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1Back to top Go down   85 or "European" cams Empty 85 or "European" cams on Mon Nov 19, 2012 10:01 am

Dewey V

Dewey V
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Are the 1985 cams or the "European" cams truly different than other K100 cams? If so, can anyone furnish actual numbers such as lift, duration, timing? Are they a different part number?

    

2Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Mon Nov 19, 2012 12:25 pm

charlie99

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i believe the california and possibly the swiss cams may be different, from posts in here .

there were lots of aftermarket products (now scarce ) available .

you might try using the "search" feature dewey

i seem to recall a post about the cam durations a little while ago ,,,

240 degrees from .050 lift was pretty standard (265 deg ?) for most high performance twin cams of the era, no point in going much further for "on road rideability "

i guess the theory was more bangs per rear wheel revs produced good torque from 3k up ...and all those engines reved so well, including our mighty " k "

found this, but doesnt answer the question about differences though

http://k100rt.aforumfree.com/t3568-modifying-the-cam-timing


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'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O85 or "European" cams Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

3Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Mon Nov 19, 2012 3:08 pm

nino

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Friend of mine drove K 1986 engine for swiss market with RPM limit at 6500. Even the red line mark on instrument was at 6500. To get full RPMs and power he changed black box (probably fuel injection controller) under the tank and engine started rev full range to 8600 RPM. Anybody knows for shure was it the only difference between swiss K and european K? Maybe camshafts?

Regards

    

4Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Mon Nov 19, 2012 4:37 pm

Crazy Frog

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I believe the only difference on the cams were between the 85 and 86 model. The 85 has 10 more HP.

The Swiss version had a rev limiter. They used the original rev limiter bulit into the fuel injection computer, but changed the setting to cut the injection at 6,500 rpm.


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85 or "European" cams Frog1585 or "European" cams Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

5Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Wed Nov 21, 2012 6:10 pm

Dewey V

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Well, I think that I have found the definitive answer to this question and that is this:

According to specs from a German, UK and US factory service manual and cross-checked with the Haynes manual and BMW part numbers, ALL K100 2V cams are the same EXCEPT for California bikes. It seems that the difference is that worldwide and 49-state bikes got cams with 284 degrees duration and CA bikes got cams with 256 degrees duration. BMW lists the standard cams and CA cams.
The advertised horsepower for ALL year 2V K100 engines is 90. It appears that the myth of the 85 cams or the "European" cams being "hotter" is just a myth.



Last edited by Dewey V on Thu Nov 22, 2012 6:46 pm; edited 1 time in total

    

6Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Thu Nov 22, 2012 12:00 pm

Rjtrucker

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I have a set of 85 cams here if you want to compare.


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Ron S
NJ USA
74 R90/6 cafe project
93 K11LT
85 K100RS
85 K100RS turbo project.
And a load of K100 projects and parts.
    

7Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Thu Nov 22, 2012 7:27 pm

Dewey V

Dewey V
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@Rjtrucker wrote:I have a set of 85 cams here if you want to compare.

PM'd you.

    

8Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Thu Nov 22, 2012 7:59 pm

Inge K.

Inge K.
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Have a look at post #10 , about the same subject.


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

9Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Thu Nov 22, 2012 9:33 pm

Dewey V

Dewey V
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@Inge K. wrote:Have a look at post #10 , about the same subject.

If that is the case then ALL US 2V bikes have "California" cams, correct?

    

10Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Thu Nov 22, 2012 9:44 pm

Crazy Frog

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@Dewey V wrote:If that is the case then ALL US 2V bikes have "California" cams, correct?
I think this statement is correct, but in Canada we have a lot of K100 European style.
Checking your VIN # on this site should tell you if you have a US or EU model.

CF


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85 or "European" cams Frog1585 or "European" cams Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

11Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Fri Nov 23, 2012 11:59 am

GWK11RS

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Hi Guys, I'm new here but I have done a lot of research on this subject , and found most of my informations on cams on the vintage mini cooper web sites(these guys use K100 2an4 valve and K11and12 heads on there mini's to get more power out of them). As far as I could determine in 85 the European and 49 state bikes had the hotter cams(284 duration and higher lift) in 86 all U.S. bikes received the smaller cams that the California bikes have, I think because of tightening emission controls in the U.S. The K100 4v suffered the same fate with the Euro bikes getting the hotter cams and the U.S. getting the smaller cams. The K1100 all received the smaller cams do to a 100 hp limit Europe, the K12 RS and GT all have the hot cams and biggest throttle bodies(38mm). I installed the hotter cams and throttle bodies and fuel rail(3.5 bar regulator instead of 2.5 on earlier bikes) from a K12RS on my 96 K11RS along with a Ramus exhaust and a tweak to the motronic 2.2 and the the power difference put a real big permanent grin on my face. The engine revs up so fast in 1st and 2nd gear that the engine beats the tach to the rev limiter.

    

12Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Fri Nov 23, 2012 12:58 pm

Comberjohn

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Interesting thread.
Any info on pre 85 cams? Are the earlier ones different again?
My 84 K100 feels perkier than my 89 one did, but then imagination is a wonderful thing.
Maybe it's just a 'tighter' engine.

http://www.johnsdrivingschool.co
    

13Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Fri Nov 23, 2012 4:20 pm

Dewey V

Dewey V
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@GWK11RS wrote:Hi Guys, I'm new here but I have done a lot of research on this subject , and found most of my informations on cams on the vintage mini cooper web sites(these guys use K100 2an4 valve and K11and12 heads on there mini's to get more power out of them). As far as I could determine in 85 the European and 49 state bikes had the hotter cams(284 duration and higher lift) in 86 all U.S. bikes received the smaller cams that the California bikes have, I think because of tightening emission controls in the U.S. The K100 4v suffered the same fate with the Euro bikes getting the hotter cams and the U.S. getting the smaller cams. The K1100 all received the smaller cams do to a 100 hp limit Europe, the K12 RS and GT all have the hot cams and biggest throttle bodies(38mm). I installed the hotter cams and throttle bodies and fuel rail(3.5 bar regulator instead of 2.5 on earlier bikes) from a K12RS on my 96 K11RS along with a Ramus exhaust and a tweak to the motronic 2.2 and the the power difference put a real big permanent grin on my face. The engine revs up so fast in 1st and 2nd gear that the engine beats the tach to the rev limiter.

Thanks for the info. I guess I didn't have it figured after all.

    

14Back to top Go down   85 or "European" cams Empty Re: 85 or "European" cams on Mon Nov 26, 2012 1:30 pm

Themason

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BMW sold a few K100 and K100RSs in the US in late 1984 as early release 1985 models. They were 49 state only bikes not legal for sale in California. They had the US required lights and reflectors, but were otherwise pure Euro-spec machines with no evaporative emissions equipment, the push button style gas cap with a big wide easy to use opening and no flap to fight, and most importantly the same 284 degree cams sold on K100s everywhere else in the world (except maybe Switzerland, but I don't know enough yet to say yea or nay).

Around April of 1985 BMW began selling a 50 state legal bike in the US (note: there was never a "California" model as such). These came with 256 degree cams, costing 7 horses and taking away some of the original top end rush. They also had a miserable gas cap with a narrow opening and a flap supposedly to minimize evaporative emissions. They also vented the gas tank into the engine through a check valve so you couldn't (supposedly) send raw gas into the crank case) and to prevent crank case pressure from pressurizing the tank. It could suck fumes from the tank but not blow back into the tank. Says right here in fine print!

Today, if you want to buy replacement cams from BMW for the K100, 284 degree cams is all they offer.

Correct on the K100 16V and K1100 cams. I have oft wondered what a K1100 with Euro spec K100 16V cams would be like. Now I have an idea. Helluva bike I bet.


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1984 K-100RS Alaska Blue w/Parelever and 16V wheels.

1984 K-100RS Metallic Madison stock

1986 R-80G/S w/1000 cc engine

2007 Harley Davidson Street Rod Mirage Orange w/XR1200 wheels, Race Tech, True Track, Works Performance shocks

2007 Harley Davidson Street Rod Vivid Black stock

1993-ish K-100/1100RT/LT hemaphrodite frankenbike thingy to be painted satin black from a rattle can eventually
    

15Back to top Go down   85 or "European" cams Empty High cams and a classic on Fri Sep 13, 2013 6:48 am

Ajays

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This says it all...!


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85 or "European" cams Th_Kengine_gif

AJAYS
    

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