1 |
Dan Norlin's 1998 S1 lightning  NRHS Stage 3 STD heads NRHS/Axtell 82" kit NRHS Custom Exhaust System Red Shift Cams S&S Super D carburetor Crane HI-4E Ignition ...I think... yep... I just soiled my self.  | ||
| Texastechx1 |
I read Alex's post and I got to thinking... my crank (2002 X1) is a press on style right? is the XB9 crank the same? is it possible to swap flywheels and not the entire crank? if so, that would solve the fitment problem. (Message edited by TexasTechX1 on December 08, 2008) |
