748 > 996 conversion?

All the single injector looms are the same as far as I am aware, a mono rear loom is longer though. Fitting the 996 chip would be all you need to do or have the ECU chip reprogrammed and set up by someone like CJS but that's a lot more expensive.

The rest should be fine, fundamentally you need to run a three phase rectifier with a three phase stator, all the rest of the loom will be fine and will mate up.

If you compare wiring diagrams in the Haynes manual for the appropriate year you will find it is quite clear. There might be some minor changes you have to make to the rear brake switch depending on where it is routed through the loom, some earth via the headlamp wiring I seem to remember, you might want to check the oil light feed as well.

The only other problem you might have to deal with is the frame or engine mounting bolt holes as early ones are 10mm and later 12mm.

There is a good write up on this in one of the eBay reviews about engine swapping between models. I used this when I fitted a 748R engine in a 748S\Biposto early frame.

 

Can't wait to see this one fire up. :wink:
Steve

 

+1

im following this thread with interest and would like to see pics of the progress..i wish i had the technical expertise/tools/temperament to take on these jobs...oh well, suppose i'll have to fall back on my wit, charm and good looks yet again.:redface:

 

It might be best to try both if you can get hold of them cheaply. The real way to go is to get a custom map on your chip. I had to do this with my 748R because it used stock 748 injectors and airbox and a few other things. Proper setting up can reveal some good horsepower so the investment can be worth it.

Note the mention about the number of pins for the wiring harness, I overlooked mentioning this above as I assumed you would have the complete harness, 22 pin is the way to go but in fact you can mate them you just have to move things around a bit.

This is the comment from Gotham cycles I mentioned earlier, there's some useful information here.

I sell a lot of motors to customers who have 748/916/996 Ducati Superbikes. If they have a blown motor they ask me for advice on replacing it with either the same size motor or upgrading to a motor with a larger displacement. As it is with most things in life, it depends... I wrote this guide to try to cover everything that should be taken into account before deciding which route to take because there are a few things in addition to the motor itself that need to be considered.

Ducati 748/916/996 Superbike are more similar than different, but there are differences besides just displacement. I have tried to list some of the differences below.

The throttle bodies on 748's and 916's are single injector while the 996 has dual injectors. Although the 748 and 916 both have the single injectors, the 748 has 45mm intake manifolds while the 916 shares 50mm intakes with the 996. The rear ECU wiring harness that connects the ECU to the injectors is also different. The 748 and 916 harnesses have connections from the ECU to the single injectors while the 996 wiring harness has dual injector connectors.

The ECU's of all 748 / 916 / 996 Superbikes from 1997 onwards use the same Magnetti Marelli 1.6M ECU. The 916's from 1996 and earlier and the SPS models have the P8 ECU and a P8 specific wiring harness. The 1.6M ECU does not have to be changed if converting between a 748, 916, or 996, however, the EPROM chip inside the ECU, is specific to the bike. Therefore a 916 or 996 EPROM chip for the 1.6M ECU would be required if converting from a 748.

748's don't come stock with oil coolers while 916's and 996's do. The radiator and the rest of the cooling system is the same though.

The years of both the recipient bike and donor engine also matter. The 748's and 916's from 1998 and earlier have 2 phase alternators / regulators and have 19 pin connector wiring harnesses. The 748's and 996's from 1999 onwards are 3 phase and have 22 pin connectors on the wiring harness.
So if you are installing a 996 engine into an early 748 you will need the 3 phase set up and wiring harnesses.

In 2001 Ducati changed the timing sensors and clutch slave cylinders. Also in 2001 the frame / motor mount bolts changed from 10mm to 12mm on both the 748's and 996's. So if you are installing a 2001 motor into a 2000 or earlier frame you will need to either use the 10mm bolts with sleeves through the crankcases or use the 12mmm bolts and bore out the frame mounts 2mm. If you are installing a 2000 or earlier motor into a 2001 frame you will need sleeves in the frame. I would not recommend boring out the crankcases 2mm.

So what does this all mean? IMHO if you have a 1997 or 1998 748 with a blown motor you should consider either another 1997-1998 748 motor or convert to a 916 motor. Of course you can convert to a 996 but it will require more parts and more work. If you have a 1999 or later 748 with a blown motor you should definitely consider the 996 conversion but you still need to keep in mind all the differences between the years and parts.

Other things to consider. The internal gearing of the motors is different so you might want to think about this when you choose sprocket sizes. Also, one added bonus of upgrading engines is that depending on your state, your insurance will most likely stay the same even though you effectively have a different bike.

You can also do conversions from 748 to 998 or 999 motors but that requires more modifications / parts and is beyond the scope of this guide. Some of my customers have done those conversions though so it is possible.

 

Your upgraded rec will have the third wire to connect to the three wire alternator won't it ?
Steve

 

^^ I'd be interested in the answer myself as single phase and three phase use different alternator setup's one revolving inside and the other outside the alternator windings.

It also mentions the timing sensor and these are interchangeable and all will connect to either loom, the three phase has either one or two bolt sensor mounting and again these can be plugged straight into the loom. I have found you can use an early loom with a three phase setup and vice versa if you are prepared to do a little rewiring.

The best answer is to go all three phase though, I hope the rest of the information was of some use.

 

As far as I am aware the Shendingen reg is a three faze reg and when used on a two faze bike one of the three wires is not used.
I stand to be corrected.
Steve

 

Try JHP for a chip, they have so many, sorted me out for the 853 .
Steve

 

Go full hog, stick a 1098 or 1198 in it, go on you know you want to, theres a few on ebay

 

Surely it is the couriers responsibility, not the sellers.

 

It sounds a bit suspicious, it's not a scam is it?