BMW K bikes (Bricks)

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1Back to top Go down   Vacuum modification Empty Vacuum modification on Fri Jul 12, 2019 10:51 pm

Porto

Porto
active member
active member
Some years ago a BMW specialist and good friend made a few modifications to my K100. This vacuum tube with condensation and load valve made a huge improvement. But he told me even just spreading the vacuum across all cylinders makes a big improvement.Vacuum modification E304b610Vacuum modification E304b610
[url=https://servimg.com/view/20091290/9]

    

2Back to top Go down   Vacuum modification Empty Re: Vacuum modification on Sat Jul 13, 2019 5:21 am

Woodie

Woodie
Life time member
Life time member
The photo cuts off part of the assembly on the left side.  Is it a condensation drain that is missing?  Interesting.


__________________________________________________
1985 K100RT
52667
"Keep your stick on the ice.  We're all in this together."  Red Green
    

3Back to top Go down   Vacuum modification Empty Re: Vacuum modification on Sat Jul 13, 2019 10:31 pm

Porto

Porto
active member
active member
The main body finnishess about another 10mm on the left just off screen. The filter collects the condensation and then delivers it back at higher RPM across all cylinders. The nut you see is a drain plug. These engines have a few problems related to difficulty in starting after long periods. I believe the condensation build up in line on original design when vacuum is on the rear cylinder only coupled with a low batterie will prevent the engine from coming to life. I tested the theory once after being of the road for a while. When I undid the nut some liquid ran out. The bike then started after that on a low batterie. You can pull the hose off the end cylinder on original set up for a low batterie start. It will fire with a poor idle and then you can pop it back on.
Another plus is the starting now, it comes to life instantly in any weather cold or hot motor. 
Spreading the vacuum across all cylinders and disconnecting the TPS is also an important upgrade. Trust me it will be smoother and more responsive than ever.
My old mate had a stroke last Xmas (big loss in his industries) I’m lucky I got to learn so much from him.
Cheers 
Porto

    

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