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  #1  
Old 02-20-2017, 02:56 PM
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Join Date: Aug 2005
Location: Napa Valley
Posts: 349
M110 advice.

Photo 1 shows that the original inlet for the valve cover vent was placed befor the throttle plate on the throttle body. Photo 2 shows the setup I would like to use,
makes everything much easier, which puts the vent after the new T/B. Any reason why this won't work?? I could drill a hole in the new T/B befor the plate if necessary or just run a hose off the vent to under the engine but prefer not to. Any comments appreciated.
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  #2  
Old 02-20-2017, 08:58 PM
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Join Date: Feb 2011
Location: Modesto CA
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jd:

The OE configuration provides air at atmospheric pressure to the inlet of the crankcase ventilation system. At low power settings/throttle openings air flows through that hose into the interior of the engine, and then is extracted through the vent valve/orifice that is located immediately behind the inlet hose, and into the inlet manifold. At high throttle openings/high RPM the flow is partially reversed due to higher crankcase pressure, and the blow-by gasses escape through the inlet hose, and are drawn into the air entering the inlet tract.

If the vent hose is connected directly to the plenum downstream of the throttle, the connection that was originally an inlet to the vent system will become the sole effective exit from the crankcase, and more significantly, will introduce a large amount of un-throttled air/blowby into the plenum, thereby substantially increasing the idle speed, and there will cease to be any source of fresh air into the crankcase.
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  #3  
Old 02-21-2017, 01:43 PM
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Thanks Frank. Your description with the drawing cleared things up. Couldn't see how the vent could be both an inlet and outlet the way Benz showed.
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  #4  
Old 02-27-2017, 03:32 PM
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Frank.
Took your info and redid the vent to match the original. Plastic tubing is from the original IAC so should be fine. Thanks again.
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