BMW R1200R R1150R/T F800 K1200R R1100R/T R1250R RnineT Message Board

Leaving aside the Computer & Electronics as I'd use the R1150r
wiring & gear - Reflash or stand alone ?

Will A Cam Head Engine Bolt up to - into an R1150r ?

The oilhead is a totally different machine. I don't know anyone or have I heard of anyone trying a conversion? like this.

Can it be done? who knows but the bigger question is WHY? If you want a "cam head" then for a bunch less money and trouble just buy one. The newer machines are lighter and improved quite a bit and your conversion project would be a giant step in the wrong direction.

I have spent some time on the 1200 in Europe and it is a bit faster than my 1150. The balance shaft is just there to dampen the shaking caused by the offset cylinders and is really only noticeable when the revs are up around 6,000 or higher.

To me it isn't enough to trade my 1150 for and the CANBUS electrics on the 1200 make visits to the dealer,(good bet), for problems with that system. You can maintain an 1150 with a good digital multi meter.

I posted this out of curiosity as to your motivations for such a huge/weird project. If you did it (if its possible) I believe you would have a real red haired step child.

That may be what your after???

I'm not one to discourage creativity, but have to agree with kirby's comments. I'm not aware of any such camhead-into-oilhead transplant, but there were photos online of a hexhead "custom" that used R1150R gas tank (minus the R1200 airbox) IIRC.

Take a look at each bike's subframes for comparison of mounting points. Starting with the hexhead, the subframes became more complex and "spidery".

My favorite boxer motor transplants are/were done by a German, with oilhead-into-K75 frame my favorite. I have photos somewhere of his creations, and a former member here (also from Germany) forwarded some info about the build process ("very complex frame fabrication").

I'm all for stuff like this....I've got no problem in doing it just becouse you can, I'm definitely in the 'I can do better than the factory' camp
Any reason for trying it? Very much doubt it's been done before. Is it just the engine or the whole lot? It would be pure luck if the motor matched up with the gearbox and the 1200's front frame is tubular steel as opposed cast ally for the 1150.....very different in form but then it's all about the mounting points.

Can you?
Ha!
How about a Merlin V12 in a mini! What good would it be. If possible I figure it would be a giant/sad waste of talent.
But then I just saw pictures of a radio controlled 50% scale replica of a B-17 WWII bomber. Took 17 years to complete!

so as the song says "whip it..whip it good"!!

Ohh I'm not saying it's a good idea particularly........as a one off it wouldn't be particularly 'special' and as a way of keeping a 1150 with a dead motor on the road not particularly cost effective.
I've toyed with the idea of building a oilhead dirt bike....bit of a HP2 type thing....but to be honest I don't think I can be bothered to spare the time and money anymore, I'm happy at the momment putting petrol in the tank and taking off somewhere I've not visited before.

Try a R1100GS (or a R80GS if you can find one), Took me across the Andes and much much more!
Doubt anyone could do much better with a oil head...for the cost and service.

if you have a dead engine, just get the same new engine.

I say there's nothing tangible to be gained from that motor swap, and there would be MUCH difficulties. so much so, that the extra few HP wouldnt be worth it.

Love me some engine swaps though.

Reasoning ?

The R1150r swing arm directly mounted to gearbox - I like the clean look & direct attachment ,
which BMW left to go back to Trellis Subframes .. seems crashing with swing arm damage
necessitated a gear case in some instances .

The rounded sculpted lines rather than hard crease beauty lines for the R1200 r line .

The Electro-Hydraulic ABS III anti-lock braking - preferring lite touch accuracy to
Gorilla Grip .

I pursued the research and Survey Says : No ..

The R1150r engine case is designed to mate to the swing arm mounted
to transmission case - case - so the engine case must be kept .

Haven't found if a Cam Head Cylinder Head can be made to work on an OIl or Hex head engine yet .

I do know the Cylinder Studs are spaced further apart on the Cam Head allowing
it to be bored out to 105 mm vs 103 Oil / Hex Head .. but it would be the
cam chain drive alignment which would be the determining factor.

But the R12s cylinder heads take no prisoners .

As it is .. everything on an R12s engine will fit the R1150r engine case including
the Stroked 73mm factory crankshaft vs 70.5 R1150 .

I'll hold out to find a Silver 2005 R1150r .. then the fun begins in Earnest .


T

Tourville wrote:...As it is .. everything on an R12s engine will fit the R1150r engine case including
the Stroked 73mm factory crankshaft vs 70.5 R1150...

I'll hold out to find a Silver 2005 R1150r .. then the fun begins in Earnest .

Cool. There have been few "custom" projects using R1100/1150/1200R bikes, here or elsewhere. Or any Oilheads for that matter.

I'm always drawn back to the original R1100RS design brief, with the introduction of Telelever, and the simplicity of the underlying stressed engine/transmission + subframes configuration.



After the R1100/850 bikes, each successive boxer family adds compleixity to the original design. With the LC bikes, the original design brief has been largely abandoned... but the resulting motorcycles are very good.

I like the idea of this, but the feasibility just doesn't allow it. I love the overall looks of the R1150R but would love to have a newer R1200 motor in it - the best of both worlds! I need a new bike...

find a wrecked r1200c(the cruiser abomination), and slam it in there? it the same motor as he 1150 just . 1170cc vs 1130.

2mm longer stroke or something......?

not sure what power thatll get you... but Im PRETTY sure the external dimensions are all the same???