Quote:
Originally Posted by blykins
I don't understand how adding this would make the engine idle and run better, as a PCV valve is emissions control only.
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From what I read a PCV is generally good because it keeps blow-by and moisture out of the engine, and lowers crankcase pressure. If you change your oil every 500mi then maybe you don't care, but if you leave it in a PCV probably helps. If you believe that, then you want a PCV that works properly with your engine.
They claim a few things:
(1) While the PCV that comes with a stock car may be matched perfectly to that engine (I'd assume it is), you are effectively guessing with an aftermarket engine. Consequently, with a random PCV valve, you may be pulling in far more air than necessary at idle or at cruise, making it more difficult to tune the car. If your idle adjustment is off on your carb then the car may not run right throughout the range.
(2) They have data that shows that a stock PCV is open usually from 3-50% of the time. Theirs is adjustable so it's open most of the time, except full throttle. When it is open consistently you don't get a buildup of crankcase vapors and acid. When it isn't you get blow-by and moisture, and possibly excess pressure.
(3) More to do with the oil separator, but it keeps oil out of the PCV flow. Oil lowers the octane of the fuel and can foul plugs over time. And if you have a PCV that is flowing too much, you get more oil in the mixture.
You can check out some of the articles here:
Press and Media Coverage | M/E Wagner Performance Products
Their valve is open at cruise, so they emphasize the importance of valve cover baffles. Mine are fully baffled, so I think the amount of oil I'm getting in the separator seems reasonable and not excessive.
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