Hey guys. For the longest time now, I've been wanting to eliminate the PCV system for something much less messy and more efficient.

Last night was the first time I had ever heard of a CCE system. Stumbled on it while surfing through jegs.

I do have concerns though. This car is a daily driver currently, soon to be retired to weekend cruiser but I'd still want the reliability to be there. A friend said something about it decreasing the MPG like 3 - 4 which I'm calling BS on. I don't believe there is nearly enough blowby gasses in the crankcase to make THAT much of an impact on fuel economy. Not to mention the increased vacuum will aid in better ring seal decreasing blowby.

However, my single biggest fear are exhaust gasses backing up into the crankcase if a checkvalve were to fail. I remember reading on here some time back a guy had a checkvalve on his AIR injection system go bad, allowing exhaust gasses to back up into the AIR hose and melt it. I was thinking as a failsafe maybe I could install a second checkvalve at the valve covers in case the one at the collector fails. If I see any melted hoses, that's a sure sign of failure. Of course, if the checkvalve at the valve cover fails first that defeats the safety feature.

This is the only thing making me hesitant to install a CCE system, since you can't tell a bad checkvalve by just looking at it. Otherwise, the system seems to be a godsend. I would also want to put an oil catchcan just below each valve cover to prevent excessive oil making It's way into the exhaust.

An oil temp gauge would certainly alert me of anything abnormal going on, but by that time plenty of unwanted exhaust gasses have already made their way into the CC contaminating the oil.

What do you guys have to say about it?

 

There is much debate as to whether a mufflered exhaust system can generate enough flow ( vac) to make it worthwhile on the street.
Note most race cars running it have open headers

 

I run mine with open headers at the track, and with a free flowing exhaust system on the street. It creates A vaccum either way, but the vaccum is definiteky stronger with open headers. What it does not do is put positive pressure in the crankcase, and my motor was constantly creating a new oil leak without it, now that problem is solved.

How in the world could it affect your gas mielage? I am pretty sure that there is no way it would hurt your mielage. Like you stated, the crankcase vaccum is a good thing and can only help mielage, but I would doubt it would be a noticeable change.

 

My friend's theory is that instead of the combustible blowby gasses being sucked straight out of the exhaust vs being recycled back into the combustion chamber would lower gas mileage by about 3MPG in his estimate. I said maybe 1MPG if that. I don't think there are nearly enough combustible blowby gasses to notice a difference. And the increased ring seal would cancel out the blowby theory.

So your saying you preferred the CCE to the PCV system, or you think it ran better with PCV? Personally, I view the PCV system as a contamination of the air/fuel mixture plus a good way to gunk up your intake, but that's just me.

Another question, what exactly classifies a free flow exhaust system? Would that be glass packs? I saw one guy running a crankcase evacuation system on his first gen and he said he originally had flowmaster exhaust, which was decent but did not create a very large amount of vacuum. He said he switched to free flow exhaust and was able to pull 8 - 12 degrees of vacuum through the CCE system.

Also, what is your take on the failing check valves?

 

i have the shogun breathers with a ball inside them as the check valves. I ran a hose to the collecter and that was it. No problems.

 

The PCV only really works at idle or other low/no load circumstances. At wot the vac is low enough that contamination isnt an issue, though you could put an angled pipet in the iar stream and depending on it's direction you could see press or vac in the crankcase.

To keep the oil contamination out of the manifold try an inline oil catch.

A simple water trap for pneumatic systems works wonders on many of the Mazdas on MX6.com. Just $2-$5 at any parts store.

Oil in the combustion chamber is a bad thing as it lowers the engines knock resistance but with a well sorted motor (atleast the smaller Mazda ones) the amount of oil that is captured by the trap is tiny, and atleast one member took the time to check the intake for oil so it's safe to say that the amount of oil injested by the motor is miniscule.

 

Good idea but $200 for two breathers!? Are you KIDDING me!?

 

combustable gases in the crankcase? I smell BS! Those gases are contaminated with oil and will only hurt your mielage.


My free flowing exhaust is two moroso spiral flow mufflers and about 3 feet of straight 2.5 inch exhaust pipe.

Like stated before, The PCV only works under no load conditions, the crankcase E-vac works better under load, when your motor needs it most. It is a very simple and effective system.

 

nope i have 2 sets.