Many thanks for such a great response. I hope I haven't started a religious war with D- vs K-Jet!
Setting up the K-Jets was not so difficult -I'm an engineer by profession, but for me the D-Jet is unknown territory. Have to admit I heard *horror* stories about the 250 with carburetor! My father-in-law had one of these in the 70s and even then was difficult to find someone who could keep it setup. That problem despite that he is living in Stuttgart where all this Mercedes stuff is coming from! Some folks reckon the D- has advantages with less moving parts that get worn or stick. Electrical components and wiring is not resistant to aging either: I just got a blown Blinker relais last week and could not get a direkt replacement. Mercedes oldtimer has it's own special pin arrangement. In the end I popped that badboy and replaced a Condensor, two Diodes and the IC - now all is good again
What's worrying it that you can drive without the blinkers, but if the ignition does something like this then I have to explain to my wife why she can now tow me home and no, I need her car for a little while, and yes, the children can walk a bit more..
@Raptelan that's interesting stuff about your D- and K-Jet direct comparison. I know that someone nearby in Munich who converted his 350SE using an accidented car. The new motor and systems had less than 100,000km on them! If I get a chance I will get some feedback on his experiences. In theory the conversion might not so painful, as the K has little connection to the loom but is pressure/temperature controlled. Especially if the whole car with motor accessories is available.
@jbrasile about the fire issue: A guy from our workshop had an engine fire from his 280 W123. That thing had a carb and he was saying that it's not unknown to have the fire department called with these cars! I had some trouble also with my ECU some years back and almost died at the price of a replacement. Ebay wasn't so big then! Thank you also for your impressions about the driving feel (fahrgefühl?). Another one from our workshop has a W126 380SEL and it drives like you say. Massive bonnet, *very* smooth and quiet motor, instant gas response and suspension gives a gliding feeling. He's getting from 11.5 to 13l/100km on landroad, about 15 or so around town. That's great, but it just isn't a 116 though!
About fuel consumption. I live out in flat country, *real* flat, and drive 80-110km/h on open roads.There is practically no town driving for me. If I got 13l/100km on that landroad I'd be more than happy! Another option is not to sell my W123 but register it for winter months only, something quite common here. Not many want to take their perfekt W108 Heckflosse for -15C salt baths and rocking it back and forwards with the automatic to get off the side of the road!
The main point I am looking at with the 116 is how good the bodywork is from the 280 and 450 that I found, as I had a bit of an overdose with hours of welding the W123! You can get repair plates for all the problem areas of the 123 because there were so many produced. I don't yet know if these are so (cheaply) available for the 116. I am using Mike Sanders body sealer always, this is *the* favorite oldtimer anti-rust here. It creeps slowly into every rusty corner in hot summers and is like solid turkey fat in the winter cold, mmm. My workshop friend used Fluid Film on his '67 T-Bird, but that stuff kinda stinks out the cabin (everyone is telling him this but he is not listening any more)
Both 280 and 450 have strong points. I really appreciate the opinions of those in the forum for helping here. Maybe next week I testdrive the 450, at the moment it's snowing here and I don't want to plant another road carrot like last winter. The 280 gearbox is still attractive: A M102 motor with Getrac|Zeppelin gearbox is not supposed to last as long as the 4 gear but I didn't manage to make it kaput yet. This is my second one, the last one was pulled out of the railway side last year with 265,000 km gearbox still working perfekt. With luck, the 5 gear would reduce the noise, 'buzz' and fuel from the double cam six on longer travels like it does on the 102 motor. The rarity thing would make a replacement almost impossible, so it would be worthwhile rebuilding in the event of an..
PS, @Type17: I'm biased too: I'm driving a code 881 Silberdistel which was an, um..acquired taste!