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1Back to top Go down   BMW K100RS, did they get the 100hp motor? Empty BMW K100RS, did they get the 100hp motor? on Sat Sep 12, 2015 3:13 pm

RC2

RC2
New member
New member
I sold my R65, now I'm in the market for a K100RS.
Did the K100RS models get the 100hp motor?  Or that's only on the European K100 models? 
I read somewhere that the European K100 had a different cam?  I know the K1100 motors have 100hp.

    

Crazy Frog

Crazy Frog
admin
admin
NOPE!

The most powerful version is "only" 90HP, but the torque largely compensate for the lack of HPs.
I don't know a lot of bikes where you can ride at 60kmh in 5 gears, open the throttle to full and get a kick in the butt because the engine is pulling like an ox.
I know a lot of riders who got the latest BMW models with a lot of HP, but all of them say that they miss the character of the K100.


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BMW K100RS, did they get the 100hp motor? Frog15BMW K100RS, did they get the 100hp motor? Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

Inge K.

Inge K.
VIP
VIP
K100RS16V have 100hp.


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Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

Two Wheels Better

Two Wheels Better
Moderator
Moderator
+1 with Inge on K100 16V.

There is a persistent story that the '83 - '85 K100 (8V), both US & Euro models, had different cam profiles which purportedly gave additional horsepower as compared to the later 8V. However, it is unsubstantiated.


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"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

Arthur Conan Doyle
1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - all of the Beemers in my life I can recall, owned still or sold on.
    

Motorbike Mike

Motorbike Mike
Life time member
Life time member
@Two Wheels Better wrote:+1 with Inge on K100 16V.

There is a persistent story that the '83 - '85 K100 (8V), both US & Euro models, had different cam profiles which purportedly gave additional horsepower as compared to the later 8V. However, it is unsubstantiated.
Well, I've not long since taken ownership of a 3700 mile 8v K100 Basic, Naked, call it what you will.

BMW K100RS, did they get the 100hp motor? Cimg2815

It's an absolute rocket ship! Smooth and quite powerful. Even with two of us on the bike it has so much torque and the goes again at 5000 rpm. It actually frightens me a little as the engine far out performs the chassis with it's soft forks and crap brakes. You could easily get into trouble aboard the Brick.....but I love it!
I've got a new R1200RS and this morning we went out for breakfast, I took the K100 again. Laughing

    

RicK G

RicK G
VIP
VIP
@Two Wheels Better wrote:+1 with Inge on K100 16V.

There is a persistent story that the '83 - '85 K100 (8V), both US & Euro models, had different cam profiles which purportedly gave additional horsepower as compared to the later 8V. However, it is unsubstantiated.
I have seen quoted in Clymers (it may have been Haynes but unlikely) that the "Californian" models were equiped with inlet cams that opened the valve 10° ATDC as against the European models it was 10° BTDC.  This effectivly lowers the compression ratio because there is less charge to compress and that in turn lowers combustion chamber temperature which produces less of the evil oxides of nitrogen to poison the atmosphere.
Don't blame me if Clymers have it wrong.


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

Two Wheels Better

Two Wheels Better
Moderator
Moderator
That surely doesn't sound like hotter cams/more power!

I have a BMW Parts Snab book (pre-ETK) from the era at work and the part numbers even then were the same for all models. Perhaps it was a short-lived thing they did!?

I recall reading an article wherein the author pokes fun at the idea of creating a rumour around the hotter cams issue and said he made it up at the time, it stuck and he was surprised.


__________________________________________________

"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

Arthur Conan Doyle
1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - all of the Beemers in my life I can recall, owned still or sold on.
    

RicK G

RicK G
VIP
VIP
The overall performance would be little different between the two. The retarded opening of the inlet will lower the bottom end torque but will make more HP in the top end however that benefit would probably be negated by the small drop off in compression.  I would say that a drop of 3 to 5 HP would be the overall result but taking something like a 1/4 mile time and terminal speed the engine with the "Hotter Cams" would have a slight advantage and by slight I mean about 1/10 second if that


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

Two Wheels Better

Two Wheels Better
Moderator
Moderator
Here 'tis

Read the 7th post in this link


__________________________________________________

"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

Arthur Conan Doyle
1970 R60/5, '77 R75/7-R100, '85 K100'87 K75C, '87 K100RS, '93 K11-K12 Big Block, '93 K1100RS, '95 R100-Mystic, '96 K1100RS, '98 K1200RS, '00 K1200RS, '02 K1200RS, '03 K1200GT, '04 R1150R'04 R1150RT, '05 K1200S, '06 K1200R, '07 K1200R, '09 K1300GT & 2013 R1200RT-Polizei  - all of the Beemers in my life I can recall, owned still or sold on.
    

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