K1100 + LDW903 (in progress)

[jef_k75]

K1100 frame / driveline
Lombardini LDW903 (900cc 3cylinder watercooled 21hp/3600rpm)
final drive oem 2.54/1 from bmw R1200C (standard K1100 is 2.81/1)
10-11% longer 5th gear from wolfgang kayser (top speed between 120-130km/h)

[pietenpol2002]

Welcome Jef and thanks for starting a build thread. Yours is the kind of machine we need to see more of. I've begun the collection of bits for my next build by starting with a K100 trans. So, I'll be interested in how yours works out. Looks great thus far and do keep them coming.

[zarquon]

This looks very good to me! I really like these Konversions.

Here are the other ones as a motivation.


Modite 1 von bigzark auf Flickr


Untitled von bigzark auf Flickr


K100 Daihatsu, die 4te von bigzark auf Flickr


BMW-Daihatsu K100 TD von bigzark auf Flickr


Fällt im Vorbeifahren niemandem als Dieselmotorrad auf von bigzark auf Flickr

[XLerate]

My planned bike build, Lord willing I ever get started and finished on it, will be chain drive just to make life mechanically easier. I do however drive a vintage Dodge truck with a Cummins 4BTA Conversion and a New Process NV4500 5 spd. transmission. From that truck build experience I ask: what sort of adapter is used to mate these diesel engines to the gearbox and to enclose flywheel & clutch?

Fortunately the Dodge Cummins 6BT diesel truck's tranny adapter worked for my conversion but I doubt such an adapter is available off the shelf for bikes with diesels?

[jef_k75]

My planned bike build, Lord willing I ever get started and finished on it, will be chain drive just to make life mechanically easier. I do however drive a vintage Dodge truck with a Cummins 4BTA Conversion and a New Process NV4500 5 spd. transmission. From that truck build experience I ask: what sort of adapter is used to mate these diesel engines to the gearbox and to enclose flywheel & clutch?

Fortunately the Dodge Cummins 6BT diesel truck's tranny adapter worked for my conversion but I doubt such an adapter is available off the shelf for bikes with diesels?

these adapters on motorcycles are home made, the difficult part is the alignment between clutch and gearbox
we (me and my father) used 3mm sheet metal to fold/cut/weld the sides and 2 larger plates with the required holes at engine and gearbox side (the one on gearbox side is home made, the other plate was already mounted on the engine and re-used)
the original flywheel has been turned to hold the clutch, an original bmw adapter is used as a template for the holes








other adapters:

[XLerate]

Interesting, Jef, thanks for the pictures!

I imagined you must have fabricated a housing, no other choice. Nice work, looks like a factory piece! Like they say, do it right the first time, and it looks like you did just that...

Going to be one very cool ride there!

[jef_k75]

cold start first run, can't get the video embed so here is the link
still needs a lot of work

http://www.youtube.com/watch?v=B23gzAgemsg

[Rhynri]

Am I the only one the images are broken for? I can't tell. I am really interested in seeing them too!

[coachgeo]

Am I the only one the images are broken for? I can't tell. I am really interested in seeing them too!

At the time printed for my post..... they work for me.

[coachgeo]

cold start first run, can't get the video embed so here is the link
still needs a lot of work

http://www.youtube.com/watch?v=B23gzAgemsg

So how much over all length increase?

Where is the length added? Behind drivers butt? 1/2 before 1/2 after orr??

[jef_k75]

cold start first run, can't get the video embed so here is the link
still needs a lot of work

http://www.youtube.com/watch?v=B23gzAgemsg

So how much over all length increase?

Where is the length added? Behind drivers butt? 1/2 before 1/2 after orr??

0,0 length increase, standard frame, gearbox and final drive from K1100LT front fork is K75RT but the angle etc. is all to original specs
5th gear is altered to be 11% longer and a 2.54/1 final drive

right side of the frame had a little cut off and bended tube welded to hold the engine, radiator in a different angle

maybe i should have searched for a lombardini ldw 702 then i wouldn't have to cut the right front frame downtube and then the original bmw radiator could be fitted in original angle/mounts only little less power but probably even better economy
top speed around 125km/h (there is power for more speed but the gears won't allow it)

[coachgeo]

Nice.... no length change.

Question.... referring to below picture. The tube from front bottom corner of radiator area to the rear swing arm area.... is that a support member like the opposite side with the attachment to frame sorta hidden by radiator..... or is that a coolant pipe to the rear gears? Hard to tell due to piping and its color is different that that of the opposite side's structural member.




PS- As a moderator and decades long user of bulletin boards.... if you can.... please post these pics to this board where they will be better archived with in threads instead of on a different site (imageshack) where they often get moved around, deleted etc.... rendering a once good thread here as useless w/lots of little red x's where the pics use to be.

[henneberg]

Hi Jef,

Thanx a lot for your detailed information.

I have a 1984 BMW K100RS that could fun to implant a diesel engine, but I am looking for an engine that fits without any frame modifications.

Are the K100 and K1100 frames the same in terms of the space from gearbox to the front down tubes ?

The overall lengths of the LDW702 and LDW903 are 421 mm and 510 mm :

Would the difference of 510-421 = 89 mm leave enough space to avoid frame changes ?

[jef_k75]

Hi Jef,

Thanx a lot for your detailed information.

I have a 1984 BMW K100RS that could fun to implant a diesel engine, but I am looking for an engine that fits without any frame modifications.

Are the K100 and K1100 frames the same in terms of the space from gearbox to the front down tubes ?

The overall lengths of the LDW702 and LDW903 are 421 mm and 510 mm

Would the difference of 510-421 = 89 mm leave enough space to avoid frame changes ?

i believe the frame size is almost identical except the frame of a K1100 is stronger/heavier
the ldw 702 should fit without any frame modifications as far as i can see

Nice.... no length change.

Question.... referring to below picture. The tube from front bottom corner of radiator area to the rear swing arm area.... is that a support member like the opposite side with the attachment to frame sorta hidden by radiator..... or is that a coolant pipe to the rear gears? Hard to tell due to piping and its color is different that that of the opposite side's structural member.

you are correct it is part of the subframe to strengthen the frame and hold the engine
i could 've welded it in 1 piece but made it removable for service as you can see below

[henneberg]

Hi Jef,

How is long the tranny adapter in your build ?

just to figure out the available space from the engine adapter mount to the front tubes mounting eyes,

[jef_k75]

Hi Jef,

How is long the tranny adapter in your build ?

just to figure out the available space from the engine adapter mount to the front tubes mounting eyes,

it's close to 12cm (11.8cm-11.9cm)

[henneberg]

Hi, thanx again, I like the detailed pictures of the build process.

How long would you estimate the blue distance in the following snip to be:

[jef_k75]

Hi, thanx again, I like the detailed pictures of the build process.

How long would you estimate the blue distance in the following snip to be:

LDW 903 frame-engine left.jpg

a little over 300mm

[henneberg]

Thanx for info.

At the time being, I am considering if a Kubota D722 or Yanmar TNE68 would fit into the BMW K100 frame without modifications or flexing.