xtremerevolution Posted April 27, 2009 Report Share Posted April 27, 2009 I've seen them on cars before as a filter that sits in place of the cap to the crank case. What are they for? Is there any benefit to having one? I'm speaking specifically in regard to my 3800 and my Jaguar V12. Thanks. Quote Link to comment Share on other sites More sharing options...
jake91 Posted April 27, 2009 Report Share Posted April 27, 2009 i have wondered this also Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted April 27, 2009 Report Share Posted April 27, 2009 its the equivilant of a PCV system, except instead of the engine sucking in the fumes, they just go off into the atmosphere. Elky has one, my dads 70 monte has one, his 70 javeline has one... get the picture, it essentialy removes one more thing that could go wrong. i see them on boosted cars all the time, because of how much crankcase pressure they build, PCV is often not an option Quote Link to comment Share on other sites More sharing options...
tdvs Posted April 28, 2009 Report Share Posted April 28, 2009 Basically, valve cover breathers are pre emissions technology from back in the olden days when it was ok to polute the air As stated previously, they are still used today tho, but for limited application. And I'm sure it's frowned upon by the environmentalists Quote Link to comment Share on other sites More sharing options...
Brian P Posted April 28, 2009 Report Share Posted April 28, 2009 Technically if you have the PCV still functional, the oil crankcase breather will be taking IN air (though very little) due to the slight vacuum inside the crankcase. In this case, you can eliminate the fresh-air hose going from the air inlet tube to the valve cover on *some*engines (depends on the orientation of the fresh air hose to the breather). Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted April 28, 2009 Report Share Posted April 28, 2009 Technically if you have the PCV still functional, the oil crankcase breather will be taking IN air (though very little) due to the slight vacuum inside the crankcase. In this case, you can eliminate the fresh-air hose going from the air inlet tube to the valve cover on *some*engines (depends on the orientation of the fresh air hose to the breather). wouldn't blow-by cause a slight amount of pressure? Quote Link to comment Share on other sites More sharing options...
Brian P Posted April 28, 2009 Report Share Posted April 28, 2009 Technically if you have the PCV still functional, the oil crankcase breather will be taking IN air (though very little) due to the slight vacuum inside the crankcase. In this case, you can eliminate the fresh-air hose going from the air inlet tube to the valve cover on *some*engines (depends on the orientation of the fresh air hose to the breather). wouldn't blow-by cause a slight amount of pressure? If it's anything significant, yeah. But a PCV system is designed to provide more vacuum to the crankcase than the pressure introduced thru any minuscule blowby in normally operating engines. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted April 28, 2009 Report Share Posted April 28, 2009 by what you posted earlier, i thought you were saying that a crankcase generated vaccum and would suck air out of the intake... my question make sense now? Quote Link to comment Share on other sites More sharing options...
Brian P Posted April 28, 2009 Report Share Posted April 28, 2009 OH ok... I'm usually not too concise with my typing. Quote Link to comment Share on other sites More sharing options...
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