BMW K bikes (Bricks)

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1Back to top Go down   Just thinking... Empty Just thinking... on Tue Nov 17, 2020 2:53 am

chris846

chris846
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For some reason, I've ended up pondering whether the K75 & K100 Fi modules could be interchangeable  bounce.

I'm thinking that fitting a K75 module onto a K100 would increase the fuel delivery by 33%.....ish, very ish  scratch


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Sometimes I'm not really Suzi Quatro.
    

2Back to top Go down   Just thinking... Empty Thinking on Tue Nov 17, 2020 3:32 am

daveyson

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And LP records turned at 33rpm ...ish.

Coincidence?

To remember your very very interesting link, I'm filing in my ethics folder, after my latest entry "Never date a woman who doesn't respect your wife"


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

3Back to top Go down   Just thinking... Empty Re: Just thinking... on Tue Nov 17, 2020 3:52 am

chris846

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"And LP records turned at 33rpm ...ish.
Coincidence?"

I arrive outside my front door, my dog is on the inside, he sees me, he wags his tail.
I knock on the door, he sees me knock, he barks because the knock tells him a stranger has arrived.
His learning is based on links he has made, he is hungry for links, we are hungry for links, all learning is links. What separates the dog from us is that he has no need and hence no ability to rationalise, and this prevents his further learning.

What you are doing is good, very good, but you need to rationalise a bit  Laughing


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Sometimes I'm not really Suzi Quatro.
    

4Back to top Go down   Just thinking... Empty Re: Just thinking... on Tue Nov 17, 2020 4:15 am

chris846

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No.

Just thinking... Lenny_10  "Y'see George, if ya connect a K75 FI module to the AFM on a K100 doin' three thousand rpm, surely it's gonna think it's on a K75 doin' four thousand rpm an' it'll just bank fire the injectors the same!"




Just thinking... Lenny_11


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Sometimes I'm not really Suzi Quatro.
    

5Back to top Go down   Just thinking... Empty Thinking on Tue Nov 17, 2020 4:43 am

daveyson

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Are you going to try it? I first thought it was a joke.


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

6Back to top Go down   Just thinking... Empty Re: Just thinking... on Tue Nov 17, 2020 10:49 am

Point-Seven-five

Point-Seven-five
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I'm not sure, but I think the difference that may cause problems is that the K75 has three coils, one for each cylinder, while the K100 has two coils with each one firing two cylinders. Ignition sync signals are probably different between models. Also, see the Hall Sensor Plates are different, so timing pulses may be incorrect.


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Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

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
    

7Back to top Go down   Just thinking... Empty Re: Just thinking... on Tue Nov 17, 2020 10:54 am

92KK 84WW Olaf

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Might it confuse 4 and 3 and sound like a V12?


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles.
    

8Back to top Go down   Just thinking... Empty Re: Just thinking... on Tue Nov 17, 2020 11:01 am

Laitch

Laitch
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@chris846 wrote: we are hungry for links, . . . 
A Lorne sausage in a buttery roll is just as satisfying; furthermore, you can use it to train your dog when to bark and at what.


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1995 K75 81,000 miles
Just thinking... Usa-lo10
    

9Back to top Go down   Just thinking... Empty Re: Just thinking... on Tue Nov 17, 2020 11:06 am

chris846

chris846
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Hey if it sounds like a V12, that's a result in my book!

I think the Fi module on the LE Jetronic gets a firing signal from the ignition module, and somewhere in the dim and distant I sort of think this is once per revolution - the Jetronic bank fires on the exhaust stroke as well as the firing stroke.
How this works out with a 120' 3 cylinder I dunno. There's only 2 hall sensors on the '75, so I'd guess that the ignition module sends a firing signal to the FI module once per revolution just the same?

There's only one way to find out...


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Sometimes I'm not really Suzi Quatro.
    

10Back to top Go down   Just thinking... Empty Thinking on Tue Nov 17, 2020 11:16 am

daveyson

daveyson
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Yep I'm thinking that too. It seems such a waste to have a wasted spark when you have three cylinders and three coils.


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11/1985 bmw k100rt (late model)  Vin. 0090567
    

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