BMW K bikes (Bricks)


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1Back to top Go down   How much do you trust your k-motor? Empty How much do you trust your k-motor? Sat Dec 15, 2018 4:12 pm

73MOH

73MOH
Silver member
Silver member


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Paul 
1986 K100 RS
1997 K1100LT
2005 KTM990sd
    

BobT

BobT
Life time member
Life time member
My 100 hp Rotax 912s in my flying machine weighed in at 67 kg. I doubt if the 90 hp K100 engine can get down to 100 kg, and it was not designed to run all day at max revs like the Rotax is.

    

duck

duck
Life time member
Life time member
A bit heavy for what they put out.  

They may not be specifically designed to run all day at high RPMs but they certainly will.  Without a 6th gear it's the only way to make good speed. 

The interstate speed limit in Montana is 80 MPH which means you can do 89 (143 kph) all day without getting a ticket. That's a hair above 6,000 RPM on a K75.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Complete K1100RS engine, sans gear reduction for aircraft, radiator & coolant, ignition module & computer, but with injection components, coils & engine loom, on my precision German-made bathroom scale. The ultralight engine shown doesn't appear to be using an alternator or traditional starter, the propeller likely being the method of starting. (158.1 lbs)
How much do you trust your k-motor? 20181210
How much do you trust your k-motor? 20181211



Last edited by Two Wheels Better on Sat Dec 15, 2018 7:08 pm; edited 1 time in total


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History is a vast early warning system ~Norman Cousins - Political Journo, Editor, Author & World Peace Advocate, 1915 - 1990 - Wikipedia
1977 R75/7-100, '93 K11/K12 Big Block, '93 K1100RS, '95 R100 Mystic, '96 K1100RS, 2 x '98 K1200RS, '06 K1200R & '09 K1300GT. Projects: 1993 & '96 K1100RS, & the 2nd '98 K1200RS
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
Don't know if it's an urban legend, but I've heard that K engines were designed to run 24 hours at red line. 

I've run my K75RT for 14 hour days at 6000+ rpm stopping only for gas.  Have done 100mph+ for well over an hour at a time in Colorado/Kansas and up in Manitoba/Saskatchewan.  Even with 94,000 miles on the clock I have no hesitation to open up my K75 in desolate places far from home.  Heck, isn't that what they were built for?


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Present: 1991 K100RS "Moby Brick Too"
 
Past:
1994 K75RT "Ilsa, She Wolf of the SS"
1988 K100RS SE "Special Ed"
1994 K75S "Cheetos"
1992 K100RS "Moby Brick" R.I.P.
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

Rick G

Rick G
admin
admin
BobT wrote:My 100 hp Rotax 912s in my flying machine weighed in at 67 kg. I doubt if the 90 hp K100 engine can get down to 100 kg, and it was not designed to run all day at max revs like the Rotax is.
How much do you trust your k-motor? Image210


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 1999 K1100 LT with a Big Block 1200
    

td5

td5
Platinum member
Platinum member
Well they did start out making aero engines:D


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How much do you trust your k-motor? K_engi10
1988 / K100RS
2013 / R1200GS
2015 / K1300R
2002 / R1100S BCR
    

Dai

Dai
Life time member
Life time member
Somewhere in the Walker and Dobson book is the statement that the K100 engine was designed and built to take twice the bhp than it actually puts out.


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

BobT

BobT
Life time member
Life time member
Complete K1100RS engine, sans gear reduction for aircraft, radiator & coolant, ignition module & computer, but with injection components, coils & engine loom, on my precision German-made bathroom scale. The ultralight engine shown doesn't appear to be using an alternator or traditional starter, the propeller likely being the method of starting. (158.1 lbs)

The Rotax 912S does have a starter, and a reduction gearbox and a alternator. And 67 kgs is with coolant and oil. Starting with a propeller is something that was done in the 1950s.

If the K engine could shed around 40 kgs then it would probably be a contender, but as it is people go for the 912s for a reason.
 My whole aircraft including engine weighed less than a K1100LT.

    

norton71

norton71
Silver member
Silver member
Had a mate with a Tiger Moth and swinging the prop was the only way to go for starting...had low compression on one cylinder as you turned the prop through it's rotation prior to starting and it would be hard to pull through 3 cylinders and then would just flop through the 4th; so we did an easy valve grind on an upside down donk..would have cost him heaps to fly an engineer up to do it, but it was an easy fix with a slow speed drill and some valve grinding paste. Shocked K donk would have been nicer if you have ever been in a Tiger Moth.

    

duck

duck
Life time member
Life time member
Ten posts in and no "Flying Brick" comments?  Rolling Eyes


__________________________________________________
Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
98 Taxi Cab K1200RS
14 K1600GT
http://www.ClassicKBikes.com
    

12Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? Sun Dec 16, 2018 10:11 pm

Dai

Dai
Life time member
Life time member
Well, you just made one? Razz


__________________________________________________
1983 K100 naked upgraded to K100LT spec after spending time as an RS and an RT
1987 K100RT
Others...
1978 Moto Guzzi 850-T3, 1979 Moto Guzzi 850-T3 California,1993 Moto Guzzi 1100ie California
2020 Royal Enfield Bullet 500
    

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