Engine swap?

Tamburinifan · Post by **Tamburinifan** » Fri Jun 22, 2007 8:21 am

Has anyone put an ST2 engine in a 907?
Straightforward or tricky?
I know there are some issues w swingarm.

Gert

persempre907 · Post by **persempre907** » Fri Jun 22, 2007 12:34 pm

It seems to me, the ST2 and 907 engines are a little bit different, above all for the fix points at the frame.
But, someone has put the 888 engine on the Paso's frame.
Antti, a member of this forum, has both an ST (but the ST4s) and a 907.
I think he can tell you a competent advice.

But, why do you want put the ST engine on the 907 frame?
You will not have much more power.
So, why don't put a quattrovalvole engine?

Ciao

Tamburinifan · Post by **Tamburinifan** » Fri Jun 22, 2007 12:50 pm

So cases are that different, are you sure?

Do not like 4V, to buzzy etc. ST2 considered one of the best 2V Ducati made.
Fells like I`m gonna keep this for a long time and could be an interesting project down the road.
And sometimes it`s fun to do something just to see if it can be made!

Gert

persempre907 · Post by **persempre907** » Fri Jun 22, 2007 3:40 pm

As I told you, I can't be sure.
No matter, the engines of the 907 and of the ST are very similar, so I wouldn't do it.
I'd try to find the big bore kit, if you can't give up to 40cc

.
Ciao

ducapaso · Post by **ducapaso** » Fri Jun 22, 2007 5:39 pm

I heard about putting 944 ciliders in a 907 engine, in a racing bike, but I can't remember when or where

In this site you can find something about crankshaft compatibility

http://tinyurl.com/y3tcgn

persempre907 · Post by **persempre907** » Fri Jun 22, 2007 5:44 pm

ducapaso wrote:I heard about putting 944 ciliders in a 907 engine

Yes, I also heard the ST2 944 cylinders and the pistons can fit on the 907 engine without any modification.

Ciao

Tamburinifan · Post by **Tamburinifan** » Fri Jun 22, 2007 11:59 pm

Had my engine out of frame 3 times now on my M900 so the swap´s no big deal.

But maybe the 907ie & ST2 engines are closer in spec than I know of? Cams, compression & displacement at least are different.

This looks tempting:
http://www.moto-one.com.au/performance/st2hicomp.html

Gert

Ducman · Post by **Ducman** » Sat Jun 23, 2007 1:09 am

Here's an alternative from FBF

These Forged CNC machined high-compression piston kits are manufactured specifically for Ducati's nikasil cylinders for a perfect fit. Kits come complete with pistons, rings, pins, and clips for drop-in convenience.

Price: $289.95 - $389.95

Qty:
Options: M600 80mm High Comp. 11.5:1 ($289.95) M750, 750ss, Sport, F1: 88mm High Comp. 11:1 ($349.99) M750, 750ss, Sport, F1: 88mm High Comp. 12:1 ($389.95) M900, 900ss, 907ie, 906, E900, 92mm High Comp 11:1 ($289.95) M900, 900ss, 907ie, 906, E900, 92mm High Comp 12:1 ($289.95) ST2 94mm high Comp 11:1 ($349.00) ST2 94mm high Comp 12:1 (race only) ($389.95)

Tamburinifan · Post by **Tamburinifan** » Sat Jun 23, 2007 8:43 am

Knowing that Ducati don`t change so much between models and often use parts from different models, maybe the ST2 engine is just a 907 w different cams & 944 kit?

Gert

Finnpaso · Post by **Finnpaso** » Sun Jun 24, 2007 7:29 pm

Gert, U are very close.... And ST2 engine have newer M16 ECU with only one pick up. 907 have 2 pick ups.... That can be "the problem" to swap ST2 engine to 907 electrics....

If so, then better add also M16 ECU...

Btw, mounting points are same in both 907 and ST2 engines and ST have curved radiator. Its easy to add 944 (ST2) sylinders and pistons to 907 engine. ST2 have much better cams, than 907.

persempre907 · Post by **persempre907** » Sun Jun 24, 2007 8:29 pm

Antti,
what are the differences beetween the 907 and ST2 cams?
Ciao

Tamburinifan · Post by **Tamburinifan** » Mon Jun 25, 2007 12:43 am

I`ve been told 907 has SS cams but that don`t match the specs here in the 907 FAQ:

Inlet valve: 43 mm diameter
Opens before TDC 20 degrees
Closes after BDC 60 degrees
Exhaust valve: 38 mm diameter
Opens before BDC 58 degrees
Closes after TDC 20 degrees

Check differences on Duc cams here:
http://www.moto-one.com.au/performance/duccamspec.html

Good news about engine mounts!

Gert

Finnpaso · Post by **Finnpaso** » Mon Jun 25, 2007 1:53 pm

As told, differences here:

http://www.moto-one.com.au/performance/duccamspec.html

and also can be found from Ian Falloons book: "Restoring and modification of Ducati belt drive two valve twins"(side 212 from that book)

Anyway one "head guru" here measured my 907 and ST2 cams and he told, that those from ST2 are much better ones. I trust him over 100%. He explaned also, why, but i cant remeber all.... I am old man already and leave these things soon....

persempre907 · Post by **persempre907** » Mon Jun 25, 2007 2:37 pm

Do you fitted the ST2 cams on your 907?
Ciao

Finnpaso · Post by **Finnpaso** » Mon Jun 25, 2007 3:14 pm

Yes! ST2 cams....

Also porting job to heads, K&N, Open exhaust(Conti), lightened flywheel, Light 48 teeth STM clutch, Finetuned(!!!) FIM eprom(tuned 7.4% richer in hole area for MORE power), FIM AMB(i have P7 ECU), Z=46 rear sprocket, etc....

Front wheel is quite light, when open throttle.... :laugh: :laugh: :laugh: