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#1047511 - 01/25/17 01:07 PM vacuum pump for crankcase ventilation  
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s10mike Offline
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s10mike  Offline
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herminie, pa
Hi everyone, I have been having a problem with the built ls1 in my monte carlo. my pcv system draws a lot of oil into the intake manifold, this is actually really common with LS1s and there are a few different solutions. But anyway, the one option I was considering was to use either a mechanical/ electric driven vaccum or air pump for the purpose of crankcase evacuation. Just wondering if anyone has any success with a set up like this. I've heard of people using factory smog pumps to draw air through the crankcase, but most people say that set ups like this have a short life becuase air pumps were never meant to pump oil vapor. I guess it's hard on the pump vanes


86 monte carlo ss
6.0 ls/4l80e dana 60
#1047513 - 01/25/17 01:57 PM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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SSLance Online content
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SSLance  Online Content
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Peoria, AZ
I have been planning on adding a crankcase vacuum pump to my car as well, only for a different reason...so I'm interested to see what others have used successfully. My engine is not an LS but with the type of racing that I do I'm either WOT or completely off the gas under brake over and over again and the current PVC system can not keep vacuum on the crankcase under these conditions.

So lets hear it guys, what have you used for a crank case vacuum pump and how does or did it work out?


Lance
1985 Monte Carlo SS Street Car
#1047522 - 01/25/17 04:49 PM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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DLV555 Offline
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DLV555  Offline
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Findlay, OH USA
You could try an oil separator. That way you could plumb it to drain the oil back into the crankcase. Just a thought.


'87 Monte Carlo SS, 400 SBC, 800 Q-Jet, Edelbrock RPM Q-Jet intake, Howards BM Rattler cam, Flowtech headers, 200-4R w/shift kit, 4.10 posi, 2.5" exhaust, DeltaFlow 40s
'73 Mercury Montego, 460 BBF, AirGap Intake, 800 Q-Jet, Voodoo cam, C6, 9" 3.25 posi, 3" exh, Flowmaster 40s
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#1047529 - 01/25/17 07:12 PM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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mmc427ss Online content
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mmc427ss  Online Content
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Pottstown, Pa
On an old SBC it's important to have valve covers that have good baffling at the PVC opening, and the fresh air valve cover opening in the other valve cover. Many of the latest pretty covers have poor, or no baffling for the PVC. Even the GM high dollar valve covers don't have adequate baffles, actually very poor, just a piece of alum screwed across the port. I spend big dollars for custom made fabricated covers, they had no baffling. One of the reasons for no baffles is when running some rockers they will hit the baffles. I fabricated a narrower baffle to mimic GMs baffle used on every SBC for 50 years,and had them welded in. No oil control problems through the PVC.

Lance check the hose running from the PVC to the carb, should show no signs of oil coming out of the PVC. Also use an AC Delco PVC, CV774C, I've had issues with off brands, only use the Delco PVC.

As far as an LS engine PVC issues, no experience with them. But there is info on this forum were that problem was addressed. Just don't have time to dig it up right now, later tonight.
Bob

#1047540 - 01/26/17 04:10 AM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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The PC Surgeon Offline
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Salisbury Mills, NY
I added an oil separator to control any blow by/crankcase pressure at WOT. There is a petcock valve at the bottom to drain any oil. I would monitor this under varying conditions and usually during WOT conditions, I have some oil in the container. About a table spoon or two at most. This prevented the oil coming directly from my valve cover breathers and blasting all over the covers and firewall. Instead of a breather on the separator, you can plumb back into the back of the carb, as it is now.
HTH

#1047542 - 01/26/17 04:26 AM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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mmc427ss Online content
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mmc427ss  Online Content
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Hi Ben.
Does the capture tank have vac applied to it?
Bob

#1047543 - 01/26/17 04:29 AM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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The PC Surgeon Offline
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The PC Surgeon  Offline
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Salisbury Mills, NY
Hey Bob,
No, just crankcase pressure. My motor make only 10 inches of vacuum. Just enough to keep the brake booster pressurized. Any less and I would have to add a vacuum pump.

#1047544 - 01/26/17 04:38 AM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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mmc427ss Online content
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mmc427ss  Online Content
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#1047548 - 01/26/17 01:22 PM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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Travis Jones Offline
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Travis Jones  Offline
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Ferndale, MI
Not MCSS related but LS related.

My Fiance has a 2015 Camaro SS 1LE and it came with a factory oil separator kit pn 12653073 in the trunk when we bought it.

We install that when she takes the car to the track, we also installed a "clean side" oil catch can to keep oil vapor from re-entering the intake tract. http://www.phastekperformance.com/2010-2...h-can-85487.htm

We have had zero issues with oil control. After a track day there is about a 1 table spoon of oil in the clean side, the "dirty" side drains back through the oil cap hole.


86 SS 6.2l LS3, Ilmor intake, Summit Stage 4 Cam, Stainless long tube headers, Stainless 3in exhaust, Tremec T-56 Magnum 6 speed, Eaton Truetrac 8.8 LSD, UMI Cornermax Front Suspension, 3-link Rear suspension w/ UMI Control Arms, UMI Front & Rear Braces, Brembo Brakes
#1047549 - 01/26/17 01:31 PM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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The PC Surgeon Offline
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The PC Surgeon  Offline
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Salisbury Mills, NY
Bob and Pezking,
Same principle. If it's a stock motor, the stock EGR valves are best. But if it's a built motor, some experimentation is required with spring weight ( to regulate crank case ventilation flow through the crankcase breather). When I changed my valve stem seals to Viton valve stem seals, I also noticed less oil in the separator. Far less.

#1047554 - 01/26/17 03:41 PM Re: vacuum pump for crankcase ventilation [Re: The PC Surgeon]  
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Travis Jones Offline
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Travis Jones  Offline
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Ferndale, MI
Originally Posted By: The PC Surgeon
Bob and Pezking,
Same principle. If it's a stock motor, the stock EGR valves are best. But if it's a built motor, some experimentation is required with spring weight ( to regulate crank case ventilation flow through the crankcase breather). When I changed my valve stem seals to Viton valve stem seals, I also noticed less oil in the separator. Far less.


Well considering this is half of the factory PCV system for a car designed to spends its days singing at high RPM around a track, and an improvement on a simple pass through hose from the valley pan to the intake manifold (something BBC and Gen I SBC's dont have) It's generally accepted as one of the better systems on the GM LS platform for high RPM oil control.


86 SS 6.2l LS3, Ilmor intake, Summit Stage 4 Cam, Stainless long tube headers, Stainless 3in exhaust, Tremec T-56 Magnum 6 speed, Eaton Truetrac 8.8 LSD, UMI Cornermax Front Suspension, 3-link Rear suspension w/ UMI Control Arms, UMI Front & Rear Braces, Brembo Brakes
#1047558 - 01/26/17 06:18 PM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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s10mike Offline
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s10mike  Offline
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herminie, pa
Thanks everyone, there has been a lot of great discussion and information in this thread so far!


86 monte carlo ss
6.0 ls/4l80e dana 60
#1047685 - 01/31/17 02:30 PM Re: vacuum pump for crankcase ventilation [Re: s10mike]  
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Nycore Offline
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Nycore  Offline
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NYC
I agree with the oil catch can, solves the issue. The vac pumps do work but usually thats only necessary for a high boost setup. I use a home made oil separator / catch can on a procharged small block. The can let's the oil vapor settle and collect and your pcv system does the work. Less parts and functional.

My setup has a sealed catch can with no breather on it. One valve cover has a breather and the opposite side valve cover goes into the CAN and into the rear of the carb. Intake makes the vacuum, sucks in through the catch can, that sucks from the valve cover, clean air comes in opposite side valve cover if needed.


86 SS, 383 stroker with D1SC helical Procharger, intercooled, modified 200r4, 3:89 Ford 9", meth injection, C&S 850 blow through carb, msd 6btm ignition box, ET Street slicks.

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