BMW K bikes (Bricks)

You are not connected. Please login or register

View previous topic View next topic Go down  Message [Page 1 of 1]


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

73MOH

73MOH
Silver member
Silver member


__________________________________________________
Paul
1986 K100 RS
1997 K1100LT
2005 KTM990sd
    

2Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sat Dec 15, 2018 6:23 pm

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.

    

3Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sat Dec 15, 2018 6:37 pm

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.


__________________________________________________
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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

4Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sat Dec 15, 2018 6:58 pm

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


__________________________________________________

1987 K100RS, '89 K100 w/K1100RS engine, '93 Framed K11/K12 engine 'Big Block', '96 K1100RS, '09 K1300GT, '07 K1200R, '95 R100 Mystic & '77 R75/7.

    

5Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sat Dec 15, 2018 7:06 pm

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?


__________________________________________________
Present:
1994 K75RT
1991 K100RS

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

6Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sat Dec 15, 2018 8:09 pm

RicK G

RicK G
VIP
VIP
@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


__________________________________________________
"Every normal man must be tempted, at times, to spit upon his hands, hoist the black flag, and begin slitting throats." from Mencken's 1919 Prejudices

Bikes 1993 K1100 LT, 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 for now
    

7Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sat Dec 15, 2018 11:46 pm

td5

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


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

8Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sun Dec 16, 2018 7:50 am

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.


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

9Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sun Dec 16, 2018 8:36 am

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.

    

11Back to top Go down   How much do you trust your k-motor? Empty Re: How much do you trust your k-motor? on Sun Dec 16, 2018 8:37 pm

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 (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
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? on Sun Dec 16, 2018 10:11 pm

Dai

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


__________________________________________________
'83 K100 upgraded to K100RS spec
Others...
'78 Moto Guzzi 850-T3, '79 Moto Guzzi 850-T3 California,'93 Moto Guzzi 1100ie California,
'03 Suzuki Blandit GSF600SK3 (NFS any more because wifey has claimed it)
    

View previous topic View next topic Back to top  Message [Page 1 of 1]

Permissions in this forum:
You cannot reply to topics in this forum