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Do I need a PCV Valve and Breather? #714333 06/02/10 05:02 PM 06/02/10 05:02 PM
Joined: Mar 2003 Posts: 3,358 Berwyn, IL challenger70 OP master
challenger70 OP master Joined: Mar 2003 Posts: 3,358 Berwyn, IL	What exactly do each do and do I need a PCV Valve? Any Advantages to having a pcv valve? This would be for a 60's era 440. A rookie question I know but I never knew for sure.

Re: Do I need a PCV Valve and Breather? [Re: challenger70] #714334 06/02/10 05:12 PM 06/02/10 05:12 PM
Joined: Jan 2003 Posts: 32,944 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,944 Grand Prairie,Texas	The breather allows air in one side of the engine and the PCV pulls the fumes and pressure out of the crankcase and runs them back through the engine to be burnt. Without the breather you wouldn't have the necessary crossflow. Without the two of them working together you would build up pressure in the crankcase which results in oil getting blown out of all the seals. Using a breather in each valve cover will result in oil being blown out of them and all over the engine.

Re: Do I need a PCV Valve and Breather? [Re: stumpy] #714335 06/02/10 05:40 PM 06/02/10 05:40 PM
Joined: Mar 2003 Posts: 3,358 Berwyn, IL challenger70 OP master
challenger70 OP master Joined: Mar 2003 Posts: 3,358 Berwyn, IL	Cool, thanks for the great explanation, I wasn't sure if the PVC was related to some emmissions stuff I don't need.

Re: Do I need a PCV Valve and Breather? [Re: challenger70] #714336 06/02/10 05:46 PM 06/02/10 05:46 PM
Joined: Aug 2005 Posts: 11,543 chicagoland,usa B buildanother I Live Here
buildanother I Live Here B Joined: Aug 2005 Posts: 11,543 chicagoland,usa	The pcv DOES keep the oil aroma down while at stoplights, etc.

Re: Do I need a PCV Valve and Breather? [Re: challenger70] #714337 06/02/10 08:06 PM 06/02/10 08:06 PM
Joined: Dec 2007 Posts: 7,759 So Cal HealthServices Why would you even post that?
HealthServices Why would you even post that? Joined: Dec 2007 Posts: 7,759 So Cal	Quote: Cool, thanks for the great explanation, I wasn't sure if the PVC was related to some emmissions stuff I don't need. It was one of the first and it was a good thing that we have them because before that there was only a draft tube. Allen Here's a novel idea, let's not throw a bunch of parts at the car hoping it will fix the problem and instead spend a little time diagnosing it first. Life was a little easier when I was just a wrench.

Re: Do I need a PCV Valve and Breather? [Re: HealthServices] #714338 06/02/10 08:12 PM 06/02/10 08:12 PM
Joined: Nov 2004 Posts: 9,312 SoCal 68HemiB master
68HemiB master Joined: Nov 2004 Posts: 9,312 SoCal	Quote: It was one of the first and it was a good thing that we have them because before that there was only a draft tube. Yes. Good. Positive Crankcase Ventilation is a much more complete way to remove water vapor and other undesirables, when compared to a passive system. Disclaimer: Does not work well for removing visiting in-laws who have over-stayed their welcome. Down to just a blue car now.

Re: Do I need a PCV Valve and Breather? [Re: 68HemiB] #714339 06/02/10 09:50 PM 06/02/10 09:50 PM
Joined: Aug 2008 Posts: 1,568 Omaha, Nebraska Scott Carl pro stock
Scott Carl pro stock Joined: Aug 2008 Posts: 1,568 Omaha, Nebraska	Quote: Quote: Quote: Cool, thanks for the great explanation, I wasn't sure if the PVC was related to some emmissions stuff I don't need. It was one of the first and it was a good thing that we have them because before that there was only a draft tube. Yes. Good. Positive Crankcase Ventilation is a much more complete way to remove water vapor and other undesirables, when compared to a passive system. Disclaimer: Does not work well for removing visiting in-laws who have over-stayed their welcome. This really was a great innovation. The roads are actually clearer of oil, especially in the center. That was typically where the "draft" or "blow-by" dumped the gunk that pvc system collects. Its still bad but in early years, the center of the road was the worst place for a motorcyclist to be when it started raining. Can you say, "Slip'n'Slide"??

Re: Do I need a PCV Valve and Breather? [Re: Scott Carl] #714340 06/02/10 10:20 PM 06/02/10 10:20 PM
Joined: Feb 2003 Posts: 10,218 Someplace you aren't S SomeCarGuy I Live Here
SomeCarGuy I Live Here S Joined: Feb 2003 Posts: 10,218 Someplace you aren't	Any advantage to having the PCV on one side or the other? I notice the factory changed sides around 70. So I gather that the drivers side must have had an advantage. I want my fair share

Re: Do I need a PCV Valve and Breather? [Re: SomeCarGuy] #714341 06/02/10 10:23 PM 06/02/10 10:23 PM
Joined: Jan 2003 Posts: 32,944 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,944 Grand Prairie,Texas	Probably cheaper and more room. No a/c or heater hoses to deal with. There is no real reason to favor the driverside.

Re: Do I need a PCV Valve and Breather? [Re: stumpy] #714342 06/02/10 10:34 PM 06/02/10 10:34 PM
Joined: Jan 2007 Posts: 7,664 IN A ahy master
ahy master A Joined: Jan 2007 Posts: 7,664 IN	The spinning crank will throw more oil on one side at high RPM. Its best to have the breather on the opposite side to reduce the possibility of sucking oil. I think this favors (slightly) putting the PCV on the pass side. Last edited by ahy; 06/02/10 10:36 PM.

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