WRONG!!!!!
During World War II a different type of crankcase ventilation had to be invented to allow tank engines to operate during deep fording operations, where the normal draft tube ventilator would have allowed water to enter the crankcase and destroy the engine. The PCV system and its control valve were invented to meet this need but the need for it on automobiles was not recognized. [/quote]


Wrong again

In 1952, Professor A. J. Haagen-Smit, of the California Institute of Technology at Pasadena, postulated that unburned hydrocarbons were a primary constituent of smog, and that gasoline powered automobiles were a major source of those hydrocarbons. After some investigation by the GM Research Laboratory (Dr. Lloyd L. Withrow) it was discovered in 1958 that the road draft tube was a major source, about half, of the hydrocarbons coming from the automobile. GM's Cadillac Division, which had built many tanks during WWII, recognized that the simple PCV valve could be used to become the first major reduction in automotive hydrocarbon emissions. After confirming the PCV valves' effectiveness at hydrocarbon reduction, GM offered the PCV solution to the entire U.S. automobile industry, royalty free, through its trade association, the Automobile Manufacturers Association (AMA). In the absence of any legislated requirement, the AMA members agreed to put it on all California cars voluntarily in the early 1960s, with national application following one year later

Quite inflammatory old chap

Hmm wouldn't have anyhting to do with fuel injection or the computers constantly adjusting everything for optimum engine operation and thereby cleaning up the crankcase in the process, Nah didn't think so

I don't know of any car being manufactured today with a carburetor or even recently. And if they are there are no adjustments possible.

Also wanted to comment that engine analyzers and scopes have been around since the late 30's and were pretty common place by the 60's on this side of the atlantic

All internal combustions engines manufactured for use on a daily basis in the last 40+ years use a positive cranckase ventilation system (PCV) or one type or another, they may not have have a valve but they do not allow the crankcase fumes to escape into the atmosphere

Hmm I wonder why that would be????.

]

A computer controlled PCV??? haven't heard of one those yet


What exactly is a non positive closed system????
If you close a system it has to go positive by design.
on the other hand An open system is not a closed system

Also a car going 200 to 500K miles is quite unusual. Maybe you were talking kilometers which would be a bit more possible but still uncommon

PROVE IT with hard facts not opinions. Maybe on a 12,000 RPM race motor but not on a normal vehicle




Enviromentally IMPOSSIBLE


while throwing it in the trash you might want to see if the WWII gas mask is still in there because you'll be needing it

Imagine what the air quality would be like in any major metropolitan area (LA, NYC) would be like today had the issue of crankcase emissions not been addressed.

Through all of you BABBLING you offered no proof of the detriment caused by using a PCV system with or without a valve just your opinion.

 

aaah yes however ONLY the pcv uses the plenum vacuum and returns blowby into the mill as a fuel.....we are actually on the same page i think!......i just did'nt want the boys and girls to think of the two as the same impact on mixture......

 

I actually had to remove my PCV valve on my new 496. The idle is so choppy the PCV would chatter open and closed when idling under 1000 rpms and the echo from the PCV valve fluttering sounding like rods knocking on the left side of the motor. I tried 2 PCV valves and both do it. I ended up installing 2 push in breathers. Quiet as a mouse.....Don't think I wasn't crapping my pants trying to figure that noise out....

The motor makes good vacuum, at least 12" so I am not sure why the PCVs spaz out but they damn sure do.....I guess I'll be opening the hole in the ozone bigger with my oil vapors....

 

Time for some 101 on the difference between an "open" crankcase ventilation system vs. a "closed" system.

The closed ventilation system is what's used on our C3's which uses a PCV valve and fresh air pulled into the crankcase by vacuum from the carb.

An "open" crankcase ventilation system used in the 40's, 50's and 60's (up 1968 on Chevy's) used a draft tube which pulled harmful vapors from the crankcase as the tube 'drafted' down the road.

Here's a schematic of an "open" crankcase ventilation system:

http://www.tpub.com/content/armyordn...OD10010120.htm

 

I'm still awaiting an answer to the question of how a pair a breathers solves this problem:

"As an engine runs, gases from the cylinders leak past the piston's sealing rings into the crankcase (containing the crankshaft and other parts). This leaked gas is sometimes referred to as "blow by" because the pressure within the cylinders "blows" them "by" the piston rings. These gases include compounds harmful to an engine, particularly hydrocarbons (unburned fuel), as well as carbon dioxide and water vapor. If allowed to remain in the crankcase, or become too concentrated, the harmful compounds will condense out of the air within the crankcase and form corrosive acids and sludge on the engine's interior surfaces. This can harm the engine as it tends to clog small inner passages, causing overheating, poor lubrication, and high emissions levels. To keep the crankcase air as clean as possible, some sort of ventilation system must be present."

The above is from here:

http://www.yourautonetwork.com/pcv_valve.html

And I'm still awaiting one credible document recommending the use of a pair of breathers vs. a PCV system. Again, here's a good place to start: www.google.com

 

In answer to the following forum member's, in no particular order.

FB007
TJP440
73, Dark Blue 454
leetownreb

I shall not be answering your comments as you have demonstrated insufficient knowledge to understand the conversation.

In the same way it's pointless for a brain surgeon to explain to a medic how to remove a brain tumour, I wont be drawn in to a discussion with people who lack the necessary training to understand the subject matter.

 

Glad you're not my surgeon LMAO

 

Did you copy and paste that from Wikipedia too?

 

Boys, play nice in the sandbox. I think there are a couple of good options to vent gases from the engine and believe there is a personal choice to make.

 

Funny you say that. I found this organization was founded (invented) by an Englishman too.
http://en.wikipedia.org/wiki/Flat_Earth_Society

 

Simply putting a laughing smiley on the end of a post doesn't make it funny.

Neither statement has anything to do with the other.

It's like you asking if I copy and pasted something.

Then my response being.

"Funny you should say that, how long are Americans going to keep taking credit for capturing a WWII Enigma machine".



OMG OMG that's soooooooooo funny!

 

Sounds like a lot of gases are being vented here, too.

 

We prefer to take credit for the fact you don't speak German.

 

IBTL.

 

Just can't stop, can ya?

 

Yep, already have, I didn't say I'd shut up, just not discuss PCV with people who don't have the knowledge to grasp the subject matter.

HTH

 

Hth?

 

HTH

 

Yea, in a ******** sorta way, I suppose you're pretty helpful.

 

Can you add me to the list too?