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warm up compensator for M110 engine
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Posted 10/13/2009 8:21 PM
elevatorbernie
Elite Veteran




Date registered: Aug 2006
Location: Vancouver B.C. Canada
Vehicle(s): 1990 280GE
Posts: 1149
1000
Re: warm up compensator for M110 engine

Welcome to the forum, your G may have a different problem. I suggest starting a new topic.
#158618 - in reply to #158603
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Author
Posted 10/14/2009 3:56 AM
macfun
Member


Date registered: Oct 2009
Location: Belgium
Vehicle(s): 1987 280GE
Posts: 5

Re: warm up compensator for M110 engine

elevatorbernie - 10/14/2009 2:21 AM

Welcome to the forum, your G may have a different problem. I suggest starting a new topic.

Well, don't hink so, I had a known-good WUR installed for some days and the 280GE ran then smoothly after cold start.

This topic is very interesting and full of information.
I think I could add mine.
I'll do it later this week, I made lot of pictures, tests and researches before discovering this forum !!!!
#158633 - in reply to #158618
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Author
Posted 10/14/2009 4:42 AM
macfun
Member


Date registered: Oct 2009
Location: Belgium
Vehicle(s): 1987 280GE
Posts: 5

RE: warm up compensator for M110 engine

I found this picture from a french M110 manual.
It shows the WUR like mine (438 140 103).
There is a second membrane ("step" shape in red) to separate top chamber and middle chamber.
Top side outlet (noted "c") is linked to atmospheric pressure.
Side outlet (noted "a", bottom of WUR) is linked to vacuum of intake manifold.
WOT greatly weakens the vacuum at "a".
This lack of vacuum makes the membrane go down, reducing inner spring load on fuel pressure regulator.
It lowers command pressure and makes mixture enrichment.
In red, the second membrane.
In green, the hole in the screw to balance pressure in top and bottom chambers.

Edited by macfun 10/14/2009 4:55 AM




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#158635 - in reply to #84730
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Author
Posted 10/15/2009 12:07 AM
elevatorbernie
Elite Veteran




Date registered: Aug 2006
Location: Vancouver B.C. Canada
Vehicle(s): 1990 280GE
Posts: 1149
1000
Re: warm up compensator for M110 engine

macfun - 10/14/2009 12:56 AM

elevatorbernie - 10/14/2009 2:21 AM

Welcome to the forum, your G may have a different problem. I suggest starting a new topic.

Well, don't hink so, I had a known-good WUR installed for some days and the 280GE ran then smoothly after cold start.

This topic is very interesting and full of information.
I think I could add mine.
I'll do it later this week, I made lot of pictures, tests and researches before discovering this forum !!!!
When you inquired about addding to the post, you had not explained your troubleshooting process and I thought you were looking for advice on a problem that could be caused by several things. I didn't guess you had already have solved the problem...sorry my misunderstanding.... good work, please add to the post and tell which part of your WUR was faulty to cause the rough running after warm-up. Info is always welcomed here. Bernie

Edited by elevatorbernie 10/15/2009 12:13 AM
#158674 - in reply to #158633
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