Effects of no PCV valve - Moparts Forums

Register Log In Moparts Forums Moparts Question and Answer Effects of no PCV valve

Print Thread

Effects of no PCV valve #746334 07/12/10 12:29 PM 07/12/10 12:29 PM
Joined: Mar 2003 Posts: 710 Harrisburg Pa. 17112 M moparmikethree OP super stock
moparmikethree OP super stock M Joined: Mar 2003 Posts: 710 Harrisburg Pa. 17112	I just realized that my 360 engine in my challenger doesn't have a PCV valve hooked up. There are aftermarket valve covers that have vent breather on either side. The top of both valve covers are damp with oil coming out of the breathers. do i need a pcv valve, and if so how do i hook it up.

Re: Effects of no PCV valve [Re: moparmikethree] #746335 07/12/10 12:52 PM 07/12/10 12:52 PM
Joined: Feb 2003 Posts: 8,670 A Andrewh master
Andrewh master A Joined: Feb 2003 Posts: 8,670	pcv is really emmisions. Vents are fine, but you will get that oil film. You should have a splash shield or filter element on the breather to catch the oil.

Re: Effects of no PCV valve [Re: moparmikethree] #746336 07/12/10 12:55 PM 07/12/10 12:55 PM
Joined: Nov 2004 Posts: 9,312 SoCal 68HemiB master
68HemiB master Joined: Nov 2004 Posts: 9,312 SoCal	Positive Crankcase Ventilation is not simply a "smog device", it is a good thing for total engine health. Removing blow-by, condensation, and the like with a PCV system will result in a much healthier engine than any passive breather or road-draft tube will accomplish. A proper "type IV" system will include two lines connecting to the crankcase. One will be to manifold vacuum, and will contain the PCV valve proper. The other will be the fresh air supply. Ideally, it will pull from inside the area contained by the air filter (to provide a filtered fresh air source), and will have a small dedicated screen-type filter. During normal operation, a small amount of crankcase air (and any excess pressure) will be drawn through the PCV valve into the intake manifold to be burned in the engine. The air will be replaced by the fresh air side. During unusual periods of low vacuum and/or excessive blow-by, the fresh air line can handle the excess load, and flow "backwards" into the carb to be burned by the engine. Down to just a blue car now.

Re: Effects of no PCV valve [Re: Andrewh] #746337 07/12/10 12:58 PM 07/12/10 12:58 PM
Joined: Oct 2005 Posts: 8,860 Ontario, Canada S Stanton Don't question me!
Stanton Don't question me! S Joined: Oct 2005 Posts: 8,860 Ontario, Canada	PCV is "positive" crankcase ventilation. The whole point was to ensure the fumes (moisture) was being drawn out of the crankcase. Had nothing to do with emissions what-so-ever. PCV valves were around long before emissions regs.

Re: Effects of no PCV valve [Re: moparmikethree] #746338 07/12/10 01:05 PM 07/12/10 01:05 PM
Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A. 5spdcuda top fuel
5spdcuda top fuel Joined: Nov 2004 Posts: 1,708 S. Il. U.S.A.	Yes, a PCV should be used. It fits into a rubber grommet on either of the valve covers. A rubber hose connects it to a large tube at the base of the carb. Without positive crankcase ventilation the engine will have condensation and excess contaminates in the oil. It also keeps the outside of the engine cleaner. You do need a breather on the opposite side valve cover. It does NOT hinder performance.

Re: Effects of no PCV valve [Re: 68HemiB] #746339 07/12/10 01:13 PM 07/12/10 01:13 PM
Joined: Feb 2003 Posts: 8,670 A Andrewh master
Andrewh master A Joined: Feb 2003 Posts: 8,670	my mistake. Seen a lot of cars with aftermarket valve covers that don't run them though.

Re: Effects of no PCV valve [Re: moparmikethree] #746340 07/12/10 02:08 PM 07/12/10 02:08 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	just don't make the no breather mistake, adding the pcv valve to substitute for any breather. That don't work.

Re: Effects of no PCV valve [Re: moparmikethree] #746341 07/12/10 02:37 PM 07/12/10 02:37 PM
Joined: Mar 2005 Posts: 493 Arizona A az426john mopar
az426john mopar A Joined: Mar 2005 Posts: 493 Arizona	Before PCV was introduced most cars and trucks had road draft tubes with filters that were cleaned on a perodic basis for crankcase ventilation.

Re: Effects of no PCV valve [Re: Stanton] #746342 07/12/10 03:25 PM 07/12/10 03:25 PM
Joined: Jun 2003 Posts: 21,397 It's a dry heat gtx6970 Too Many Posts
gtx6970 Too Many Posts Joined: Jun 2003 Posts: 21,397 It's a dry heat	Quote: Had nothing to do with emissions what-so-ever. PCV valves were around long before emissions regs. sorry, but this is not entirely true. PCV was/is the 1st real attempt at emissions regulations. It's designed to draw unburned fuel vapors and crankcase/combustion gases byproducts to be re-burned in the engine and not allow them to be vented/escape into the atmosphere

Re: Effects of no PCV valve [Re: gtx6970] #746343 07/12/10 03:31 PM 07/12/10 03:31 PM
Joined: Jan 2003 Posts: 21,065 Niles , Ohio T therocks oh wait.but hey.lets see.oh yeah.
therocks oh wait.but hey.lets see.oh yeah. T Joined: Jan 2003 Posts: 21,065 Niles , Ohio	GTX is correct.It was one of the first attempts at emissions.Ive run 2 breatgers on my 440 for probally 20 years.My kid does the same on his never been apart 413 in his 62 300.The 360 in his truck is the same even though its been run little since rebuild.None have any problems.His 413 sees probally 6000 miles a years street and strip.My built 440 has an M1 and Dominator and neither have vacuum provisions and Im not drilling any when I have no problems.Rocky Chrysler Firepower

Re: Effects of no PCV valve [Re: 68HemiB] #746344 01/24/11 11:48 PM 01/24/11 11:48 PM
Joined: Oct 2010 Posts: 161 Huber Heights Ohio G greenpigs member
greenpigs member G Joined: Oct 2010 Posts: 161 Huber Heights Ohio	Quote: A proper "type IV" system will include two lines connecting to the crankcase. One will be to manifold vacuum, and will contain the PCV valve proper. The other will be the fresh air supply. Ideally, it will pull from inside the area contained by the air filter (to provide a filtered fresh air source), and will have a small dedicated screen-type filter. During normal operation, a small amount of crankcase air (and any excess pressure) will be drawn through the PCV valve into the intake manifold to be burned in the engine. The air will be replaced by the fresh air side. During unusual periods of low vacuum and/or excessive blow-by, the fresh air line can handle the excess load, and flow "backwards" into the carb to be burned by the engine. So if you do not have a fresh air supply will the PCV system not work or is this just in low vacuum situations? I do not have a breather on my valve covers. 69 Charger RT

Re: Effects of no PCV valve [Re: greenpigs] #746345 01/25/11 12:15 AM 01/25/11 12:15 AM
Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska R RapidRobert Circle Track
RapidRobert Circle Track R Joined: Nov 2003 Posts: 36,040 Lincoln Nebraska	As said the PCV replaced the road draft tube in about the '62 or 3 model year. need PCV in either valve cover plumbed to to either the intake (if single plane & if carb has no PCV nipple) or carb base and the other valve cover needs a filtered opening for fresh air to be drawn in (or a closed breather to the air cleaner to replenish the air from there) to replace the fumes that are sucked out. If an evac system in the headers will pull enough fumes out I'd rather not have the controlled vac leak of a PCV but it does add to the worlds pollution & that's assuming a header evac system pulls enough vac live every 24 hour block of time like it's your last day on earth

Re: Effects of no PCV valve [Re: RapidRobert] #746346 01/25/11 12:28 AM 01/25/11 12:28 AM
Joined: Oct 2010 Posts: 161 Huber Heights Ohio G greenpigs member
greenpigs member G Joined: Oct 2010 Posts: 161 Huber Heights Ohio	Quote: or carb base and the other valve cover needs a filtered opening for fresh air to be drawn in (or a closed breather to the air cleaner to replenish the air from there) to replace the fumes that are sucked out. Thats the part I wasn't sure about. Thanks! 69 Charger RT

Re: Effects of no PCV valve [Re: moparmikethree] #746347 01/25/11 01:38 PM 01/25/11 01:38 PM
Joined: Jan 2003 Posts: 338 Montreal Quebec STROKIE enthusiast
STROKIE enthusiast Joined: Jan 2003 Posts: 338 Montreal Quebec	Quote: I just realized that my 360 engine in my challenger doesn't have a PCV valve hooked up. There are aftermarket valve covers that have vent breather on either side. The top of both valve covers are damp with oil coming out of the breathers. do i need a pcv valve, and if so how do i hook it up. I use 2 breathers on my 451 engine since 4 years... No problems at all. For me introducing oil fumes into intake manifold it's not the best octane booster

Re: Effects of no PCV valve [Re: STROKIE] #746348 01/25/11 03:11 PM 01/25/11 03:11 PM
Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas stumpy I Win
stumpy I Win Joined: Jan 2003 Posts: 32,918 Grand Prairie,Texas	There is such a small ammount of oil fumes you will never notice it. There will be no loss of power or any other affects to running a pcv except you won't have the oil slick on the valve covers.

Re: Effects of no PCV valve [Re: stumpy] #746349 01/25/11 04:51 PM 01/25/11 04:51 PM
Joined: Aug 2005 Posts: 4,799 ILL M MLR426 master
MLR426 master M Joined: Aug 2005 Posts: 4,799 ILL	Depends on the condition of the engine it could build extreme postitive crank case pressure and start leaking everywhere trying to push oil out. logan426 Last edited by Logan426; 01/25/11 04:55 PM.

Re: Effects of no PCV valve [Re: MLR426] #746350 01/25/11 06:12 PM 01/25/11 06:12 PM
Joined: Apr 2007 Posts: 4,233 petaluma,ca. u.s.a. west master
west master Joined: Apr 2007 Posts: 4,233 petaluma,ca. u.s.a.	keeping the oil off the road from the draft tube is a type of emission control in itself.

Moderated by Al_Alguire, Hotwheelsjr, moparts, not_a_charger, RangerDan440, tboomer

Hop To

Powered by UBB.threads™ PHP Forum Software 7.7.1