PCV Help
Thread Starter
Safety Car
Joined: Nov 2005
Posts: 3,960
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From: Lompoc, CA. Santa Barbara County
PCV Help
Here is a picture of my engine. As you can see, I have a PCV valve on the back of my passenger side valve cover and a breather on the driver's side valve cover. I have to tape the lower half of the breather or I'll douse my engine in oil. The valve covers have no baffles. I pulled the breather and held my hand over the hole while the car idled for about a minute. When I removed my hand, a whoosh of air came out of the valve cover. I have positive crankcase pressure at idle. This engine is getting tired and I shouldn't have used molly rings when I honed and rebuilt. Forged pistons are a little loose too. But I was thinking of putting a second PCV valve on the driver's side valve cover. Has anyone done this? Will it help? Do I have a problem?
Bee Jay
Bee Jay
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Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
I really did like your 1/2 drive battery powered impact wrench present for Christmas. It sure makes those wheel changes at the track easier!
If I had your money and wanted to pickup some cheap extra HP. I would get an electric vacuum pump.
If I had your money and wanted to pickup some cheap extra HP. I would get an electric vacuum pump.
Thread Starter
Safety Car
Joined: Nov 2005
Posts: 3,960
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From: Lompoc, CA. Santa Barbara County
Bee Jay
Thread Starter
Safety Car
Joined: Nov 2005
Posts: 3,960
Likes: 572
From: Lompoc, CA. Santa Barbara County
How much HP does an electric vacuum pump make? Is it used a lot on track vehicles?
I can't add anything else electric until I upgrade my alternator.
Bee Jay
Last edited by Bee Jay; Jan 21, 2010 at 03:32 PM.
Safety Car
Joined: Aug 2000
Posts: 3,711
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From: San Antonio TX
Obviously better cylinder sealing would help, but a more effective breather (one with a baffle) would help a lot right now.
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Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Here is a good explanation only it's for LS motors.
http://www.gzmotorsports.com/LSXVPK.html
Most race cars have a similar setup as to what is shown down the page of the complete front motor view. Not cheap, but very functional. Call them and have then give a kit quote and then call summit tech support and give them the kit part number and get a quote.
http://www.moroso.com/catalog/catego...?catcode=17200
Yes, I really do use the Dewalt 1/2 inch to change tires at the track without a recharge Street to race and back to the streets to drive home
http://www.gzmotorsports.com/LSXVPK.html
Most race cars have a similar setup as to what is shown down the page of the complete front motor view. Not cheap, but very functional. Call them and have then give a kit quote and then call summit tech support and give them the kit part number and get a quote.
http://www.moroso.com/catalog/catego...?catcode=17200
Yes, I really do use the Dewalt 1/2 inch to change tires at the track without a recharge Street to race and back to the streets to drive home
Last edited by gkull; Jan 21, 2010 at 04:10 PM.
Team Owner
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From: Crossville TN
For best results, the PCV valve should be on the driver's side and the breather on the passenger side. If the breather still leaks, it is because you have no baffles under the connections for the breather and/or the PCV valve. You really need baffles under those areas to keep oil splash from hitting those components directly. You can run a tube from the breather hole to someplace on the air cleaner (to eliminate the breather and any oil vapor problem in the engine compartment), but the inlet fitting to the valve cover must be baffled.
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Yea make sure that is a PCV valve you have there on the passenger side
I have seen breathers ( just bought one ) that look exactly like from the top that have no pcv inside, it is a breather and it is supposed to connect to the air cleaner.
And they have one that looks exactly the same from the top and it has a PCV inside. I know you probably already checked this but some times things slip by
I have seen breathers ( just bought one ) that look exactly like from the top that have no pcv inside, it is a breather and it is supposed to connect to the air cleaner.
And they have one that looks exactly the same from the top and it has a PCV inside. I know you probably already checked this but some times things slip by
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
For best results, the PCV valve should be on the driver's side and the breather on the passenger side. If the breather still leaks, it is because you have no baffles under the connections for the breather and/or the PCV valve. You really need baffles under those areas to keep oil splash from hitting those components directly. You can run a tube from the breather hole to someplace on the air cleaner (to eliminate the breather and any oil vapor problem in the engine compartment), but the inlet fitting to the valve cover must be baffled.
Thread Starter
Safety Car
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From: Lompoc, CA. Santa Barbara County
Bee Jay
Safety Car
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From: Oakland California
Have you tried using a regular PCV, I had a PCV like the one you have on your vette and they don't really last long. I went with, I believe it was a '97 Suburban, PCV on mine and haven't had any problem.
.
Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
So you are positive that there is PCV valve in there, never heard or PCV breather seems that would be defeating the purpose of attaching a manifold vacuum line to it ? Why not get a $3 stock PCV and see if your problem goes away ?
Last edited by MotorHead; Jan 21, 2010 at 08:23 PM.
Instructor
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From: Omaha ne
"I pulled the breather and held my hand over the hole while the car idled for about a minute. When I removed my hand, a whoosh of air came out of the valve cover. I have positive crankcase pressure at idle. "
There in lies you answer, you have excess crankcase pressure, probabaly due to weak rings. No quick and dirty fix, Sorry
There in lies you answer, you have excess crankcase pressure, probabaly due to weak rings. No quick and dirty fix, Sorry
Melting Slicks
Joined: Mar 2008
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From: Meriden CT
Thread Starter
Safety Car
Joined: Nov 2005
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From: Lompoc, CA. Santa Barbara County
Kwplot suggested that this would help my oil leaking out of the breather problem:
So, I gathered a few materials this evening:
1/4" bolts, aluminum tubing, and some aluminum sheeting. Then I built this:
This is what I see thru the breather hole now:
It's late, and I have to go to Sacramento for the weekend. I'll start and drive the car next week and let everyone know how it worked out.
Bee Jay
So, I gathered a few materials this evening:
1/4" bolts, aluminum tubing, and some aluminum sheeting. Then I built this:
This is what I see thru the breather hole now:
It's late, and I have to go to Sacramento for the weekend. I'll start and drive the car next week and let everyone know how it worked out.
Bee Jay
Team Owner
Joined: Apr 1999
Posts: 21,953
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
That aint gunna help! oil mist filled blow by vapor pressure at wide open throttle and neither is additional PVC lines that don't function at low manifold vacuum.
Older race cars that are not allowed to fancy modern vacuum pumps resort to large diameter lines to a remote vented puke can.
Or how about a drain back vent cover.
http://www.moroso.com/catalog/catego...?catcode=38103
Older race cars that are not allowed to fancy modern vacuum pumps resort to large diameter lines to a remote vented puke can.
Or how about a drain back vent cover.
http://www.moroso.com/catalog/catego...?catcode=38103
Safety Car
Joined: Oct 2007
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From: Austin Texas
Corvette of the Year Winner 2017
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you should use a valve cover with a baffle built in, a PVC is standard on drivers side.
Those open element K&N breathers always throw oil mist into the engine compartment.
Easy fix, cut off a sock top, and keep that over the K&N breather, change it as needed.
69VETT
Those open element K&N breathers always throw oil mist into the engine compartment.
Easy fix, cut off a sock top, and keep that over the K&N breather, change it as needed.
69VETT