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View Full Version : K100/ K1200 engine swap

pfls
05-15-2006, 04:24 PM
I am toying with the idea of trying to put a K1200RS engine into a K100. I know that there will be all kinds of problems to overcome and that the motor will not make all of it's horsepower without the proper intake and fuel injection systems. My question is, has anyone ever done this before, and if so, how satisfying were the results?
jdiaz
05-15-2006, 05:00 PM
I have a K1200 stripped down next to my K100. The forward engine block mounts look identical. You would need to use a K100 trans in order to mount the works in the K100 frame, and probably have to mess around with the clutch pack since the 1200 would certainly overwhelm the stock K100 pressure and friction plate.
pfls
05-15-2006, 06:38 PM
I believe that both engines use the same casting for the block. Bolting it into the frame should not be a problem. You are right, a K100 transmission must be used, or a K1100, which is built a little stronger internally. The intermediate flange must be changed to do this. The clutch will probably need to be a K1100, I think that the input splines changed with the K12. My worry is that a K100 airbox will not allow the motor to breathe enough to make it all worthwhile.
jdiaz
05-15-2006, 08:21 PM
Put carbs on it! A rack of downdraft carbs would look kinda neat.

But the vibration is probably not going to be pleasant. The 1200s definitely don't buzz less than the 1000s, which is why they rubber-mounted them.
SheRidesABeemer
05-16-2006, 08:33 AM
I am toying with the idea of trying to put a K1200RS engine into a K100. I know that there will be all kinds of problems to overcome and that the motor will not make all of it's horsepower without the proper intake and fuel injection systems. My question is, has anyone ever done this before, and if so, how satisfying were the results?

Why?
Stuff2C
05-16-2006, 08:35 AM
Sleeper Value. Like putting a big block in a Ford Falcon. :D
pfls
05-16-2006, 02:24 PM
Why?
I have most of the stuff needed already, and like to tinker. It won't really be a sleeper, because the engine covers are different, and it will have an oil cooler, but it will be a little different.
vanzen
05-16-2006, 06:43 PM
Why?

because it just could be possible ...
with a little personal involvement, of course.

"could be" and "personal involvement" being the operative terms.

For some people ( myself included ) no other reason need be required.
bmwmick
05-16-2006, 07:47 PM
I have most of the stuff needed already, and like to tinker. It won't really be a sleeper, because the engine covers are different, and it will have an oil cooler, but it will be a little different.

So Paul,
You want me to forward the .doc file I got from a guy over on K11OG? He transplanted a K12RS (or LT) into his K1100RS and wrote some notes along the way.
One more thing......can I take it for a ride when you do it?
:bikes

Note courtesy Paul Van Valen
jdiaz
05-16-2006, 07:50 PM
So Paul,
You want me to forward the .doc file I got from a guy over on K11OG? He transplanted a K12RS (or LT) into his K1100RS and wrote some notes along the way.

Does he want to sell the K1100 cams? They are supposed to perk up the 1200LT motor a bit.
bmwmick
05-16-2006, 08:02 PM
Does he want to sell the K1100 cams? They are supposed to perk up the 1200LT motor a bit.

I guess you could ask......I sent you mail. :drink
bmwmick
05-16-2006, 08:03 PM
Why?

C'mon Gail,
You KNOW it's NEVER good enough the way it came from the factory. :wave
Didn't you grow up dropping bigger and bigger engines in your Chevy's? :stick
rinty
05-16-2006, 11:09 PM
I always wanted to drop a GM 3.8 V6 into a Volvo 242, or a Cosworth 2 litre 4 into an MG-B, or a 289 into an XK-E......

Rinty
Mika
05-17-2006, 04:47 AM
The 289 should go into the MG, makes an interesting ride though the foot wells become cramped.
Stuff2C
05-18-2006, 12:31 PM
Why?


OK, Someone had to say it. Gail, bigger is always better...Right?




Also if there was ever a question check this out...http://www.ford-v8-focus.com/
BubbaZanetti
05-18-2006, 12:42 PM
Why?



same reason i thought about putting an airhead engine in my oilhead, and that makes even LESS sense
Stuff2C
05-18-2006, 12:48 PM
same reason i thought about putting an airhead engine in my oilhead, and that makes even LESS sense

It would be an improvement over a K75. :brow
bmwmick
05-18-2006, 02:41 PM
OK, Someone had to say it. Gail, bigger is always better...Right?




Also if there was ever a question check this out...http://www.ford-v8-focus.com/


Shush!
SheRidesABeemer
05-18-2006, 02:49 PM
OK, Someone had to say it. Gail, bigger is always better...Right?

Also if there was ever a question check this out...http://www.ford-v8-focus.com/

This must be a guy thing. Take a nice K12 engine and jam it into a bike with 20 year old technology...next thing you'll need is a new brake system to stop the 20 year old bike with the new engine.Then you'll notice the K100 isn't as aerodynamic as it could be with the nice new engine....so you'll be looking for the body panels off a K12RS. But they won't really fit the frame right...
rinty
05-18-2006, 05:47 PM
Gail:

Us guys thought it would be insensitive to say it to PFLS, so it's just as well that you said it.

Rinty
CARVERBOATBOY
05-18-2006, 11:49 PM
This must be a guy thing. Take a nice K12 engine and jam it into a bike with 20 year old technology...next thing you'll need is a new brake system to stop the 20 year old bike with the new engine.Then you'll notice the K100 isn't as aerodynamic as it could be with the nice new engine....so you'll be looking for the body panels off a K12RS. But they won't really fit the frame right...

See you do understand :D http://w6rec.com/duane/bmw/BMW-VW/index.htm
pfls
05-19-2006, 09:36 AM
This must be a guy thing. Take a nice K12 engine and jam it into a bike with 20 year old technology...next thing you'll need is a new brake system to stop the 20 year old bike with the new engine.Then you'll notice the K100 isn't as aerodynamic as it could be with the nice new engine....so you'll be looking for the body panels off a K12RS. But they won't really fit the frame right...
I can always ride my K1200R for that shot of new technology...
CustomSarge
05-22-2006, 09:50 PM
Why? just to see if you CAN, there's the fun! <<<)))
michaelcurrin
02-07-2009, 08:33 AM
PFLS,

If you're the same guy that had the article in the ON, please contact me, either here or a PM, I have a couple questions.

Thanks

Mike Currin

I had an article in ON a while back
http://hpsidecars.com/Projects/MikeCurrin/A%20Little%20More%20on%20the%20Side1.pdf
barryg
02-07-2009, 12:17 PM
Typical American guy thing. Guy has a '69 Camaro with a lame 350ci mouse motor. Gets to thinkin, U know a 427ci big block rat motor would go in there just fine. No replacement for displacement. Bigger is better. Yea baby. It's a testosterone thing. :brow :groovy
barryg
02-07-2009, 12:20 PM
Then again I'm fixxin to spruce up my old Vespa, I here they've become chick magnets. :kiss
bmwmick
02-07-2009, 12:49 PM
[QUOTE=michaelcurrin;419591]PFLS,

If you're the same guy that had the article in the ON, please contact me, either here or a PM, I have a couple questions.

Thanks

Mike Currin

Mike,
Yes, it's the same Paul. :) Send me your Email and I'll pass it on.
58058D
02-07-2009, 01:03 PM
I understand the urge for more power, etc, otherwise would not have hotted up my K12 motor....but I have to agree with Gail on this one (Rinty, too) brakes, suspension, tires.....hmmm nearly double the hp/torque onto those non radial 'skinny' tires with the non-paralever, old forks, etc....but it would be fun to see if it could be done. My friend's old '63 vette with a blown 427 was really really fast down the drag strip, sort of hard to drive around town and not real good on any type of twisty road...
rinty
02-07-2009, 01:34 PM
...not real good...58058

Here's another conversion, for everyone's (well, maybe not everyone :D) reading enjoyment:

http://www.pistonheads.com/porsche/default.asp?storyId=7895

and:

http://www.geocities.com/bustacasey/rearlidup.jpg
bmwmick
02-07-2009, 02:20 PM
Rinty,
Most excellent story at Pistonheads!!

Thanks
lostboy
02-07-2009, 09:18 PM
Why do this? The K1200RS is slow steering, terribly heavy, uncomfortable, has a mediocre gearbox and is a nuisance to service, but the motor is wonderful. The K100 is easy to service and a lot lighter. The only real drawbacks I can see are that the 1200 motor probably vibrates a bit more, and an unfaired motorcycle with that kind of speed is literally a pain in the neck.

I have an 1100 motor in my K1 and often think of making it a 1200. But since the 1100 motor has only 100,000 miles on it, I'll have to wait a bit.
michaelcurrin
02-12-2009, 02:12 PM
[QUOTE=michaelcurrin;419591]PFLS,

If you're the same guy that had the article in the ON, please contact me, either here or a PM, I have a couple questions.

Thanks

Mike Currin

Mike,
Yes, it's the same Paul. :) Send me your Email and I'll pass it on.

Thanks for the offer, I got up with him
rinty
02-12-2009, 02:50 PM
Yes, its the same Paul...PFLS

Paul:

I just read your article in the February News, and must commend you on a very clever conversion. You and your friend cracked some tough engineering problems.

And the bike has a nice, integrated, look to it, too.

This was one of the best articles I've read in the News for a long time.