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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  | RE: warm up compensator for M110 engine Here you go Dave. the thermovalve sits in the exhaust side of the head along with the temp sending unit. Vac lines to throttle body and EGR. Mike (IMG_0229 [800x600].JPG) Attachments ----------------  IMG_0229 [800x600].JPG (70KB - 4 downloads) | |
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| hipine Date registered: Jul 2006 Location: US, CO, Bailey Vehicle(s): 460 1980 280GE w. 617A | RE: warm up compensator for M110 engine DesertStar - 2/25/2009 12:03 PM Here you go Dave. the thermovalve sits in the exhaust side of the head along with the temp sending unit. Vac lines to throttle body and EGR. Mike That's strange. The last paragraph in the WUR operation description seems to me anyway to imply that the vacuum valve 37 somehow vents some line to the WUR and defeats the full load enrichment. Maybe I'm misreading the paragraph, but in the pic you posted above, 37 doesn't have a thing to do with the WUR. Curious...  -Dave G. | |
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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 Dave, I think what it is implying is that when 50 degrees, draws vacuum, from lower port of intake manifold(throttle body), thus causing enrichment(throttle plate opens more) which in turn changes vacuum and causes "something" in the WUR to happen from this change, since both of those two side ports on WUR are connected to intake manifold. I may have it all wrong, my head is still spinning from all this information overload. Mike | |
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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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| elevatorbernie Expert Date registered: Aug 2006 Location: Vancouver B.C. Canada Vehicle(s): 1989 280GE Posts: 1347 | RE: warm up compensator for M110 engine hipine - 2/25/2009 7:16 AM Dave, those pics the Mike posted are not of a basic K-jet system, like on the G. The throttle switch and thermo-vac switch are not used on the basic K-jet. They are for one of the other K-jet systems not the basic model. Here's some pics (M116 engine) of the the k-jet w/lambda....throttle sensor, lambda, thermo valve and 3 port WUR (taken from another MB education manual I have that is only on CIS with lambda control for M110,M117,& M116 engines). I'm not convinced that the 3 port WUR is for the G, at least not mine with basic k-jet no lambda. The last pic ,(from the same manual), shows the 3 port WUR connected up to a thermo-vacuum valve. Also when I check my engine# on the EPC I get WUR that cross references on http://www.specialtauto.com/ web site, to bosch #057 (2 port) for my G, not the bosch #067 (3 port) that's on my G, also my spare engine has a #057 too.elevatorbernie - 2/25/2009 1:20 AM ....I bought a great little MB education/ mechanic trainning manual, circa 1980, the wur is different but the theory is the same. .... The only trouble with this manual is it doesn't show the 3rd port to the upper chamber (it's for old-syle WUR), so yo uhave to extrapolate a little. The pictures and descriptions in Mike's book are lots more direct and correct for the later model you have. (and the 3-port WUR is for K-jet, absolutely) -Dave G. Edited by elevatorbernie 2/26/2009 2:01 AM (K-jet lambda.jpg) (K-jet with lambda.jpg) (3 port wur hooked on k-jet with lambda.jpg) Attachments ---------------- K-jet lambda.jpg (43KB - 4 downloads) K-jet with lambda.jpg (44KB - 4 downloads) 3 port wur hooked on k-jet with lambda.jpg (34KB - 3 downloads) | |
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| RE: warm up compensator for M110 engine Found some important data on my WIS CD for non-European K-Jet. (I think) The top of the WUR is and stays atmosferic. Although atmosferic in this case means; it is connected to the leak-side of the fueldamper and formhoses. The rest off the connections are connected to the manifold. Hell i think you could even use a Y connector to feed the 2 vacuumlines. As u can see in the picture one of the connections for the underchaimber (the lowest) has as restriction (drossel). So; when u hit the gaspedal the vacuum in the upperchaimber 77 (this is not the chamber in wich the bi-metal resides!) is faster gone than in the underchaimber 78 (because of the restriction). Now spring 73 becomes somewhat released). The piston in the underchaimber can move a bit downwards. Now the force of the springs 72 and 73 together reduces en releases some pressure on the membrane en so control pressure drops and mixture enriches. I am sorry for my poor English. Maybe somewone can re-write this explanation and post it here. Edited by Jules 3/23/2009 10:10 AM (wur usa.jpg) (wur usa text.jpg) Attachments ---------------- wur usa.jpg (69KB - 3 downloads) wur usa text.jpg (40KB - 4 downloads) | ||
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| elevatorbernie Expert Date registered: Aug 2006 Location: Vancouver B.C. Canada Vehicle(s): 1989 280GE Posts: 1347 | RE: warm up compensator for M110 engine Your English is good, Thanks Jules. | |
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| RE: warm up compensator for M110 engine I red my post again and again and find I did a pretty good explanation of how the vacuum chambers at the bottom of the 3 connection-WUR works to accomplish a richer mixture. But it was not perfect. Here is a better version: The top-connection of the WUR is atmospheric. Although atmospheric in this case means; it is connected to the formhoses and the leak-side of the fueldamper. The remaining 2 connections are vacuumconnections and must be connected to the manifold; one directly, and one with a restriction plus thermo-switch. As u can see in the technical-picture, one of the vacuumconnections for underchamber 78 has an inline restriction (Drossel). So; when u hit the gaspedal the vacuum in the upperchamber 77 (this is not the chamber in witch the bi-metal resides!) is faster gone than in the underchamber 78. It's because of the restriction. The piston in the underchamber moves a bit downwards, pressed down by spring 73. Spring 73 now becomes somewhat released. Now; the force of the springs 72 and 73 together reduces and releases some pressure on the membrane en so control pressure drops and mixture enriches. Notice that "my" WUR is exactly the one that is in the above picture named "K-jet with lambda.jpg" from elevatorbernie. Now you can put 1 and 2 together; u now know how to connect that 3 connection-WUR and why. Can u believe the science of this thing! That’s maybe this thing costs 1000 dollars :-0 Edited by Jules 3/23/2009 5:25 PM (wur usa.jpg) Attachments ---------------- wur usa.jpg (69KB - 3 downloads) | ||
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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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| hipine Date registered: Jul 2006 Location: US, CO, Bailey Vehicle(s): 460 1980 280GE w. 617A | ||
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| RE: warm up compensator for M110 engine EB: i painted one of your posted picture. Here u can see (red line) how port #2 is connected with the thermovalve. The blue cirkel is the y connector that must leed to the inline restriction and then the manifold. Edited by Jules 3/24/2009 12:26 PM (vac con with restriction.jpg) Attachments ---------------- vac con with restriction.jpg (24KB - 5 downloads) | ||
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| elevatorbernie Expert Date registered: Aug 2006 Location: Vancouver B.C. Canada Vehicle(s): 1989 280GE Posts: 1347 | RE: warm up compensator for M110 engine hipine - 3/24/2009 7:09 AM That's what it looked like but I wasn't sure, then today I found the same page as Jules' in my M110 manual (english) Thanks anyway. elevatorbernie - 3/23/2009 11:31 PM ....Do you know if the (drossel) inline restrictor is part of the WUR's port or is it a seperate part mounted inline with the vacuum hose? Also, which port (as shown in your picture) is hooked directly to the manifold, #1 or #2 ? Thanks Bernie EB - The correct connections are shown for the 3-port WUC in the picture you posted earlier called "CIS INJECTION SYSTEM (1981 M116 shown)" You can see how the ports 1 & 2 map to a & b in Jules' pictures immediately above when you read the descriptions (even though I can't read german, it's easy to recognise like words). Good luck! -Dave G.  Edited by elevatorbernie 3/25/2009 1:47 AM | |
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| elevatorbernie Expert Date registered: Aug 2006 Location: Vancouver B.C. Canada Vehicle(s): 1989 280GE Posts: 1347 | Re: warm up compensator for M110 engine Jules - 3/24/2009 8:31 AM Thank you Sorry EB, i didn't directly answer your question. So here it is: port #1 is hooked directly to the manifold. No long text this time. | |
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| fernweh Date registered: Apr 2006 Location: Calabasas, CA - Centenario, BCS - Luebeck, Germany Vehicle(s): Few Mercedes-Benz, a Toyota Amphibious and a Vespa | ||
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