Lets talk about Crankcase evacuation
Thread Starter
Safety Car
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From: Charles Town WV
Lets talk about Crankcase evacuation
This thread was started so that we didn't hijack another thread. You can read the previous posts at: http://forums.corvetteforum.com/showthread.php?t=898350
My engine has been smoking and leaking oil like crazy since I've owned it, and I'm wondering if I need more than just the standard PCV system. I ran a leakdown and compression test today, and I'm looking good.
Olivier, can you post some pictures of your crankcase evac system? How did you weld the tubes into the collectors on the sidepipes without having them show? Did you do it yourself or did you have it done?
BTW, I can't believe those pumps are $360, that's insane. I'd like some pictures of how those mount if you have any. The drive system for them looked interested, it looks like a piece that sticks out and drives it from the harmonic balancer.
My engine has been smoking and leaking oil like crazy since I've owned it, and I'm wondering if I need more than just the standard PCV system. I ran a leakdown and compression test today, and I'm looking good.
Olivier, can you post some pictures of your crankcase evac system? How did you weld the tubes into the collectors on the sidepipes without having them show? Did you do it yourself or did you have it done?
BTW, I can't believe those pumps are $360, that's insane. I'd like some pictures of how those mount if you have any. The drive system for them looked interested, it looks like a piece that sticks out and drives it from the harmonic balancer.
Team Owner
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
I'm going to look up the pics.. I didn't do the install myself because it involves welding.. I had Van Steel weld the tubes into the pipes.. They charged my like $40 to weld the tubes into the pipes and for the hose to connect the tube on the pipes to the breathers..
I'll post pics as soon as I find them..
I'll post pics as soon as I find them..
Team Owner
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Here are the pics of the system..
BTW - my total cost was less than $100 including the labor to weld the tubes into the headers.. The system is not visible unless you look under the pipes...
BTW - my total cost was less than $100 including the labor to weld the tubes into the headers.. The system is not visible unless you look under the pipes...
Last edited by GrandSportC3; Sep 6, 2004 at 03:03 PM.
Thread Starter
Safety Car
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From: Charles Town WV
That's pretty clean. I think I'm going to go with the pump though. Call me crazy, but I'm going to avoid any welding to my jet-hotted pipes.
I need to read up on the pump evac system. I'm curious where it puts the oil vapor from the crank case. I'm assuming it feeds it back to the pcv port on the carb somehow.
I need to read up on the pump evac system. I'm curious where it puts the oil vapor from the crank case. I'm assuming it feeds it back to the pcv port on the carb somehow.
Race Director
Joined: Dec 1999
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I've had a heder evac system for a long time, always worked perfectly, here's the same thing on my new buildup (I will remove the cutouts, will weld a bung for the valves to screw in on the new system), it's the thing with the orangle plug on it:
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Team Owner
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Originally Posted by tshort
Steve,
I think the pump pumps the oil to a container. You then have to drain the container every once in a while.
I think the pump pumps the oil to a container. You then have to drain the container every once in a while.
Team Owner
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Originally Posted by Steve Straus
I wonder if I can use an OEM smog pump as a vaccuum pump? Not quite as trick looking, but if it works....
Team Owner
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Originally Posted by gdh
I like Olivier's setup over the pump, just one less thing to worry about and it looks very clean.
Melting Slicks
Joined: May 2001
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From: May help you? You can sure as hell try!
Unless you've got an all out race motor I don't see why an evacuation system would be necessary. Sounds like you're band-aiding another problem. Are you seeing any signs of excessive oil being blown out through either the PCV lines or where the fresh air tube connects to the air cleaner. I've seen leak down/compression tests be completely misleading when it comes to the actual blow-by levels that the engine produces while running. Just a reminder to be sure to cover all the basics before moving on to the more compicated (and expensive) solutions.
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From: Charles Town WV
Originally Posted by GrandSportC3
Don't forget that you need to run without mufflers for the system to work.. As soon as there is backpressure - it won't work..
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Originally Posted by LemansBlue68
Unless you've got an all out race motor I don't see why an evacuation system would be necessary. Sounds like you're band-aiding another problem. Are you seeing any signs of excessive oil being blown out through either the PCV lines or where the fresh air tube connects to the air cleaner. I've seen leak down/compression tests be completely misleading when it comes to the actual blow-by levels that the engine produces while running. Just a reminder to be sure to cover all the basics before moving on to the more compicated (and expensive) solutions.
Team Owner
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From: Lakeland, FL
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St. Jude Donor '03, '06, '17
Originally Posted by Steve Straus
Even with spiral baffles?
Thread Starter
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From: Charles Town WV
I know I brought this up already, but does anyone know how much vacuum a smog pump pulls? I've been reading that a some racers have hooked up smog pumps to a breather to evacuate the crankcase. If I hooked the outlet to a moroso evac container that might work for me until I can afford to go with the real mccoy.
Lemans: Yes, I have oil leaking out of the dipstick. I've tried everything at this point. I have a more radical cam in this engine than any I've had in the past. I've never had problems like this before, so I'm trying something new.
Lemans: Yes, I have oil leaking out of the dipstick. I've tried everything at this point. I have a more radical cam in this engine than any I've had in the past. I've never had problems like this before, so I'm trying something new.
Drifting
Joined: Sep 2003
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From: FRANKLIN GA
You know I'm probably wrong on this but doesn't a smog pump... pump air and not suck it.
If you could get it to turn the opposite way it might suck.... but then where would the oil that it sucked go? out the intake wherever that is? They only have one pipe coming from them.
If you could get it to turn the opposite way it might suck.... but then where would the oil that it sucked go? out the intake wherever that is? They only have one pipe coming from them.
Thread Starter
Safety Car
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From: Charles Town WV
Originally Posted by EDDIEJ82
You know I'm probably wrong on this but doesn't a smog pump... pump air and not suck it.
If you could get it to turn the opposite way it might suck.... but then where would the oil that it sucked go? out the intake wherever that is? They only have one pipe coming from them.
If you could get it to turn the opposite way it might suck.... but then where would the oil that it sucked go? out the intake wherever that is? They only have one pipe coming from them.
This system is a little more affordable than the Moroso though...
http://www.candsspecialties.com/store/html/pumppan.html
Race Director
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From: Waterloo ontario Canada
What's so wrong with a PCV valve in one head and in the other a line running to the air cleaner element?? That is the standard hookup and it works. I never see oil vapors or leaking over the valve covers.
Running open side pipes is just too loud, I value my hearing and don't want to annoy everyone within a mile of me.
Running open side pipes is just too loud, I value my hearing and don't want to annoy everyone within a mile of me.