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| DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156  | RE: W460 Warm up compensator proper vacuum connections elevatorbernie - 1/5/2009 12:20 AM DesertStar - 1/4/2009 11:07 PM Mike where does your other hose go? Also does your wur have 2 ports on the base like the one in my 2nd pic? Mine was hooked up as yours...I reversed A and B....B going to the air slide near where the air conditioning idle valve is. mike I do have two ports...the other connection goes to the air slide that connects to the auxilliary valve and splits to the damper as shown in diagram above and which Inkblotz posted.. See below: Mike (wucbhose.jpg) Attachments ----------------  wucbhose.jpg (42KB - 4 downloads) | |
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| bram_r Expert Date registered: Apr 2007 Location: the Netherlands Vehicle(s): 1984 MB 280GE, 1982 MB 300GD, 1986 Subaru XT 4WD Posts: 1659  | ||
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| DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156 | Re: warm up compensator for M110 engine bram_r - 9/30/2007 5:55 PM Bernie, vacuum connection is on the top connection, atmospheric connection is on the side, just as it should. I've connected everything by the book now, and all pressures are now within spec, only the test of pulling of vacuum connection doesn't give expected results... Somehow I'm not totally clear on this test. If you look at the MB chart of vacuum against control pressure, than it is quite clear that how higher the vacuum, the lower the control pressure is (just as I'm measuring). When you extrapolate the chart to the right, it would be logical to me that if with 0.2 bars of vacuum a control pressure of 3,7 - 3,8 bars is present, that you'll get approx. 4,0 - 4,1 bars of control pressure with no vacuum. This is also exactly what I get on my gauges. So why does MB give a test expectation of 2,8 - 3,2 bars when the vacuum disappears, I don't know. bram p.s. when engine is stopped and no fuel flow is present anymore, than the control pressure actually drops to about 3.1 bars and gradually leaks to about 0 bars (over 40 minutes or so) Bram, what port exactly are you referring to when you say TOP or SIDE. I attached photo, are you referring to this as the TOP ? Thanks, Mike
(pic1.jpg) Attachments ---------------- pic1.jpg (47KB - 4 downloads) | |
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| Inkblotz Expert Date registered: Apr 2006 Location: Georgia Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo Posts: 3186 | ||
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hipine Date registered: Jul 2006 Location: US, CO, Bailey Vehicle(s): 460 1980 280GE w. 617A  | ||
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| hipine Date registered: Jul 2006 Location: US, CO, Bailey Vehicle(s): 460 1980 280GE w. 617A | ||
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| DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156 | ||
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| bram_r Expert Date registered: Apr 2007 Location: the Netherlands Vehicle(s): 1984 MB 280GE, 1982 MB 300GD, 1986 Subaru XT 4WD Posts: 1659 | RE: warm up compensator for M110 engine Hi Mike, this is indeed the proper top connection to which inlet manifold vacuum should be connected to. To add some logic in this; the WUR controls the fuel regulating pressure (FRP) by some sort of adjustable orifice which is opened or closed by spring pressure which itself can vary due to the presence of vacuum. And, fuel injector pressure is equal to system pressure minus fuel regulating pressure if I'm correct. Looking also at the WUR cross sections, you can see that high engine load situation (no/low vacuum) opens up the orifice (due to the abcence of vacuum, lower spring pressure working on that orifice), so FRP is drained to tank and so, as of above formula, injector pressure rises. On idle or cruising situations, with high inlet manifold vacuum (as throttle valve is almost closed), then orifice in WUR will be smaller due to the vacuum and spring force working at it (vacuum signal 'lifting' the spring seat). Now with high FRP, you'll get low fuel injector pressure, thus leaning out the mixture somewhat as it should on this low load situations. I do have to apologise for those pics I made on my workbench where indeed I connected the hoses on the WUR the other way around. Maybe this lead to some unwanted confusion. Anyway, correct is vacuum on top port, atmospheric on side port. good luck and hopefully you'll see some mpg increase  bram | |
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| DesertStar Expert Date registered: Apr 2006 Location: San Diego, CA USA Vehicle(s): 85-280GE/95-G320/08-G500 Posts: 2156 | ||
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| hipine Date registered: Jul 2006 Location: US, CO, Bailey Vehicle(s): 460 1980 280GE w. 617A | ||
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| bram_r Expert Date registered: Apr 2007 Location: the Netherlands Vehicle(s): 1984 MB 280GE, 1982 MB 300GD, 1986 Subaru XT 4WD Posts: 1659 | RE: W460 Warm up compensator proper vacuum connections hipine - 1/5/2009 9:46 PM DesertStar - 1/5/2009 11:09 AM ....Still funny/strange that Brams,Elevator and mine were all hooked up the same. I am extremely curious to see how Woody's is plumbed.... I agree. The strangest bit is the pre-formed hose that Elevator has running from the side port on the WUC and looking like it goes up to manifold vacuum. That pre-form looks specially designed to route from that location. -Dave G. ehm, that was my picture showing indeed the wrong connections  . This is how it was on my G and just took a picture of it on the workbench. I think I need to start this deleting this picture, before you know it, more 280GE's will be running around with wrongly plumbed WUR's...  I do have to admit, in that picture that hose routes really nice on that wrong connection...in real, the WUR is not directly beneath the inlet manifold, but has a off-set, so the routing is still a bit comprimised. Bram Edited by bram_r 1/5/2009 4:41 PM | |
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| hipine Date registered: Jul 2006 Location: US, CO, Bailey Vehicle(s): 460 1980 280GE w. 617A | RE: W460 Warm up compensator proper vacuum connections bram_r - 1/5/2009 1:54 PM ...ehm, that was my picture showing indeed the wrong connections :dunce:. This is how it was on my G and just took a picture of it on the workbench..... Ah HAH! "hoisted on his own petard!" as they say!  Thanks for clearing that up, Bram. Live and learn. What the heck, leave the picture in. It weeds out those that are serious about doing their homework if they have to read the whole thread (as we should ALWAYS encourage) and not just look at the pictures. All the best, -Dave G. | |
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| Woody Extreme Veteran Date registered: Feb 2007 Location: Bend, Ore. Vehicle(s): '84 280GE -> 300GD turbo, '84 300SD veg, 06 Navion Posts: 570  | RE: W460 Warm up compensator proper vacuum connections DesertStar - 1/5/2009 10:09 AM Thanks Hipine, We will see this week if any economy gains. From the start, there are no performance gains as you said. Still funny/strange that Brams,Elevator and mine were all hooked up the same. I am extremely curious to see how Woody's is plumbed. Mike Well, here's to hoping I don't add to the confusion. The side hose appears to go to the intake as you said, but the (four!) others... I'll let the pictures do the talking. Hope you all know what you're lookin at, 'cuz I...  | |
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| Woody Extreme Veteran Date registered: Feb 2007 Location: Bend, Ore. Vehicle(s): '84 280GE -> 300GD turbo, '84 300SD veg, 06 Navion Posts: 570 | RE: W460 Warm up compensator proper vacuum connections hipine - 1/5/2009 12:46 PM You'll owe Woody a case of beer just for getting a decent picture of that thing in situ! -Dave G. I like Anchor Steam!  | |
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| Woody Extreme Veteran Date registered: Feb 2007 Location: Bend, Ore. Vehicle(s): '84 280GE -> 300GD turbo, '84 300SD veg, 06 Navion Posts: 570 | RE: W460 Warm up compensator proper vacuum connections uhhh, try again with the pics: (sized down to 400 x 533) (WUC from top side.jpg) (WUC from front.jpg) (WUC from below.jpg) Attachments ---------------- WUC from top side.jpg (84KB - 3 downloads) WUC from front.jpg (67KB - 2 downloads) WUC from below.jpg (85KB - 2 downloads) | |
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| Woody Extreme Veteran Date registered: Feb 2007 Location: Bend, Ore. Vehicle(s): '84 280GE -> 300GD turbo, '84 300SD veg, 06 Navion Posts: 570 | ||
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| elevatorbernie Expert Date registered: Aug 2006 Location: Vancouver B.C. Canada Vehicle(s): 1989 280GE Posts: 1347 | RE: W460 Warm up compensator proper vacuum connections hipine - 1/5/2009 1:08 PM Bram, I gave you credit in my post for lending me the pic, it was better than the one I have of mine from underneath the G. My is also hooked the same suspected wrong way. Thanks for the pic again bram_r - 1/5/2009 1:54 PM ...ehm, that was my picture showing indeed the wrong connections :dunce:. This is how it was on my G and just took a picture of it on the workbench..... Ah HAH! "hoisted on his own petard!" as they say! Thanks for clearing that up, Bram. Live and learn. What the heck, leave the picture in. It weeds out those that are serious about doing their homework if they have to read the whole thread (as we should ALWAYS encourage) and not just look at the pictures. All the best, -Dave G. | |
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| elevatorbernie Expert Date registered: Aug 2006 Location: Vancouver B.C. Canada Vehicle(s): 1989 280GE Posts: 1347 | ||
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| elevatorbernie Expert Date registered: Aug 2006 Location: Vancouver B.C. Canada Vehicle(s): 1989 280GE Posts: 1347 | RE: W460 Warm up compensator proper vacuum connections Thanks for the picture Woody. There are too many G's now with the vacuum line hooked on the bottom chamber of the wur for me to say it's wrong. I'm going to have to do some more tests. (Woody's wur.jpg) (Bernie's wur.jpg) Attachments ---------------- Woody's wur.jpg (35KB - 2 downloads) Bernie's wur.jpg (49KB - 3 downloads) | |
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| bram_r Expert Date registered: Apr 2007 Location: the Netherlands Vehicle(s): 1984 MB 280GE, 1982 MB 300GD, 1986 Subaru XT 4WD Posts: 1659 | ||
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