| Author | Message | ||
     Ericz |
It is done! John at Darkhorse Crankworks built me a beautiful 2008 crankshaft with Carrillo rods, balanced for my components and installed an upgraded left side crank bearing. The crank pin is pro-plugged and welded so this crank is bullet proof. They also drilled the necessary timing mark on the flywheels so that I can properly setup the base cam and ignition timing with my DDFI-II engine management. Here are some pics:      | ||
| Slaughter |
SWEEEET! That build will probably outlive us all! | ||
| Whitetrashxb |
sooooo envious! very nice | ||
| Reepicheep |
Very nice, thanks for the pics. I hope I don't have to go there, but if I do, the beauty of that thing will make me feel better about it!  | ||
| Motorbike |
Wow, that thing is beautiful! Too nice to hide it inside the engine... | ||
| Natexlh1000 |
Wow. Shame it has to be covered up inside a crankcase to be used. | ||
| Froggy |
Awesome! May I ask how much it set you back? | ||
| Ericz |
It ran about $1700 total including the new crank bearings and lapping the right side bearing race and fitting the crank bearings. | ||
| Whitetrashxb |
so are the plans for this to go back into the turbo motor? that was you who had that fabulously build engine correct? James | ||
| Ericz |
Yup, into the turbo motor this will go. I plan to have things together around Feb. I am still researching transmission parts and as soon as I figure that all out, I will start assembly. | ||
| Whitetrashxb |
i think i mentioned to you before i have several spare trans parts/gears whatnot.. not sure what all i have exactly as its in storage, but if u need any parts i could take a look to see | ||
| Bike_pilot |
That is very nice! | ||
| Ericz |
I am going to buy a set of Andrews transmission gears and have R&D Motorsports prepare them. I will be using the stock 1st gear set with the standard ratios for 2nd-5th. With the 5spd Sporty transmission ratios, it will allow me to gear my final drive even taller to a 20T front and 43T rear and maintain a usable 1st gear for around town. It will put my top speed at 7500rpm around 167mph or so. Plenty fast for me and the gear ratios should work better with my power. | ||
| Hughlysses |
Very impressive. Definitely the XB crank and rods from hell! | ||
| Speedfreaks101 |
What's is upgraded about the left side crank bearing? Size, brand, material, etc.? Are the rods stock length? What drew you to Darkhorse over the other guys? Also what is upgraded about the granny gears? Sorry for all the questions. BTW it looks killer. | ||
| Pash |
Looks nice Eric. Why not go with the later ECM? More functions to play with and great for logging slave lambda sensors on the same time base. | ||
| Ericz |
The upgraded crank bearing is the Screamin Eagle Lefty bearing http://www.amazon.com/Harley-Davidson-Screamin-Eag le%C2%AE-Lefty-Bearing/dp/B003WTS2G0. It has thicker races and is overall a harder and stronger bearing. The rods are stock length and Darkhorse has an extremely good reputation regarding crank work. The Andrews transmission gears are made from a stronger material than stock, and they use larger and stronger gear teeth than 2nd-5th of the XB gear sets. 1st gear of the stock XB transmission uses the larger, stronger tooth design. The tooth design is the same as the older sportster transmissions and makes for a bit noisier engagement. I am going to have the Andrews gear set backcut, cryo-treated, and micro-polished. Nick, I was interested in running the DDFI-III ecm but I didn't want to go through all of the work to rewire my bike, since I have modified so much of my harness to include the current electronic additions. With the turbo, I really can't use O2 sensors between the head and turbo to tune under boost conditions anyways. I will be watching individual EGTs and combined A/F ratio from a post-turbo wideband. | ||
| Motohead1125r |
Dumb question, can this setup be used in 07 cases, and if so, what mods to the cases are needed. Thanks | ||
| Munarin |
Doesn't the left side crank bearing press into the crankcase half and not on the flywheel itself? | ||
| Merc16 |
Bump for subscription. NewB question, are you going to post the whole rebuild with pics ? | ||
| Ericz |
The 2008-2010 crank fits right into the earlier 2003-2007 cases. The only mod you want to make to the newer crank is machine a timing mark on the right flywheel. The left side crank bearing does press in the case. Neither of the bearings press on the crank. I had Darkhorse size and fit the bearings in my engine case. You can see the right side bearing on the crank shaft. It is held there by a circlip. | ||
| Munarin |
Got it thanks Ericz my motor is out waiting for my new crank to be put in also. Not as nice as yours however. | ||
| Slaughter |
Peter, I've had Dahmer (Darkhorse) do THREE mods now with the 2008 flywheels in the older cases. Lets me take nearly 3 pounds of weight out of the flywheels because we take the timing off the cam position, NOT the magnet in the flywheels. | ||
| Motohead1125r |
Thanks for all the info guys, but I have a few more questions. 1.If you use the 2008-2010 crank, what items on the primary will also have to be changed. 2.Could you just upgrade the early style crank with the bigger crankpin, bearing and rods? or is there other improvements to the late crank. Slaughter: Does Darkhorse also do the lighting on your cranks, and if you did use a 2007 crank with a pin upgrade, could it also be lightened as much? Thanks again everyone, and have a great holiday. | ||
| Slaughter |
Yessiree the earlier flywheels CAN be lightened. Because I beat the crap out of them in racing, I have opted for the bigger crankpin diameter in the 2008 flywheels. Darkhorse can do the lightening and balancing. You need to give John the weights of the pistons - or ship them with the flywheels. The lightening really gives a crisp throttle response but it will come at the expense of durability. (that's why I opted for the bigger bottom end of the 2008+) because I've set a soft rev limit at 8,000 and hard limit at 8,200. The 2007 - you should ask John what he'd recommend. Timken bearing mods may do all you'd need. He (if I recall) has prices listed on his website - but if in doubt, send him an email. | ||
| Greg_e |
Not to get too far off the original topic, but what do you do to the valve train for that rev limit? Are you running a 9 crank or a 12 crank, are you concerned with the speed the pistons are traveling with that rev. limit? I realize it is only an extra 1000 or so from a stock 9, but the feet per minute of travel has increased a lot in the extra 1500-2000 rpm for a 12 crank. I'm not sure what the real limiting factor is with this engine, but I expect it is piston speed since it is a relatively long stroke. As far as machine work goes, couldn't a shop take a new large crank pin and machine the flywheels to receive that new pin? Just thinking this might be something that will help keep these engines going after stock parts dry up. Is the output shaft also a weak spot or was it just the crank pin? | ||
| Slaughter |
This is the short stroke (XB9) that I had built. I try staying away from the rev limit and except passing and starting, usually keep it down to 7500. The bearings were more a weak spot with shaft flexing. This was improved with the larger shaft. (or so I believe) Motor has held up well. | ||
| Kdogshirow |
Ericz , you are my Hero  | ||
| Bike_pilot |
Why is a lighter crank less durable? (Message edited by Bike_pilot on December 25, 2011) |
