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1Back to top Go down   K100 4v airbox removal Empty K100 4v airbox removal on Thu Jan 26, 2017 5:43 am

andyldean

andyldean
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K100 4v airbox removal 20170110




Keen  to ditch the airbox on my k1004v.

manufactured manifolds and brackets etc and the bike is staring to run "well"

plenty of vacum pipes etc still left free, hass anyone anyone completed this conversion before? and can you give me a little guidance to help out?

This is my second k100 my other is a 2v which I use daily.

Thanks in advance.


__________________________________________________
1987 K100RT (cafe racer)
1991 K100RS (soon to be my sons cafe racer)
    

2Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Thu Jan 26, 2017 10:25 am

Motorbike Mike

Motorbike Mike
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On my 4 valve track bike both of my crankcase vents go into a breather bottle. It runs just fine and ticks over without any problems.
There's not that much to take care of when you look at what's left after removing the airbox.

K100 4v airbox removal Brick11

    

3Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Fri Jan 27, 2017 5:03 am

andyldean

andyldean
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K100 4v airbox removal 20170111


On closer inspection the pipe in my hand is a breather so that should be easily sorted the other one running off the back of the inlet manifold is not so easy.

Could I just block this one off?
I am also struggling to find a workshop manual for the 4v. Is it to be found in the downloads? I cant find it thats all.
Thanks in advance :-)


__________________________________________________
1987 K100RT (cafe racer)
1991 K100RS (soon to be my sons cafe racer)
    

4Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Fri Jan 27, 2017 8:27 am

Motorbike Mike

Motorbike Mike
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@andyldean wrote:K100 4v airbox removal 20170111


On closer inspection the pipe in my hand is a breather so that should be easily sorted the other one running off the back of the inlet manifold is not so easy.

Could I just block this one off?
I am also struggling to find a workshop manual for the 4v. Is it to be found in the downloads? I cant find it thats all.
Thanks in advance :-)
I'm sure that different countries have slightly different spec bikes because I'm positive that my 16v bike didn't have that breather. I'd block it off and see how the bike runs-you've nothing to loose.

    

5Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Fri Jan 27, 2017 9:48 am

Laitch

Laitch
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@andyldean wrote:I am also struggling to find a workshop manual for the 4v. Is it to be found in the downloads? I cant find it thats all.
You can find a scruffy pdf here.


__________________________________________________
1995 K75T 73,000 miles
K100 4v airbox removal Usa-lo10
    

6Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Fri Jan 27, 2017 1:00 pm

BobT

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@Laitch wrote:
@andyldean wrote:I am also struggling to find a workshop manual for the 4v. Is it to be found in the downloads? I cant find it thats all.
You can find a scruffy pdf here.
I have the K1100 manual on a .pdf on my tablet, the early 1100 is almost identical to the16v K100.

    

7Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Fri Jan 27, 2017 1:20 pm

walfish

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Assuming this is what you may be looking for see link below.

http://www.k11og.org/forum/viewtopic.php?t=11285&highlight=cyclonic

I haven't yet but will do this conversion when I rebuild the bike, my 1100 is in bits with a gearbox problem and a little bit of a tart up.
There are 2 schematics, it is the 2nd one down.


K100 4v airbox removal 22936


__________________________________________________
K100 4v airbox removal Uk-log1088 K100 Unfaired 0033026 
   
92 K1100RT  6455097
    

8Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Sun Jan 29, 2017 4:08 am

Kafflut

Kafflut
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@Motorbike Mike wrote:On my 4 valve track bike both of my crankcase vents go into a breather bottle. It runs just fine and ticks over without any problems.
There's not that much to take care of when you look at what's left after removing the airbox.

Mike, what's a "breather bottle"?

I'd love to get rid of the air box on my 2 valve K, but I think it's not possible - One would have to somehow route the air via the AFM.

http://bmwk100k75.weebly.com/
    

9Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Sun Jan 29, 2017 10:57 am

Motorbike Mike

Motorbike Mike
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Sometimes called a catch tank, it's a container that all overflows and breathers must deposit into on race bikes as a bike pumping oil/fuel/water out onto a race track would be obviously disastrous.

This kind of thing below although I made my own but as I'm away at the moment I can't show you mine.

K100 4v airbox removal S-l500

    

10Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Sun Jan 29, 2017 12:35 pm

BobT

BobT
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@Motorbike Mike wrote:Sometimes called a catch tank, it's a container that all overflows and breathers must deposit into on race bikes as a bike pumping oil/fuel/water out onto a race track would be obviously disastrous.

This kind of thing below although I made my own but as I'm away at the moment I can't show you mine.

K100 4v airbox removal S-l500
Great information there I never realised that there was such a thing. I feel another baby feeding bottle is needed, just like the one that I use for my coolant overflow. 
I am not sure that I want to do away with the airbox yet. The pictures that I have seen of the four K&n type filters looks like a dogs dinner to me.

    

11Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Sun Jan 29, 2017 2:22 pm

Motorbike Mike

Motorbike Mike
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@BobT wrote:
@Motorbike Mike wrote:Sometimes called a catch tank, it's a container that all overflows and breathers must deposit into on race bikes as a bike pumping oil/fuel/water out onto a race track would be obviously disastrous.

This kind of thing below although I made my own but as I'm away at the moment I can't show you mine.

K100 4v airbox removal S-l500
Great information there I never realised that there was such a thing. I feel another baby feeding bottle is needed, just like the one that I use for my coolant overflow. 
I am not sure that I want to do away with the airbox yet. The pictures that I have seen of the four K&n type filters looks like a dogs dinner to me.
I have agree with you Bob about the pod filters, I'm not keen on how they look either. 
I would also imagine that removing the airbox doesn't do the bike's performance any good, when did you last see a MotoGP bike with 4 K&N's on it?
I made a force fed airbox for my Cobas bike out of alloy sheet and flexible ducting. Does it work? I don't know but it looks better than 4 pods. 👍

    

12Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Tue Jan 31, 2017 4:42 am

andyldean

andyldean
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Ok blanked off all the pipes etc and now dont seem to have any air leaks.

But the motor dies when I rev it.

Certain its a fuel problem of some description and more than likely something to do with the original airbox removal.
Any ideas?


__________________________________________________
1987 K100RT (cafe racer)
1991 K100RS (soon to be my sons cafe racer)
    

13Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Tue Jan 31, 2017 5:13 am

Motorbike Mike

Motorbike Mike
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Have you blanked off all the vacuum pipe connections? Does the bike run with a little throttle? If so adjust the idle screw unit it ticks over. I had to make some small adjustments but your bike should run. Mine ticks over a treat on 1100 & 1200 TB's.
The motor will of course run differently because you've taken the velocity stacks off with the airbox. My force fed airbox uses the stacks-maybe that's the difference here. If you make a significant change to an intake system you're going to have a little experimentation on your hands.

    

14Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Tue Jan 31, 2017 5:32 am

BobT

BobT
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@andyldean wrote:Ok blanked off all the pipes etc and now dont seem to have any air leaks.

But the motor dies when I rev it.

Certain its a fuel problem of some description and more than likely something to do with the original airbox removal.
Any ideas?
Are you saying that you have blanked off the crankcase breathers? If you have then it is no wonder it dies when you rev it. Every engine needs to get rid of crankcase pressure somehow.

    

15Back to top Go down   K100 4v airbox removal Empty Rich running issues on Fri Jun 09, 2017 6:23 am

andyldean

andyldean
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Well its been a while since my initial post but still trying to get to the bottom of this.

I have been riding the bike for a few months now but its running very rich and fouls the plugs after a few weeks resulting in a missfire.

Finally got to the bottom of the rich running and its due to the absence of the air temp sensor. Embarassed

Ok so now I have dumped the airbox where do I position this sensor?

Just got it tied up near the old airbox position at the moment and immediately my plugs are a nice biscuit brown. Very Happy

Just interested in the best position in everyone elses experience.

Thanks in advance.


__________________________________________________
1987 K100RT (cafe racer)
1991 K100RS (soon to be my sons cafe racer)
    

16Back to top Go down   K100 4v airbox removal Empty Changes to intake system? on Sat Jul 22, 2017 1:59 am

Kafflut

Kafflut
Silver member
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@Motorbike Mike wrote:The motor will of course run differently because you've taken the velocity stacks off with the airbox. My force fed airbox uses the stacks-maybe that's the difference here. If you make a significant change to an intake system you're going to have a little experimentation on your hands.
My 4-cylinder car, 2007, has a single throttle body. Why does the K100 have four? It seems to me one can do away with synchronization problems if there was only one.

I recently made an "air flow" measuring jig & spent several hours adjusting the inter TB linkages (on the bench). Then fine tuned the TBs on the bike. My engine is running fine. I'm not about to rip out the four TBs and replace them with a single TB. I ask the question because I'm thinking if in the future I have to work on them, they become U/S, is a single TB not an option?

http://bmwk100k75.weebly.com/
    

17Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Sat Jul 22, 2017 3:20 am

k-rider

k-rider
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@Kafflut wrote:
@Motorbike Mike wrote:The motor will of course run differently because you've taken the velocity stacks off with the airbox. My force fed airbox uses the stacks-maybe that's the difference here. If you make a significant change to an intake system you're going to have a little experimentation on your hands.
My 4-cylinder car, 2007, has a single throttle body. Why does the K100 have four? It seems to me one can do away with synchronization problems if there was only one.

I recently made an "air flow" measuring jig & spent several hours adjusting the inter TB linkages (on the bench). Then fine tuned the TBs on the bike. My engine is running fine. I'm not about to rip out the four TBs and replace them with a single TB. I ask the question because I'm thinking if in the future I have to work on them, they become U/S, is a single TB not an option?
have a look at this 
http://www.sportaxmoto.com/bmw-k100-turbo-2014/4547079924

k-rider


18Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Sat Jul 22, 2017 3:39 am

charlie99

charlie99
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on a normaly aspirated motor there is a good deal of science in the induction length to the intake valves .
in the development phase they tune these lengths to optimise the characteristics of the motor ...longer intake length promote bettor torgue down lower in the rev band , likewise shorter length can optimise the top end .
there are quite a few thoughts and philosophies to port diameter and lengths involved , flow rates and all that stuff all related to resonance of the valve / cam action and volumetric flow during the induction cycle .

wouldnt it be optimal to mount the air temperature sensor inside one of the induction tubes ? probably near the opening , but along the path after any changes in the stack diameter ..so in a section of the stack that has parallel sides ?

just trying to help out
cheers


__________________________________________________
cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OK100 4v airbox removal Au-log10

"redframe" rs "bitsa"  with many contributions from the k100 community ,,with many thanks
    

19Back to top Go down   K100 4v airbox removal Empty Re: K100 4v airbox removal on Mon Jul 24, 2017 1:33 am

Kafflut

Kafflut
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Thanks for the information and link, Charlie & K-Rider

Very Happy If I was not convinced before I am now, my rig is running just fine as it is

http://bmwk100k75.weebly.com/
    

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