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#1
03-06-2004, 11:30 PM
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crankcase vent with webers
Car is a 68 w110 230...
Just put dual webers with open element K&N filters.. Old crankcase vent system went into carb covers and had a drop tube into intake... Should I setup vent to go into both carbs? ONLY? Should I set it up to go into intake? Should I make it go into all three? thanks Brian 
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#2
03-06-2004, 11:35 PM
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With the later zeniths, the vent goes into the cover, but down past the carbs into the manifold. This helps prevent icing from damp blowby. If you're not in an area that will have the car breathing ice cold air, that will not be a problem.
Another thing to consider is the amount of hydrocarbons in the blowby. If it looks like a steam engine's smoke stack and you route it past the carbs, they will collect lots of gunk. Of course that also means there's engine work in the near future, so it might be a moot point. -CTH
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#3
03-06-2004, 11:53 PM
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it doesn't look like a steam engine, but there is some moisture going out the pipe....
Engine has not been run for awhile.. I took the valve cover off to adjust the valves and it looks like it recently had a valve job or something because it's clean as a whistle... it doesn't get cold here... I'm in Baton Rouge, LA... it's 80 degrees right now... Maybe I'll just put a breather on it...? Brian
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#4
03-07-2004, 09:36 AM
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For emission control purposes, you should reroute it back into the input stream. A lot of that vapor will clear itself once the engine has been run a bit.
I take that your manifold isn't the kind that has the little tube dead center between the two carbs. One possible routing is "GM-style", having a it route to the air cleaner, but outside the air filter. They make a little plastic tidbit with a filter pad inside to catch the gunk. Don't know if your air assembly can handle that. -CTH
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#5
03-07-2004, 10:29 AM
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i do have the center tube between the carbs.. it's plugged right now... should I just use this and bypass carbs?
the way it is now, it is going right into the aircleaner.. bypassing the filter element.. i made a T and it goes to both... thanks!
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#6
03-07-2004, 11:38 AM
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If you have the tube in the manifold, use it. The tube has a brass insert with a small calibrated hole. Leave it that way. -CTH
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#8
03-08-2004, 12:02 PM
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Kilgor:
The "GM" method (and Ford and Chrysler, too!) is for the CLEAN air going in, not the blow by going out. You need a source of clean air from the air filter or a small filter like the Ford or GM one AND the calibrated vac leak into the manifold. You had one originally somewhere, PCV has been required in the US since about '62. If you don't have a PCV fitting on the manifold, you will have to route the blowby into the intake of the carbs, and I'd do both -- otherwise you are going to get rough running form more fuel to three cyinders, the intake isn't "mixed" on a Benz. Peter
__________________
1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#9
03-08-2004, 12:57 PM
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kilgor:
I have dual Webbers on my 250C with K&N filters. I used pvc pipe and routed from each K&N into a "t" fitting. From the "t" fitting I ran to the hose from the valve cover. This has worked for over 5 years without a problem. I can get some pics if you would like if that would be any help. Dan
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Dan Taylor/ Tulsa, OK MBCA '84 300D/'90 Jaguar XJ6/XJ40
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#10
03-08-2004, 01:11 PM
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Many German cars of the late '60s - early '70s didn't have PCV valves or PCV systems like those used on American cars. Basically your 230, like most Mercedes up to 1968 had a breather hose from the valve cover to the air cleaner that vented crankcase fumes inside the air filter. To meet new Federal emissions regulations, a metered orifice or PCV port was added in a connecting tube, between the 2 carburetors so that excess crankcase fumes would be sucked into the intake and burned off while the engine was running. If you now have individual air cleaners for each carb, the best solution is to run the crankcase vent to each of them. If you're concerned about air pollution you could tee in an extra fitting to your breather hose and connect it to the PCV port. With the PCV port now plugged, if the car runs OK and no longer requires regular smog testing, I wouldn't worry about it.
Happy Motoring, Mark
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DrDKW
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