Anybody know anything about this? Greddy Related
Thread Starter
Registered User
Joined: Mar 2003
Posts: 178
Likes: 0
From: Santa Clarita, CA
Anybody know anything about this? Greddy Related
http://www.i-m-racing.com/gredoilcatta.html
It looks huge in the picture but i guess it goes under your hood and keeps it clean...whats the info on this?
It looks huge in the picture but i guess it goes under your hood and keeps it clean...whats the info on this?
Your piston rings do not seal 100% of the combustion pressure in the cylinders. The rest of the pressure that seaps past the rings enters the crankcase, which is the area in your block where the oil sits and the crankshaft resides, etc.
This pressure entering the crankcase needs to be vented or wierd things happen like your oil dipstick shooting out, etc.
So typically manufacturers put a opening in the valvecover. The reason the valvecover is cause its higher up (no liquid oil escape) and less oil windage going on, and just easier to get to. Meaning oil isnt really flinging around under the valvecover much. The pressure makes its way under the valvecover through the oil drainback passages where the oil in the heads drain back into the block.
The opening in the valvecover is called the PCV valve. There is a little ball check-valve in there. So when the engine is under vacuum it sucks the ball over and the valve is open, under full throttle which is 0 vacuum (or boost in a forced induction car), the boost or gravity holds the ball down sealing the valve. So under vacuum these oily gases are feed through the PCV valve into your intake system.
This is just regular emmissions stuff. You have seen many people get rid of this by putting a mini air filter on their valvecovers venting these gases to the atmosphere rather then their intake. The point of this catchcan is to keep the PCV system intact, only the can is supposed to catch any liquid oil that makes it through the valve and hold it in the can rather then let it run into the intake and burn.
This is a cool idea... however you brand new engine should have rings that are sealing very well and the ammount of oil comming through will have no disadvantage that will see for a very long time. Older engines push more through the PCV as the rings wear and then you will start getting a thick oil film in your intake, and start seeing oil burn out the exhaust. This is not nearly the only thing that can make burnt oil come out your exhaust tho, so dont think you can just disconnect the PCV on your beater car to stop it from burning so much oil.
All in all, i think the catchcan is stupid. I would rather just vent the PCV to the atmosphere and spend less and weigh less and have a less complicated looking engine bay.
-Charles
This pressure entering the crankcase needs to be vented or wierd things happen like your oil dipstick shooting out, etc.
So typically manufacturers put a opening in the valvecover. The reason the valvecover is cause its higher up (no liquid oil escape) and less oil windage going on, and just easier to get to. Meaning oil isnt really flinging around under the valvecover much. The pressure makes its way under the valvecover through the oil drainback passages where the oil in the heads drain back into the block.
The opening in the valvecover is called the PCV valve. There is a little ball check-valve in there. So when the engine is under vacuum it sucks the ball over and the valve is open, under full throttle which is 0 vacuum (or boost in a forced induction car), the boost or gravity holds the ball down sealing the valve. So under vacuum these oily gases are feed through the PCV valve into your intake system.
This is just regular emmissions stuff. You have seen many people get rid of this by putting a mini air filter on their valvecovers venting these gases to the atmosphere rather then their intake. The point of this catchcan is to keep the PCV system intact, only the can is supposed to catch any liquid oil that makes it through the valve and hold it in the can rather then let it run into the intake and burn.
This is a cool idea... however you brand new engine should have rings that are sealing very well and the ammount of oil comming through will have no disadvantage that will see for a very long time. Older engines push more through the PCV as the rings wear and then you will start getting a thick oil film in your intake, and start seeing oil burn out the exhaust. This is not nearly the only thing that can make burnt oil come out your exhaust tho, so dont think you can just disconnect the PCV on your beater car to stop it from burning so much oil.
All in all, i think the catchcan is stupid. I would rather just vent the PCV to the atmosphere and spend less and weigh less and have a less complicated looking engine bay.
-Charles
Thread
Thread Starter
Forum
Replies
Last Post