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#827998 - 10/04/10 07:01 PM smoking valve covers  
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steve0311 Offline
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Springfield PA
I just replaced my stock valve covers which came with my gm 350 crate engine with after market alluminum ones. the problem is that they wont stop smoking out of the caps for the oil fill hole and the pcv hole. is this problem caused by the fact that i removed my pcv system? if so, how can i either stop the smoke from leaking out, or vent it in a way where the oil doesnt condensate in my engine bay and make everything dirty?

#828004 - 10/04/10 07:17 PM Re: smoking valve covers [Re: steve0311]  
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upflying Offline
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That vapor you see coming out of the valve cover holes is blow by. Blow-by is combustion pressure pushing past the rings and out into the atmosphere. Re-install the PCV system and the blow by will get returned in the combustion chamber and burned.
Is that GM crate engine new?

Last edited by upflying; 10/04/10 07:18 PM.

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#828012 - 10/04/10 07:29 PM Re: smoking valve covers [Re: upflying]  
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steve0311 Offline
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the engine is almost a year old. so wut does the average muscle car that doesnt have a pcv system have the same problem?

#828016 - 10/04/10 07:46 PM Re: smoking valve covers [Re: steve0311]  
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PCV systems were federally mandated in all cars since the early 60's..so muscle cars from that era have them. Some PCV designs are internal so you won't readily see them.
Excessive blow-by could mean a worn engine. A small amount of the vapor is normal but if you are coating your engine bay with vapor residue..that could be excessive.
A cylinder leak down test will tell you if the blow by is caused by a worn engine. This involves screwing a compressed air fitting into the spark plug hole and pressurizing it at TDC. You will be checking to see how long the compressed air is held before dropping.
A year old engine may or may not be worn. Depends on how it was used and maintained..as well as mileage. A lot also depends how good the rebuilder was.

Last edited by upflying; 10/04/10 07:54 PM.

86 MCSS Notchback coupe, LS3, 4L65E, QP 9", Eaton Truetrac, 4 wheel disc, column shift, Dakota Digital, silver with maroon bench interior

#828077 - 10/05/10 12:42 AM Re: smoking valve covers [Re: steve0311]  
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kubihibi Offline
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Originally Posted By: Vince R
the engine is almost a year old. so wut does the average muscle car that doesnt have a pcv system have the same problem?


Yes. It isn't a problem though. It just makes things a little messy sometimes.



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#828129 - 10/05/10 04:05 AM Re: smoking valve covers [Re: kubihibi]  
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Retro Offline
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Aftermarket Valve Covers usually have very poor designed oil Baffles. This can lead to excess oil being sucked through the PCV into engine Intake. Make sure you have a decent Baffle where you place your PCV valve.
You need to have a vent on one Valve Cover & a PCV on the other connected to manifold vacuum. If you seal both Covers the crankcase pressure can blow engine seals such as Front, Rear & Intake F/R & create a real mess.

Last edited by Retro; 10/05/10 04:06 AM.
#828332 - 10/06/10 12:42 PM Re: smoking valve covers [Re: Retro]  
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Slackerzinc Offline
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I have a rpm air gap intake, it has two holes to lifter valley, can I use these for pcv and engine vent instead of drilling my custom valve covers??

#828456 - 10/07/10 01:58 AM Re: smoking valve covers [Re: Slackerzinc]  
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Dand Offline
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You need a pcv valve (positive crank pressure valve) this allows the "blow by" which is pressure building up in the crank case to vent to the intake usually at the carb. In the old days proior to the starting of smog regs. they used a crank case vent tube that blew staigh down to the road (crank case draft tube) it was attached via a port on the bvlock itself. but no more! to much oil vapor under the hood can make a mess and a fire too!!

#828465 - 10/07/10 02:14 AM Re: smoking valve covers [Re: Slackerzinc]  
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kubihibi Offline
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Originally Posted By: Slackerzinc
I have a rpm air gap intake, it has two holes to lifter valley, can I use these for pcv and engine vent instead of drilling my custom valve covers??


Well... yea. The beauty of having a vent and pcv in opposite valve covers is it provides a path for evacuation. Having the pcv next to the vent might not be so good of an idea, if you are picking up what I am putting down.



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#828750 - 10/08/10 03:31 PM Re: smoking valve covers [Re: kubihibi]  
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What about the people who run just breathers? Alota muscle cars I see dont run the pcv.


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#828870 - 10/09/10 01:43 AM Re: smoking valve covers [Re: Mnt86ss]  
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Originally Posted By: Mnt86ss
What about the people who run just breathers? Alota muscle cars I see dont run the pcv.


With no PCV the oil needs to be changed more frequently, as most Race engines do anyway. Water/condensation and combustion by products create acids in the oil which will damage bearings.
PCV may not be able to keep up with Blowby on Race engines setup with loose Piston to Cylinder wall clearance & wider Ring gaps.


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