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Old 04-30-2007, 11:37 AM
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Valve cover Oil leak problem / PCV system question

Okay, hereís my problem.

The camaro keeps wanting to spit oil all over. After I shut it off, oil runs down pass. Side of the block, down the pan and drips from the oil drain plug. Seems to be coming from both the back corner of the valve cover and from the PCV area. I think I have the valve cover sealed up for now. For the PCV, I have a Moroso oil separator (evac. System type deal) and then a PCV is coupled to the nipple on the separator (with short piece of hose), then the PCV hose ran to the carb vac port. I also have one of those baffled style rubber grommets in the valve cover, with a sheet metal shield that is fastened to the inside of the valve cover and sits about an 1/8Ē away from the opening on the baffled grommet Ė all in a thought to keep oil from getting into the separator and leaking onto the valve cover, header, starter, block, bellhousing, tranny, etc, etc. etc. The other valve cover has the baffled grommet and a regular Moroso chrome breather.

If you canít tell, Iím getting a little frustrated. It seems strange that I could be getting such a volume of oil from the oil separator.

What in the heck do I have to do to get the oil to stop leaking??? Or perhaps how to seal the Moroso oil separator so that the oil doesnít leak out of the bottom of the crimped-construction chamber? Or something else that works better? Kind of trying to get a homegrown solution, but Iíll consider other options, too.

Do I just need a oil tank with a PCV on top and just run a big hose to it from the valve cover?

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Last edited by hotrodf1; 05-01-2007 at 01:29 PM. Reason: i can't speel valve
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Old 04-30-2007, 05:21 PM
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Is this problem after racing, or a street engine? I suspect I know but I'd like to hear it from the horses mouth so to speak.

How's the engine set up, high volume pump, dry sump? Bearing clearances wide or "factory"? Upper end flow restrictors, or not? Piston to wall clearance? Type of rings; width, gap type and amount? Typical RPM peak and for how long? Drain back restrictions or breather pipes standing up in the valley?

Bogie
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Old 05-01-2007, 06:23 AM
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This motor is way simpler than you think.

Just a street motor, 6800RPM max, briefly before I grab the next gear. Seems to do it worse after I've been running it hard which makes sense. No oil restrictors intalled its a hyd roller cam. I do have a crank scraper installed, but no windage tray because I don't have studs.

Rings are Hastings plasma moly I think. Gapped to hastings spec, don't honestly remember what it was. This is really the first motor that I built myself, and I still have a lot to learn. Guess there always will be something to learn for that matter. . .

Don't remember the spec on the piston to wall, but they are forged pistons, machine shop set the bores to proper size I guess. had new crank, new rods, put standard size chamfered H bearings in it.
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Old 05-01-2007, 10:00 AM
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Yeah, when you stop leaning about these things let us know as we're all looking for an expert. After nearly 60 years of building, I still feel like a kid when one I just built fires for the first time.

At 6800 RPM there's a lot of oil in there being thrown everywhere. A windage tray would help get it out of suspension and back into the pan. A good screen style like Moroso would do you fine.

At high RPMs say over 5500, there is a lot of pumping in the crankcase, remember that the same displacement pumped in and out of the cylinders is also pumped back and forth inside the crankcase.

So the big problem at high speed is to separate the oil from the atmosphere being pumped about the inside of the engine. This requires large passages to slow the speed of the atmosphere so oil will separate and settle. Often this means a separate settling (puke) tank where the engine's vapors can slow and let the oil separate.

Bogie
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Old 05-01-2007, 01:27 PM
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Quote:
Originally Posted by oldbogie
Yeah, when you stop leaning about these things let us know as we're all looking for an expert. After nearly 60 years of building, I still feel like a kid when one I just built fires for the first time.

At 6800 RPM there's a lot of oil in there being thrown everywhere. A windage tray would help get it out of suspension and back into the pan. A good screen style like Moroso would do you fine.

At high RPMs say over 5500, there is a lot of pumping in the crankcase, remember that the same displacement pumped in and out of the cylinders is also pumped back and forth inside the crankcase.

So the big problem at high speed is to separate the oil from the atmosphere being pumped about the inside of the engine. This requires large passages to slow the speed of the atmosphere so oil will separate and settle. Often this means a separate settling (puke) tank where the engine's vapors can slow and let the oil separate.

Bogie
That's kind of what i've been imagining too. I guess I could use a regular PCV valve in the normal location, and then run the hose to a separating cansiter of some sort and then run the hose to the carb?

I suppose there are some commercially available cansisters as well. I wonder how much and where to get?

If I had $$$ I would just get a vacuum pump. Yeah baby!
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Old 05-01-2007, 02:11 PM
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My 350 camaro is having the exact same problem! Its VERY frustrating! the oil is running over everything and burning off the headers and its coming out of the pcv valve {right at the gromet} and the corner of the valve cover. I pretty well have the valve cover leak stopped as well but no luck with the pcv. My car is off the road now though due to other engine problems. Hope you get yours fixed! I will continue to look at the suggestions here.

steve
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Old 05-01-2007, 02:40 PM
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Quote:
Originally Posted by steveyb4342
My 350 camaro is having the exact same problem! Its VERY frustrating! the oil is running over everything and burning off the headers and its coming out of the pcv valve {right at the gromet} and the corner of the valve cover. I pretty well have the valve cover leak stopped as well but no luck with the pcv. My car is off the road now though due to other engine problems. Hope you get yours fixed! I will continue to look at the suggestions here.

steve
LOL. I'm sure there are countless others having the same problem.

here's a sug. for ya. Put a sock on it! my neighbor used to run a LS-6 chevelle at the track and that's what he did! Not exactly bling bling eh??

Not to mention a fire hazard. try passing tech with that!

I think Im gonna find a low cost solution. I once made a radiator puke tank from 3" PVC pipe and end caps. Sanded it pretty good and sprayed it with paint and it looks pretty decent. I'm thinking maybe something along those lines with some sort of baffling inside. . . .

hmmmm
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Old 05-01-2007, 02:44 PM
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Yea I dunno whats gonna happen, first I have to do a mild rebuild on it anyways so ill have to look for solutions as I do it.

Steve
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