catch can research shows it's worthless

[ipimpthisc]

Originally Posted by brantley847

I will take the word of SC2150, Apex, Ted Jannetty, Maryland speed and a few other top name vendors on this website over someone who calls them self "WORLD CLASS", last GM "certified world class" tech I met told me he didn't feel comfortable doing a VVT cam install and tune and would only work with me if I was willing to do a conversion...

The horse has been beaten to death...

[DietCoke]

RX Performance (SC2150) sells breathers. They are a site sponsor.

http://www.byunspeed.com/product_inf...ducts_id=19066

[ParisTNDude]

I just did a head gasket replacement on my 84 Corvette with 94,000 miles on it and I can tell you the tops or valve stem side of the intake valves had quite an oil buildup. I can't imagine that condition would aid in the flow of air to the cylinder. I don't think that gunk can come from the gasoline, but I don't know. As for manufacturers recommendations, they still insist you change your oil every 3K miles which most would agree is a waste of money, especially in the modern engines of late. I have a catch can on my car, but haven't drained it yet...gonna do that this next week and it will be interesting to see.

[CC Performance]

Originally Posted by DietCoke

RX Performance (SC2150) sells breathers. They are a site sponsor.

http://www.byunspeed.com/product_inf...ducts_id=19066

If your going to buy an Rx product buy it from Tracy or a sponsoring vendor....

I've had the heads of many an engine and the buildup on the valves and intake runners is real. Catch cans are not some gimmick to make money they serve a good purpose.

[axis]

As has already been posted, there is no OEM CC cause the vast majority of people would NEVER drain it. Hell, many never change their oil. Many people just want to put gas in and drive. Is it absolutely necessary, obviously not since the design of pretty much every engine is to route it back into the intake where the vapors that aren't cooled to liquid will burn. The "world class mechanic" never addressed the issue of oil build up in the intake. If you feel that oil build up in your intake isn't a problem, then by all means don't use one. People spends thousands of dollars to make their cars run the best they possibly can and this is just one little insurance policy to keeping junk out of your intake.

[Stitch]

Those who think a catch can is worthless can think whatever they want. When I dump a quarter quart of oil out of mine, that would instead be in my intercooler, intake or motor, I'm glad that I have one.

[CAP'N B]

As you put miles on the engine and you wear the cylinder and rings you will get more compression blowing by the rings into the crankcase and it will get worse. Most diesel engines vent these gasses into the atmosphere. I have seen this on a 5 year old 3412 caterpillar get blown about 15' up to the top of the exhaust stack and pour out onto the upper deck and make a puddle overnight. So if diesel engine manufactures don't put it into the intake why should gas engines. I don't have one yet but I am reading up on it and will probably get one.

[mikeSS]

Originally Posted by CAP'N B

So if diesel engine manufactures don't put it into the intake why should gas engines. I don't have one yet but I am reading up on it and will probably get one.

its either we put more stress on our engines, or hurt the environment more. ok you have built up at like 100k+ miles. engines are not built to last forever.

a catch can is a good idea, its get extra oil that some people are worried about, at the same time is environment friendly. but i just cant see GM or any brand making them a OEM part, because people will not take care of them. maybe if they made a system that was a lot easyer or something.

[BigRed585Lbs]

Opinions are like.......
I'm keepin' my can!

[SLO RYDE]

Originally Posted by cowboy1948

Where did you get the chrome one from in the pic?

Here is where I got my chrome cap:

http://www.camaro5.com/forums/showthread.php?t=157309

[Bell040]

http://www.camaro5.com/forums/showth...02#post2521502

post # 156 from Robin Lawrence ...

I am not a big fan of catch cans. On a race engine with a lot of boost and wet sump oiling they solve a lot of problems. They became really popular with the LS1, LS6 and the LS2 engines. As the OEM's were able to improve the ring seal on the later LS engines I didn't think they were really needed. There are a lot of vendors out there who will sell you something that you don't need.

[cowboy1948]

Originally Posted by Bell040

http://www.camaro5.com/forums/showth...02#post2521502

post # 156

Nice find of that post. I never thought of the engine temp staying above 180. but it does make sense.

[CC Performance]

Oils are made to react at certain temps, cold start is the hardest on an engine and always has been. Yes some oils are better than others but to say its just tuning and oil is false. I vent to atmosphere through a catch can.. what gets trapped is 99% water and 1% oil... that 1% oil I do not want on my titanium valves simple as that.
Personally I dont care what a person does to their car. I run a can on my engine because I have seen up close what happens when you dont.
The thing that post 156 leaves out and its from lack of experience with these engine is what I can see is that the clean air system for the car used to revert at higher rpms and cause a lot of the consumption... GM has been smarter about the system but its not flawless.

You want flow in one direction on the crank case.. thats what the check vavle ( PCV) is for .. to keep flow in one direction...

Do you need vacuum ? No, the harmfull vapors and moisture will get ejected as soon as the engine gets to temps.. but its better on the oils seals to have a small amount of vacuum on the crank case instead of + pressure pushing the seals outward.

The biggest thing is getting the car/engine to temp before beating on it.. trans fluid as well is effected by cold and heat..... oils take into consideration the operating temps at which they will be used.

[RocketCutlass]

If a catch can could be created that drained back to the crankcase that would mean you would not have to service them. I don't know how strong the vacuum is through them, but you could put a drain with a one way valve to avoid it sucking fumes from the crankcase through the drain tube while the car is running. When you shut down for the day, the oil drains back to the pan. Seems like a feasable thing to do.