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1967 250S Weber conversion?
Has anyone done this? Is there really an advantage to converting them? My carbs are out of adjustment and before I start investing a lot of cash, I'm wondering if it's better to just get Weber carbs.
Are they a direct replacement? I saw them listed here: http://www.alamomotorsports.com/weber/mercedes_carb.html They web site says they come pre-adjusted. I'm a bit leery of trying to work on the Zenith carbs I have.
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1982 300SD 1967 250S ...what was I thinking...... |
#2
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So $840 is not a lot of cash compared to tuning the zeniths?
I run zeniths on my 72 250. I'm very happy with them I don't find it hard to tune them. Manual has all the steps you need. Unless your carbs are warped ( & even then) you should be able to tune them pretty easily.
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72 250 M130 W114 |
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Quote:
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1982 300SD 1967 250S ...what was I thinking...... |
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Yeah my time is worth money as well, but if I didn't enjoy tinkering with these old beasts then I would have bought a Toyota.
It's really not that hard, and you'll have to do this with the webers anyhow. I know they say it's pre-adjusted, but they have no way of knowing if all your valves are adjusted properly or there is a different compression ratio between cylinders or anything else that will throw off the adjustments. Here is a online zenith manual http://www.jaimekop.com/CarbManual/ You first need to set your timing and idle speed. Idle speed is done by the adjuster located on the back of the carb. Separate the link from the front to back. Then you'll need to set the mixture screws. I like to use a vacuum guage and get the maxumim vacuum. Then you'll need a sync tool like a unisync or the jc whitney sync tool and an adapter. You can buy one or sacrifice a plastic ziplock container and make the adapter. Go back & forth and adjust the idle speed nuts until they are sucking the same amount of air. Re connect the links and make sure the lenght is correct. If the RPMs jump up or one carb is sucking in more air than the other, you'll need to re-adjust your links Turn off the engine, set the fast idle ( move the linkage back and close the choke ) start teh engine and measure the gap as the engine is running. It should be 2.2 mm. If not then use the aduster located on top of the auto choke housing. That's it. That's all.
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72 250 M130 W114 |
#5
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BAM. Exactly what I need to tune the Zeniths on my 280S. Directions...
Thanks! |
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Quote:
Well, once you get old enough to realize your time is worth money the equation changes..... For me, it's therapy now, rather than economic.... That said, drove my Weber equipped 71 250C into work today. I cannot say enough about the transformation these carbs had on the car. I love them! Once dialed in, they work seamlessly. Car starts immediately when cold (no need to even pump the throttle), settles into a buttery idle, electric chokes pull off automatically and no stutter, stumble or hesitation when either hot or cold. Maybe not original, but you cannot tell once the air cleaner is on. I remember spending hours in the early seventies screwing around with the twin Solexes on my 190SL, and finally biting the bullet for a pair of Weber 40DCOEs. Same transformation, that 190SL ceased to have any carb problems or need for periodic tweaking and ran great for 6 more years until sold. Probably ran great for many years thereafter, but I lost track of the car a few years later. If the cash outlay is not a problem, you will not regret the modification. Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles |
#7
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Use the 'Search' feature....
and plug in the word 'Weber'.
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1970 280S M130 engine- good runner 1971 250 M130 engine- #2 rod bearing, gone 1971 280SE (blown engine,parts car) 1977 German 280S W116-only 33 years old |
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