| Author | Message | ||
     Yohinan |
For all the engine builders out there I have a question or two regarding the XB platform ( 12 ). When doing heavy ( internal ) upgrades what are the parts you start to see fail first? As far as I know when people upgrade to the big bores kits, etc.. they normally do not upgrade rods, crank, etc... What kind of power numbers do the stock rods and crank hold up to? Any idea what the stock rods and crank weigh in at? My plans for my upgrade have been put on hold due to a car accident but I am going to go even bigger than originally planned since I have to wait longer now. TIA for the help. | ||
| M1combat |
Convert to Temkin bearing. | ||
| Glitch |
what starts to go first Your wallet... | ||
| Hogs |
THen Your OLD LADY/ Girlfriend...And Not Necessary in that Order..! | ||
| Hobanbrothers |
Glitch and Combat are both right, there are a few others also. Everything depends on the enviroment it is put in. Are you racing at Daytona, are you street riding or salt flats? How long do you want them to last, there is a life span depending on the enviroment also. What is piston wgt and planned compression? How many RPMs do you spin too? 12 rods will hold up to more than the 9's will, but all of ours we will shotpeen and magnaflux in racing applications. I have just about all the weights a guy could imagine for flywheels, I would have to look in our books though as I do not know off the top of my head. | ||
| Jimidan |
Cute answers...you had better be wealthy or sponsored because it takes a lot of dough to build modern HP into these engines. I am not weathly, but my Mom left me some money so... I am not running racing motors per se, but I have put my 88's through many track days, and generally run the pee out of them. There seems to be a tendency for the thrust faces of the JE Pistons to erode over several thousand miles (under 10,000), thus scratching the cylinders in the process. I have had this issue on both engines. On this last go around, I sent my top end back to Axtell for Ron Dickey to prep in their machine shop, and I have been very satisfied with the results. He even measured and set the pressure of the rings on the cylinders! I have one motor that was built with the stock XL rods and one with S&S Heavy Duty rods. I have had no trouble with either of these rod assemblies, although the S&S rods are noticeably larger and heavier. The S&S rodded engine also has the S1W crank assembly with static balancing @ 3500 rpms (requiring heavy metal to compensate for those rods) with the JE's, and STD heads. The stock XL rodded engine has the stock XL crank assembly that was given the Balance Masters Dynamic Balancer treatment. This engine has stage 3 Thunderstorm heads. This is one smooth engine, even at idle. The Balance Masters will compensate for up to 16 lbs. of rods and pistons...and still maintain balance at ALL rpms. If I were building another one of these engines, it would definitely have the BM treatment. Smooth engines are more powerful engines. Both engines are a scream. Don't even think about the Balance Masters system if your flywheels look like the XBRR's...they have to be round. jimidee | ||
| Rocketman |
Actually, I disagree it takes deep pockets to tune, well at least an XL engine. There are cheap ways to accumulate the right parts, most of which turn up on Ebay if you're prepared to wait, or start searching well in advance of engine building. I found some absolute bargains through Ebay when I rebuilt my motor. I imagine this is one saving grace that these motors in one form or another have been around forever. Rocket | ||
| Blake |
Balance master? Please elaborate. I'm not familiar with that technology. | ||
| Paulinoz |
Balance Masters have introduced the first product available that utilizes active engine balancing technology designed exclusively for Harley Davidson engines. This state-of-the-art system eliminates dynamic balancing completely, replacing it with a system that is permanently mounted on the engine! Allow me to Google for you mate. | ||
| Blake |
Thanks mate. Sounds almost too good to be true. Got any pictures?  | ||
| Blake |
Their web site commentary seems to have some problems. I can see how a fluid would help dampen vibration, but I cannot see how it would provide any balancing. | ||
| Diablobrian |
Probably something similar to a fluidamper that they've been selling for hot rods for years. It works as a harmonic balancer there, so it would seem to suggest it would be at least plausible on a Buell. | ||
| M1combat |
Well... There are two sides to the fluidamper debate you know  . | ||
| Blake |
Like I said, damper - yes, balancer - no. | ||
| Cataract2 |
I think the big question is, are you building for the street or track? | ||
| Signguyxb12 |
I would like to have more HP put into my engine also...street and longevity......where do I start...??? | ||
| Yohinan |
Cataract I am looking for both. I am looking for a high hp engine that still has street manners but not the best of manners. Yes I know about all the negative side effects but I don't mind them. I want longevity and lots of power. I don't care what anyone says you can have both but there will be compromises. I have both longevity and power in the motor in my car and can have the same in my Buell. |
