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51Back to top Go down    Re: 1 hole Vs 4 hole injectors on Fri Apr 01, 2016 9:00 am

charlie99


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about 3 bar mate (vacuum hose disconnected ---which gave it about 2.5 - 2.7 bar with vacuum pulsing at idle ) ...the spray pattern on these injectors seams to benefit the slight extra pressure

note I retracted the afm springing back to 1 click down from standard ,( could have left it at 2 clicks down in spring tension but felt that economy would suffer greatly ) ...and relocated the wiper to achieve 1.16 volts on closed throttle instead of the 1.68 or something that I read as static settings before I started on this particular afm . thats from memory .


which kinda comes into line with the link I found for somemeasured standards ...that could have been from a much younger and unmolested afm - bike

    

52Back to top Go down    Re: 1 hole Vs 4 hole injectors on Fri Apr 01, 2016 8:41 pm

K75cster

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The 208 showed it delivered 133cc/min @ 36.25psi and then 144cc/min at 43.something psi which was 2.5bar and 2.7bar that being basically equal to the 210 delivery so I had expected it to marry up the same.
I think to ensure economy when doing an upgrade the psi and delivery would dictate the ability to have a decent spray pattern yet also it then becomes part and parcel to have the AFM also tweaked in concert with the change in injector.
We would benefit from two tables in that case one with the injector and one with the readings of the AFM and the plug chop observations too I guess.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

53Back to top Go down    Re: 1 hole Vs 4 hole injectors on Fri Apr 01, 2016 9:49 pm

RicK G

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According to the info I have a 208 delivers 133cc/min at 44psi (3 bar) and a 210 delivers 133 at 36.5 psi. (2.5 bar)


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

54Back to top Go down    Re: 1 hole Vs 4 hole injectors on Sat Apr 02, 2016 5:21 am

K75cster

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I used the rc eng site and then foundfuelinjector.citymaker.com site and took it from there, its a bugger when they don't match, the site I read gave two values for the 208, one at 36psi and one at 43 and they were 133 and 144. OK so its a no show form that site.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

55Back to top Go down    Re: 1 hole Vs 4 hole injectors on Sat Apr 02, 2016 6:32 am

RicK G

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Recently all the makers got together and decided to quote Flow on injectors would be quoted at 3 bar so there is a trap there for the unwary. Not that this was the situation here but just thought I should throw it in.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

56Back to top Go down    Re: 1 hole Vs 4 hole injectors on Sun Apr 03, 2016 8:08 am

K75cster

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Rick I was wondering about the split spratinjector shown by the Kaptain earlier, why would that not be advantageous in passing the valve stem?? Especially if you can line up the spray to pass either side of that stem.


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Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

57Back to top Go down    Re: 1 hole Vs 4 hole injectors on Sun Apr 03, 2016 8:42 am

RicK G

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Disadvantage if anything, the valve head and stem rely on the fuel spray for some cooling.


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If everything seems under control then you aint goin fast enough:- Mario Andretti
Bikes 1986 K100RT, 1993 K1100 LT, 1994 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki X 2 & 1976 SR 500 Yamaha for now
    

58Back to top Go down    Re: 1 hole Vs 4 hole injectors on Wed Apr 06, 2016 7:25 pm

Holister

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Yep. In fact the #210 injector in the 2V K was specifically designed to squirt fuel to the back of the valve head and stem. Being the hottest part of the intake chamber it vapourises the liquid fuel very quickly. Keep in mind this was before they had developed injectors that atomised fuel.


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1988 K100RT VIN No. 0094680
1989 K100RT VIN No. 0097367 (naked)
1996 K1100RS VIN No. 0451808
Fuel: 95 Octane
Engine Oil:Nulon Full Synthetic 15W50
Gear Box Oil: Nulon Synthetic 75W90
    

59Back to top Go down    Re: 1 hole Vs 4 hole injectors on Thu Apr 07, 2016 1:16 am

rawdonball

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Interesting...

Another example of the benefits of understanding what the designers had in mind. Thanks guys


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'88 K100RT, '86 K75C, '05 Yamaha TTR250
    

60Back to top Go down    Re: 1 hole Vs 4 hole injectors on Fri Apr 08, 2016 1:50 am

K75cster

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@charlie99 wrote:about 3 bar mate (vacuum hose disconnected ---which gave it about 2.5 - 2.7 bar with vacuum pulsing at idle ) ...the spray pattern on these injectors seams to benefit the slight extra pressure

note I retracted the afm springing back to 1 click down from standard ,( could have left it at 2 clicks down in spring tension but felt that economy would suffer greatly ) ...and relocated the wiper to achieve 1.16 volts on closed throttle instead of the 1.68 or something that I read as static settings before I started on this particular afm . thats from memory .


which kinda comes into line with the link I found for somemeasured standards ...that could have been from a much younger and unmolested afm - bike

Got it thanks, but is this on the modified head and intake motor, you've been setting up or is it stock. I've had to go back to page 1 of your 85renno thread to find out if it was on a bike with a head job done to it, but cant tell.


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

61Back to top Go down    Re: 1 hole Vs 4 hole injectors on Sun Sep 18, 2016 1:04 pm

charlie99

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hi keith
it was to mymodified head ( ports cleaned up )


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%O
    

62Back to top Go down    Re: 1 hole Vs 4 hole injectors on Mon Sep 19, 2016 5:36 am

K75cster

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Good Job Charlie, I will file that away fro when I need it. taa mate


__________________________________________________
Keith - 1987 K75c with r100rt replica fairing and half of a 1984 K100rt

The Clever are adept at extricating themselves from situations that the wise would have avoided from the outset - QUOTE from david Hillel in Out of the Earth.
    

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