After a drive and some free revving in the driveway i took the hose off and cut it open, sure enough the entire hose has a coat of oil on the inside. I thought the point of the pcv valve was to filter this **** out? Ive changed the valve twice already.

Im running around 11.6:1 compression on this ls/vtec motor and here's some background https://honda-tech.com/zerothread?id=1165674. I know that high compression=more crackcase pressure so im hoping this is a major player in my oil consumption. I planned to get a catch can asap but people wont pm me back about ordering.

Just wondering how normal this is? The car is consuming oil, so read the other thread for more details/test i did. New rebuild, great compression, exhaust valve steams feel dry...only thing left is Intake valve steam seals, valve guide problem.....or somehow the rings didnt seat.

 

totally normal. the air coming out of the stock baffle still has oil vapor in it and will coat the hose, and continue to dirty the inside of your intake manifold.

you dont need a fancy catch can. its really pointless to route the catch can line back to the IM, run the hose from the PCV to the catch can and plug the IM. also, run the hose from the valve cover to the same catch can and plug the air intake. that way absolutely NO oil vapor goes back into the IM and engine, dirtying your throttle body, manifold, head and valves.

 

well the reason id want to route it back to the IM is to keep a vacume on it vs letting it vent.

 

well, why do you want vacuum? is it really the point of a catch can to PULL oil out of the engine, or just have a place to dump the dirty oil that is puked out of the crankcase than contaminate the rest of your engine. think about it...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tyson &raquo;</TD></TR><TR><TD CLASS="quote">well, why do you want vacuum? is it really the point of a catch can to PULL oil out of the engine, or just have a place to dump the dirty oil that is puked out of the crankcase than contaminate the rest of your engine. think about it...</TD></TR></TABLE>

I totally agree w/ you but, the honda engineeers put 2 ports(on most engines) w/ positive crankcase ventilaton (vacum) for a reason. For most of us, I feel that "vacum" to the breather ports is not needed/wanted due to "puke" being recirculated. If I were to use a vehicle for commuting purposes only w/ no modifications I would leave the OE ventilation system in place. Just my $.02.

Phil

 

well this isnt my DD, and its not stock compression soo id want vacuum to pull that **** out of the crankcase correct?

 

the way the system is designed is to allow fresh air to come in through the valve cover as air is being pulled out of the back of the crankcase. but when you have a lot of blowby or are really pushing the engine, engine pressure will push out of both the crankcase and valvecover.

but you dont need the fresh air and you dont need the vacuum to pull it out. youll be pushing out the engine pressure naturally, without any extra help. and you dont want to dump it into the intake manifold, which also lowers octane.

really, its not needed.

 

so basically i get a greddy catch can and run from the pcv VALVE to it, and from the valve cover to it, and plug the manifold port. what would happen if i removed the PCV valve and ran open hose from the black box to the catch can.

 

PCV valve is just a one way valve. it prevents intake air from going directly into the crankcase. also, when the engine is off, itll remain closed. other than that, its nothing different by not putting it in, especially if its no longer connected to the intake manifold.

some engine builders dont bother with the crankcase at all and remove the external baffle and plug the crankcase instead. they just use the valve cover port to expell the blowby into a catch can.

recirculating the crankcase ventilation is all just an environmental thing.

 

ok well answer me this, i just went to home depot and picked up soem of that clear braided hose, i put it inbetween the pcv valve and IM right there in the parking lot. Drove home about 15miles, i got on the car a few times, drove the car normal a few times etc etc.

I get home pop the hood and a puddle of oil has collected in the hose, id say a good 5-10 "drops"+whatever is coated on the entire hose.

When i rev the motor the puddle moves up the hose closer to the IM, now should that much oil collect in that hose in 15miles? I dont think so.

Also you say the valve cover breather should be sucking in at idel/low pressure? Mine seems to blow out at idel little puffs(not smoke). You can feel it on your hand, also when i dissconnect the pcv valve completely at idel my valve cover breather hose puffs smoke when i rev it, then no smoke with the pcv valve connected. I was assumeing that it meant its doing its job....but im open ears.

TIA

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JETSWU87 &raquo;</TD></TR><TR><TD CLASS="quote">
I get home pop the hood and a puddle of oil has collected in the hose, id say a good 5-10 "drops"+whatever is coated on the entire hose.

When i rev the motor the puddle moves up the hose closer to the IM, now should that much oil collect in that hose in 15miles? I dont think so.
</TD></TR></TABLE>

seems like a lot of oil to me. somethings up with that.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JETSWU87 &raquo;</TD></TR><TR><TD CLASS="quote">Also you say the valve cover breather should be sucking in at idel/low pressure? Mine seems to blow out at idel little puffs(not smoke). You can feel it on your hand, also when i dissconnect the pcv valve completely at idel my valve cover breather hose puffs smoke when i rev it, then no smoke with the pcv valve connected. I was assumeing that it meant its doing its job....but im open ears.

TIA</TD></TR></TABLE>

sorry, cant tell you where to smoke is really coming from. seems like blow by to me. if you connect the PCV hose to the intake manifold, thats just recirculating into your engine then.

im actually not familiar with high compression engines. not sure whats normal.

the little air puffing in and out from the valve cover is normal tho. moving pistons and rocker arms and what not are causing cyclical volume changes.


Modified by Tyson at 4:52 PM 3/10/2005

 

i see, i guess ill know when i get my catch can if my oil consumption tones down.