BMW K bikes (Bricks)

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David Nimrod

David Nimrod
Silver member
Silver member
Link to Post on UKGSER.

NOT ME - JUST THOUGHT IT MAY BE OF INTEREST

'After two years of riding my K100 turbo, problems started to occur, namely due to more boost and harder use!
I discovered 2 spark plugs were wet and black, further investigation revealed the top rings on 2 pistons had cracked.
I needed to fit 4 new forged pistons with lower compression ratios and better quality rings but this would inevitably
mean the bike got used harder, already it was proving far to easy to exceed the speed limits, a few occasions had
seen 250kph on the speedometer, in France that's lose your licence and your bike time.
I decided to remove the turbo and, because I'd disposed of the injection system, to convert the bike to carbs.
Half the reason was to keep everything really simple, the other half because it was an interesting project.
Four carbs would be the best set-up, but to keep it really simple, I decided to use a single carb and a log-type inlet
manifold.
Yes, getting an even mixture balance between the cylinders would be harder plus I'd lose a few bhp at the top-end,
but this is a road bike not for competition use.
I decided to use a 32mm Bing, purely because I had a spare one along with a lot of Bing jets, etc.
There is no fuel pump, just an inline fuel tap.
I ended up having to make three inlet manifolds to find an acceptable diameter for the main 'log', plus on the final
version, vary the inside diameters of the stubs for cylinders 1 and 4 to balance the mixture distribution between the
inner and outer cylinders.
Finally, everything is finished and working really well. The bike starts instantly hot or cold and acceleration is
seamless. It's returning a constant 46-48mpg per tankful which is acceptable.
I've left the 'soft' cams fitted to the turbo engine in place, with those, (it's the 16V engine), it will drop to 25mph in
5th gear and accelerate cleanly without changing down, the engine is incredibly torquey.
The acceleration at higher rpm is still really good, I don't know how it would compare to an injected system with
'soft' cams as I've never seen one.
It's been an interesting project and I'm pleased with the outcome'



Last edited by David Nimrod on Sun Oct 09, 2016 8:56 am; edited 1 time in total


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What I'm out for is a good time
All the rest is Propaganda! BMW K100 with single 32mm Bing carburettor. 112350
    

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
mmmmmmm

Why would you?

Because it can be done. this one is done nicely.


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

Snod Blatter

Snod Blatter
Life time member
Life time member
Given the way classic Mini owners bolt K100 heads to their A series blocks (after a lot of work..) I'm surprised there aren't more readily available inlet manifolds like this. I'd be tempted if there were!


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1989 K100RS SE ABS 8v  VIN: 0149214
Others: 1.5 x Honda CBX250RS-E, '94 CB250, '95 TRX850, '16 Z250SL
http://justbikethings.blogspot.co.uk/
    

AL-58

AL-58
Life time member
Life time member
@Snod Blatter wrote:Given the way classic Mini owners bolt K100 heads to their A series blocks (after a lot of work..) I'm surprised there aren't more readily available inlet manifolds like this. I'd be tempted if there were!
The people doing those conversions keep the Fuel Injection as they are actually chasing the hp.

Al


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'87 K100RS/HRD sidecar (1100 motor)  sc25 
'92 K100RS-16v (Paint it Black)

'87 K100RT with Paralever backend

"When I'm too old and too foolish to handle a sidecar I'll buy a Sportsbike"

BMW K100 with single 32mm Bing carburettor. K-dogs10
    

92KK 84WW Olaf

92KK 84WW Olaf
Life time member
Life time member
There's your answer. It has been staring us all the time.....

Recycle the mini intake manifolds. Complete with Solex or whatever carb they used.........


__________________________________________________
1992 K100LT 0193214 Bertha Alaska Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 58,645 now 100,380 miles
1983 K100RS 0011171 Fricka 29,495 miles Damn K Pox Its a Bat outta Hell No 33,600 miles
    

indian036

indian036
Life time member
Life time member
@92KK 84WW Olaf wrote:There's your answer. It has been staring us all the time.....

Recycle the mini intake manifolds. Complete with Solex or whatever carb they used.........
Australian minis used SU, single 1 1/4" for ordinary, twin for Cooper and Cooper S. Or mine had twin 1 1/2"!
Sounds like a plan. Olaf.  Wink

Bill


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1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

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