Super3 build (SS/ST3) - Ducati.ms

jwemmenhove · Nov 1st, 2011, 3:23 pm

Hi all,

I thought I share my project with you. After having put a DS engine in my 1995 SS using Dellorto carbs, I decided to start building a track bike. After having read Pablo's adventure putting an ST3 wngine in his SL as well as a local Ducati tuner (Biggelaar) creating his B-rad (a ST3 engine with various components in Ducati Radical bodywork), I thought I'd better start something similar but kind of low cost. And being a frantic SS fan, it all became very clear......

So here's the idea:
SSie frame, SS swingarm (for so long. Anybody got an SS1000 for sale?), Ohlins shock, 999 forks, Brembo P4 34/34 calipers, ST3 engine (2004, the only year that would see a dry clutch!), Honda VTR carbs (48mm CV), a seperate ignition box (kinda like Ignitech), SS 91-97 bodywork, custom made exhaust headers 2-1 (for weight sake)......

There is a local track hero running the same carbs in a DS engine, so it must be possible.

Engine-frame-forks:

Carbs (apparantly the biggest ever put on a production bike):

The engine does fit as soon as the frame lugs are bored to 12mm.
The front fairing frame of a 91-97 SS does fit on a SSie frame as soon as both bushes that are welded onto the frame are made narrower.
Making the 999 forks fit has been well documented: bore the upper triple to 53 (was 50) and I made a sleeves out of copper sheet (0.5mm thickness) to fill the lower triple. Mind you: using 999 forks will require front brake rotors with 15mm offset (instead of the regular 10mm). Which is a challenge in my situation as I want to use 5 spoke wheels (6 holes per brake rotor). Only 6-hole rotors with 15mm offset were used for R models back then (748R, 996R, 998R). So, I opted for some spacer rings made by Braketech.......

To be continued.....

Spezjag · Nov 1st, 2011, 4:11 pm

This looks to be a very cool project - is it for street or track? I know the Brit magazine Performance Bikes has had a couple of specials using the ST2 motor (most recently the Radical Ducati 9-1/2), but this is the first I have seen using the ST3 motor (which by all accounts is a better engine).

Good luck, and keep us posted!

amehl · Nov 1st, 2011, 4:35 pm

more info in the brake-tech spacer rings please. Do they space out the rotor or the caliper? where did you get them? I cant find them on the site.

jwemmenhove · Nov 1st, 2011, 5:26 pm

Amehl,

Check Braketech's website, open the product fitment pdf:
"5mm Spacers for the BTD-10 series rotors (15mm total offset), black - each BTD-6480 30.00"

Each spacer is mounted inbetween disc rotor and hub and thus making those run "wider".

amehl · Nov 1st, 2011, 5:38 pm

YIKES $30 each?! I will make my own or have a shop do it. Thanks for the info, your bike looks great.

Kiwihame · Nov 1st, 2011, 7:42 pm

Thanks for sharing.

Like the big H carbs idea! (Makes it a Honking Duc?) It would be useful to do a 'before and after' dyno test to determine their effectiveness. Even better against 41mm FCRs. Would also be interesting to see what they do to your bottom end. You'll probably need to go to big bore headers. What sort of inlet manifolds will you use?

jwemmenhove · Nov 2nd, 2011, 2:07 pm

The carbs themselves are a nice fit to the standard inlet manifolds; both carbs are downdraft so that's nice too. There's 1 issue though: they are mounted in a frame and it's a push-pull cable setup to 1 carb. The other carb is controlled by a shaft from the first carb. That setup does not fit; I'm thinking of makling it a double pull cable setup (1 cable to each carb) using a Guzzi throttle control.

As soon as I have a pic, I'll put it here....

Quote:

Originally Posted by Kiwihame

Thanks for sharing.

Like the big H carbs idea! (Makes it a Honking Duc?) It would be useful to do a 'before and after' dyno test to determine their effectiveness. Even better against 41mm FCRs. Would also be interesting to see what they do to your bottom end. You'll probably need to go to big bore headers. What sort of inlet manifolds will you use?

ENGAKATS · Nov 2nd, 2011, 3:03 pm

This is definitely an interesting project. Wonder though why you didn't choose a pair of FCRs. Cost?

jwemmenhove · Nov 2nd, 2011, 5:05 pm

Yep, exactely that and the fact that these are bigger is nice too (even though effective area should be a little less due to the butterfly valve in the venturi, but still).

It's weird though; Honda in all their wisdom decided not to take identical settings for front and rear carb; there are differences in main jet size, type of emulsion tube and velocity stack length. That's why I'm considering using 2front carbs (and that makes it easier to use a seperate throtle cable for each carb as well)

LeoLegend · Nov 3rd, 2011, 10:33 am

If it were me I'd ditch the CV carbs for some flat slides. cool project!