[SBK Project: 2v Motor - 748/996 era Frame]

[junior varsity]

Here's where we are at, pics:













You can see the crack on the motor mount here:


This is the spacing at issue, where the cases would need to be machined for stuffing into a SBK frame/swingarm.


You can see here where the swingarm pivot hole could be machined lower by a smidge.


Dirty but fine ol' heads.

[junior varsity]

748 cases are here. They look fine --> Test fit the cylinders: They slide right down the studs with no issue... until you get to the face of the cases: Locator pin is in the wrong position. Looks like I'll need to have a second locator pin-hole on these cylinders so they'll bolt up. Oil-ways look like they lineup.

Bearings are bad most everywhere on the new cases. Many are missing or only have the outer races in place.

I'll take some pics of these cases which show the differences in the machining done at the swingarm pivot faces.

[Monsterlover]

[junior varsity]

Educate me on shift / transmission drums, please.

I understand there are different part numbers, why? (Don't tell me "the parts are different" - elaborate please as to which bikes used different shift drums and why I may not be able to swap one in...)

Because I may have acquired a lightweight one.

[Düb Lüv]

just random searching, but i found a corse aluminum transmission drum that was on ebay that FBF was selling. sold for $100.

since you were on the lightweight gearbox thought.

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=390183328324&viewitem=&sspagename=STRK%3AMEWAX%3AIT#ht_839wt_1112

just a thought

[junior varsity]

The internals of the RS motor would have a roller shift detent, alumnium shift drum, roller style shift forks, I beam Pankl Ti rods, HC high dome pistons usually Omega, kick ass cams and a whole bunch of other stuff like a slipper clutch, Corsa Breather ect.

From: http://www.speedzilla.com/forums/general-ducati-chat/59744-996sps-vs-996rs.html#post600172



Wonder how hard it is to find roller shift forks, or if they are necessary (or just better, but not required)

[Monsterlover]

I doubt they're necessary.

They'd make for smoother shifting, I'd guess. . .

[junior varsity]

I'll grab the roller pawl arm from Factory Pro when I do it, so that should smoothen things out some more. Wonder if there are line-up issues for an RS motor. As I have just learned from above link, they are nothing like the SPS.

[Speeddog]

No FHE here, but I think if you use non-roller shift forks with an aluminum drum it'll ruin it.

[Monsterlover]

That makes sense.

The pads, or ends of the forks, would be harder than the aluminum drum

Essentially you'd be machining the shift drum every time you shift

Better find those roller forks. . .

[junior varsity]

Any ideas on where to get?

I suppose I should shoot Ferracci an email since they were in to these quite a bit. I suppose Nash at AMS might know also since he did AMA big time back in the day.


Any other ideas?

[junior varsity]

Here's a quick test fit I did to see what it would look like. 900 2v heads and cylinders in 748 cases, 748 oddity frame, black pc'd swingarm.

Everything was just loosely thrown together to get an idea, so there are some pretty clear assembly errors.


You can see easily the area of the frame in front of the vertical head that will need modification for the intake manifold/carb:





Current progress of 900ie dissassembly, shown below. Time to yank the primary gear and the driven gear, pull the crank and have it done up nicely.



Certainly more troubleshooting is in store for me, and more questions, but so far so good: Quite exciting to say the least. It would be much easier if I had a big pile of money and didn't have to take a break soon and let the bank acct rebound before the next surge. (I mean, when the motors getting its thing done, I'll be able to start looking at suspension - forks, damper, shock; triples, bars, rearsets, and eventually start contemplating exhaust options.)

[Monsterlover]

This is a great thing you are doing.

I applaud you efforts.

[junior varsity]

I'm trying to see which fun things I can do as I go. Just got word back from Jeff on the Alu Shift Drum. Looks like a no-go - he said they were often trashed after a few races, not something I'm interested in. We'll see if it would be subject to the same stresses in my motor, but I think that's going to get sidelined for now.

So, planning-wise we are still looking at a:
+  944 or 966 HC
+  VeeTwo Race Cams on Adj. Pulleys
+  Lightweight Primaries, Lightweight Flywheel, Lightened/balanced crank
+  Custom Exhaust (necessary)
+  Split Single Keihins
+  ignitech ignition with dyna coils - should be able to use the IE's air-gap pickup off the timing gear (fingers-crossed)
+  Modified frame-cross brace for intake

?  Haven't figured out forks or brakes yet (since they go together so far as the fork-bottoms are concerned)
?  Haven't figured out triple clamps (wonder if its gotta be 748/996/998 or could 749/999's bolt up, if this put damper mounting at issue...)
?  Haven't figured out damper, shock
?  Haven't figured out wheels, rear brake caliper/mount/rotor just yet. (Wondering whether i want a bracket with a speedo-pickup or not)
?  Haven't figured out tank - was looking at ETI's, but i need it to be a simple "out" port, no internal pump/etc needed.
?  Haven't figured out bodywork (tail, 2v long belly pan or oil catching 4v belly pan with individual mounts, "headlight" fairing, sans headlight - may stick a headlight in one of the air ducts though, run a tail with lights so its "street legal")
?  Haven't figured out wiring yet (going to do my own 'harness' - i like the idea of the motogadget m-unit)

Not sure what I'm forgetting. Plan on taking my time with each part, that allows me to get it right, have it powdercoated or painted the way I'd like, and get a few more Ti bolts in assembly so its as light as it could be.

According to Bikez.com,

Dry Weight for a 2002 748 was 432 lbs / 97.0 hp / 53.8 ft-lbs

2002 M900ie came in at 416 lbs / 78.0 hp / 53.8 ft-lbs

I'm hoping for sub-400 lbs, quasi-street legal, and mid-90's hp, and superbike geometry. I am hoping to be able to give a good run against most middleweight Ducati superbikes (rider skills being equivalent). I'm certainly not gunning to be faster than an 848, its weight is at 370, 134 hp, 70 ft-lbs. Sheesh!

[1KDS]

?  Haven't figured out triple clamps (wonder if its gotta be 748/996/998 or could 749/999's bolt up, if this put damper mounting at issue...)

749/999 and 848/1098 have a 1/4" shorter stem.  Looks like you have the non-eccentric headstock, I have an upper and lower for that unit, PM if you like