PCV or not?

[janbanan]

I installed a catch can and removed pcv. Was that wrong? My thinking since I have a big cam, my vacuum should be better without it.

 

[PurpleBeeper]

I've wondered that myself. I have no experience with catch cans. The only thing I'm pretty sure about is that you want to have some type of vacuum on the bottom end of the engine (more than any piston blowby) so you don't build up any pressure in the crankcase & start blowing out gaskets/seals everywhere and make the engine start bleeding oil.

If you catchcan is connected to a vacuum source, such as a nipple on the header collectors, and gets vacuum there AND is connected to your crankcase to it gets vacuum too (again, I don't know jack about catch cans), then I think you'd be OK.

 

[68 HEMI GTS]

Street engine, I'd run the PCV.

 

[Zeppelin264]

Definitely need a PCV valve.

 

[66chargerpat]

 

[Lelo 500]

PCV without a doubt. I experimented with different PCV valves at the part store by drawing air though them to find a better match for my application. Wound up using a Ford PCV. Or...you could get that high dollar adjustable one. Hope this helps.

 

[Lelo 500]

66chargerpat- The PCV helps keep moisture and nasty stuff from building up inside your crankcase and shortening the life of your engine.

 

[66chargerpat]

Sorry I'm drunk

 

[RJRENTON]

Why in the **** would you need a fucken pcv valve ! That **** is for epa bullshit, it does not do a thimg to help your engine or you . Take that hose and snort that **** up! That is ******* poison !

I've not read any totally uneducated comments such as this for quite sometime! Such crude and unwarranted commrnts have ZERO place in this forum....perhaps the author could learn a few new methods of expression or words?? Just my opinion of course.
RJ

 

[66chargerpat]

sorry, PCV valve started in 1963 by epa . It not to help your engine or You . Your engine put out a lot of crappy stuff.

 

[dvw]

Why in the **** would you need a fucken pcv valve ! That **** is for epa bullshit, it does not do a thimg to help your engine or you . Take that hose and snort that **** up! That is ******* poison !

Really? On the street it helps keep the crank case fumes out of your nose. Keeps the engine compartment cleaner if that's something you care about. Hide it in the valley and it doesn't show. Explain the negatives? By the way, the EPA was started in 1970, first PCV 's were required in 1961 in California.
Doug

 

[khryslerkid]

Cleanup in Isle 5 !

 

[Photon440]

Sorry I'm drunk ,get a can or vent that **** to the road. That **** is ******* poison for your car and you! Why would you put that **** back in to your engine?!

You don't have to put it back in the engine. Put the catch can inline with the PCV hose and catch the oil before it enters the intake.

 

[SoCal440GTX]

I think booze explains a lot here. I'm giving him a pass.

 

[Steve Garner]

I don't believe the EPA ever required the use of PCV valves. It was the vehicle manufacturers wanting to extend the life of the engines that brought them in. You need a way to move air through the crankcase, replace the contaminated, moisture laden vapour with clean dry air. Before there were pcv valves cars all had road draft tubes. Road draft tubes extended below the engine beneath the car and were cut off on an angle so that the air moving past the end of the tube created a vacuum in the tube and drew vapour from the crankcase. Trouble with that was they only worked while the car was moving. If all you're doing is providing vents, you're missing the boat.

 

[Photon440]

You're right, it wasn't the EPA that instigated them. California's Air Pollution Control District required them starting in 1961, New York State's similar agency in 1962 and most other states by 1967 with the passing of that year's Air Quality Act. The EPA itself wasn't established until Nixon enacted it in 1970.

 

[383man]

Really? On the street it helps keep the crank case fumes out of your nose. Keeps the engine compartment cleaner if that's something you care about. Hide it in the valley and it doesn't show. Explain the negatives? By the way, the EPA was started in 1970, first PCV 's were required in 1961 in California.
Doug

Yes it does help just as Doug said. It also helps keep pressure from building up in the crankcase better then just breathers do. And when you floor the gas pedal your vacuum drops to right about zero and the PCV will close so it does not even pull any crankcase fumes into the eng when its floored for max power. I run one on my 63 as its good when you don't always take long runs in your car so moisture don't build up in the crankcase so easy. You should always run your car until it reaches operating temp so it will keep moisture buildup down in the crankcase but I see many guys in their hotrods just take short trips many times and not get the eng warm enough and the PCV system is good to have when you do that to much. Ron

 

[janbanan]

Sorry I'm drunk ,get a can or vent that **** to the road. That **** is ******* poison for your car and you! Why would you put that **** back in to your engine?!

Well.....rude or not but your thinking is the same as mine. I want fresh air to my intake and I have a hose from catch can and out "to the road". Does the pcv have any purpose except environment reason?If it does I could hook it up before catch can and still keep my intake clean?

 

[Bill Monk]

I have no knowledge of catch cans but I can tell you that I work with someone that just blew a rear main seal on a 2012 cheby because in the cold temps we have been having, ice and sludge restricted the pcv valve. Crankcase pressure caused the failure. This just happened Friday, run a pcv on the street.

 

[68 HEMI GTS]

Well.....rude or not but your thinking is the same as mine. I want fresh air to my intake and I have a hose from catch can and out "to the road". Does the pcv have any purpose except environment reason?If it does I could hook it up before catch can and still keep my intake clean?

Read the above posts, it was explained very clear I thought.