| Author | Message | ||
     Firebolt020283 |
i was messing around on the web and came across racingmotorcycles.com and they had this racing crankshaft  Racing Crankshaft for the XB9(3.125) Stroke or the XB12(3.812) Stroke is 3 pounds lighter then stock so my question is there any advantage to this crankshaft other than it being 3 pounds lighter?? | ||
| Glitch |
The RPMs will spin up faster. | ||
| Firebolt020283 |
well is it worth spending $930 on? | ||
| Trenchtractor |
it does look very trick, but I'm assuming you mean $930USD?? If so, well out of my price range fow a little more response... If you were building the ultimate race motor... But then cost wouldn't matter. | ||
| Glitch |
well is it worth spending $930 on? Not for me, but maybe for you. This is something (IMHO) that probably wouldn't do the street rider a lot of good. Besides Aaron (NRHS) has some very fast bikes that he's never split the cases on. If it were me and I was thinking of engine work (I am, but probably not 'til winter) I'd be looking here and giving Aaron a call. If you haven't met Aaron (I've only "met" on this board), you'll be glad you did when you do. He'll give you straight answers, even if it means him not making as much money. He's a stand up guy with A LOT of knowledge, and an excellent shop. Just tell him what kind of riding you do and how you want the bike to perform, he will not steer you wrong. | ||
| Firebolt020283 |
well maybe not the ultimate, but i am planning on building a relitivly good motor; and so far i knida know what i want to do but im trying to find if there is that just little further i can take it just to make my plans that much better. hell i got untill march 2005 to think about what im going to do to it then ill get to go home and start doing it, and i have about $10,000 sitting in the bank and i always swore i was gong to build me an awsome bike and this is my probly one and only chance to do it so that what im gonna do. in the same sence i dont wanna waste money ether, if im going to buy somethig for the bike its going to serve one of 2 purposes ether to make the bike run better or look better | ||
| Steveshakeshaft |
Where from please? Steve steve_s@ukbeg.com www.ukbeg.com | ||
| Hogs |
Shaving the wheels to make em lighter is NOT a good ideal for the street and I`m sorry can`t answer you why but do alot of research BEfore you go there.... | ||
| Firebolt020283 |
well i was planning on useing them for the head work and boreing my cylinders already i was just curious if there was advantiges to changing to those crankshafts | ||
| Hogs |
I forget what its all about regarding the revs not coming back fast enough?< Losing return etc. great for racing wide open throtle all the time perhaps... but for street its A NO NO for what I have been told over the years ..But Check it out for yourself | ||
| Glitch |
I wouldn't split the cases unless I had to, but, that's just me. With 10 Grand in the bank though, it's hard to say when I'd stop! | ||
| Firebolt020283 |
i do see ur point and i dont htink i want to slpit them open any way unless it would give me a substantial improvement cuz that would probly cost a small fortune to buy the crank and split the cases | ||
| Trojan |
One of the biggest advantages with the raced crankshaft (apart from the 3lbs weight reduction) is that it is properly balanced. Something that you can't be sure about otherwise  Steve, if you want one we can get 'em  | ||
| Kaudette |
Hmmm... Start with a 12 - bore the cases for a 1450 job, upgrade with a lighter crank, ti valves, better connecting rods, Stage 3 heads, and free flowing exhaust, put the 9 gearing on the 12, work a way to fix the timing and use a custom ECM with a 7500 rpm redline and away you go!!! I bet you could get upwards of 130 horses from that setup.?. Any chance of getting this at under 100 db for the sound police???  | ||
| Firebolt020283 |
my qusetion is, since i got to break my engine down any way to get the cases bored should i get the race crank? i mean hell ill have the thing broken down any way. i just wanna build this engine right but i dont want it too high strung cuz its still going to be mostly a street bike | ||
| M1combat |
Damn high strung... Build a race bike and put lights on it  . | ||
| Bud |
283, if your thinking 1425 cc, get the racing crank with the 12 stroke ( you will need a other one after all for 1425 ) and get that thing balanced with the pistons weight in mind !! if your “only” big bore to 1200 use the old crank and get that thing balanced with the big pistons me thinks that the drivability with the race crank is a bit more lumpy and bucking gtz,b | ||
| Kbbeckius |
I suggest you read some of the technical articles here http://www.visi.com/~moperfserv/report.htm scroll down for the Buell-HD section. There are some write ups on some engines built up against the traditional HD wisdom. I believe there are many different paths to building power, if nobody ever went against the grain, we'd still be riding flatheads! The deal is, some paths are less costly and are well proven means to power. The less power wasted accelerating rotating mass, the more power available to accelerate the bike, i.e. the engine will "rev quicker" (For two-strokes there are companies who cut weight off the flywheels, but there are also companies who offer weights to attach to the flywheels! Dependent on the bikes intended usage.). Many engines with an inherent imbalance (like a 45 degree V-twin, many V6s, etc.) use heavy flywheels/crankshafts or balance shafts to smooth out vibrations. There is a way to counter the effect of reducing crank/flywheel weight, reducing the weight of the piston/rod combination. Heavy rotating mass "stores" energy, this is one of the reasons Buells lurch forward so bad after a clutchless shift. When you change gears one of two things must happen, the engine must decrease rpm to match the speed of the rear tire in the new gear, or the speed of the rear tire must increase to match the engine's rpm in the new gear. Some drag race cars have weighted flywheels (more rotating mass) to store energy for a quicker launch off the starting line. The more rotating mass there is, the more resistant it is to changing velocity. A certain amount of rotating mass is necessary for an engine to run, especially in engines of few cylinders. A four stroke only has a cylinder fire every other revolution, and some rotational momentum is necessary to keep it running and running in the right direction (I once had a two stroke ATV which had a faulty ignition box, one time it backfired and ran backwards! I had six speeds of reverse! ) Really it's a trade off, give and take, stored energy vs. available energy. Generally in the racing community the goal is to have the lightest, strongest parts available, but remember they're also rebuilt and inspected far more often than a street vehicle. Good Luck Brad | ||
| Firebolt020283 |
wow thanks every one for the info suggestions though i have just began to ask all my different questions about this engine see my biggest problem is all i know about is the older evos (with carburators) and like with the crank i didnt know much about that cuz never changed one before so im just trying to find out what i can about my bike and engine before i go tearing it apart (so i dont make it run like crap). i mean i know how to work on a bike (though i dont begin to know much about tuning the ecm) but again thanks everyone | ||
| Opto |
Getting the crank balanced properly is expensive but results in a real sweet-running motor, worth every cent IMO...check with the gurus 1st, this may or may not be very applicable to Buells. | ||
| Court |
I like the "heavy" crank of the S-2. I have had Truett and Osborne balance mine. Court | ||
| Slowby |
the new one is six lbs lighter and i got one. just broke away from the dealer to start my own shop w/ a buddy, so it will look pretty like the picture for now. also got the injectors, race molule, map to go with, springs, f spkt, 1200 bigboar, pipe ect... will be sweet this next racing season. | ||
| Blake |
Toby, Sounds sweet. Yer gonna be whuppin' up on them SV's fer sure. Any chance it'll be ready for OHR at the end of September? You can doooo eeeeet. ![: ]](http://www.badweatherbikers.com/buell/clipart/proud.gif) |
