Do you have one? Pictures? How do you keep it from filling?

'90 LT-5 was assembled without valve stem seals, and I got an oil burn at startup that has always bothered me.

Even after 10 minutes restart, I get the blue puff.

BESIDES that, PCV pull a LOT of oil.

When I did top end rebuild, I pulled the TB after half dozen Closed Loop idles, and saw a pool of oil inside plenum, at the PCV-to-plenum inlet (Yellow Circle). I wouldn't have believed how much oil PCV pulls otherwise.

So ideally, the PCV inlet should be routed in FRONT of air filter, NOT behind TB. But how to maintain vacuum? How to seal the hose???

Otherwise, an oil catch can for LT-5 would need a drain valve, opened when motor is OFF, that would allow the oil to drain BACK to crankcase. Motor vacuum would keep the valve closed for proper operation while running.

Thoughts? Ideas?

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Shrader

I don't have one but here's a thought. Between the can and the oil pan have a electrically controlled valve. Wire it up with a relay that's energized when the engine starts or the ignition is turned on and closes the valve. Have it so it's open when not energized. If anything is in the can it would run back in the oil pan when the ignition is off.

Just some thoughts.

Paul

THat's it - an EGR Solenoid Valve - diverts vacuum for EGR Duty Cycle!!!

Now - how to route oil drain BACK to the pan?

Or to the port in the valve cover??????????

Since you asked for thoughts...I think you're over thinking it. What's wrong with a simple catch can that you drain manually?

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Not knowing how high they have to be, maybe drill a hole in the oil pan and weld a bung on it to attach a 'return hose' to?

I remember some type of preoiling system years back that an acquaintenance had on a high perf engine. It filled a small container with oil while running and he had some type of a switch he worked before starting the engine. When the switch was worked, the oil in the container was dumped into the top end of the engine somewhere, in essence prelubing the top end. Basic principle sounds similar to what you're trying other than the source of the oil. Maybe check boat supply shops for your parts?

Great timing. I was just asking about that

Of course a supercharger complicates matters for me.

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Found a little blurb on preoilers here:
http://www.pre-lube-it-or-lose-it.com/how_it_works.html

Just to explain maybe a little more of what I was saying, it does kind of sound similar in basic operation. Biggest difference I see is where you get the oil from in the first place that goes into the can.

Pre-oiler

That's in part what I use my accusump for

Got to love having oil pressure before you start the engine

It's being pulled through twin PCV lines hc - and it's a LOT of oil. I got syn 30 weight, and lighter oil more readily pulls into the PCV than 40 weight.

Matt - it's really too much oil to have it not dump automatically somehow. You'd be surprised to see the volume.

Designers likely had it in mind for extra protection, for the record-setting run in '90.

Brian - are the 2 cans in parallel (doesn't look like they're in series at all there). Or are they completely separate? Hard to tell by the diagram there...



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Right 2 cans

One is for the pressure side, which you're not interested

The other is routed into the stock loop.

Here's a thread specifically on LT5's

http://www.corvetteforum.com/forums/c ... 5-eliminated-systems.html

Still wracking my brain on this (yeah - all 2 brain cells)...

First mock-up - trial / error, I'm looking at this right now:

(I really want to have some polycarbonate cylindrical tubing - that would be ideal. Looking around now)

Anyway, with the plastic jar CUT at a 'ring', they 'slip-jointed back together. They WILL seal.

Some Scotch-Brite, cut for the cylinder, not YET sealed. Probably go with RTV around the perimeter.

2 vent tubes through the cap: input THROUGH the Scotch-Brite; and the Output pulling from ABOVE the Scotch-Brite.

No 'drain' implemented yet here................

When you stop laughing, try to feedback here???

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A bead of Black RTV around the perimeter of the Scotch-Brite, spun around to seal.

2 sections slip-jointed together, 3M tape.

Lotta' work for 'prototype'. Should know what to do with Polycarbonate tubing when I find it.......

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my solution:

Looks good there Jeff... What year? You put in valve stem seals too?

Does it cycle the oil back to crankcase? Or get disposed through 'service'?

I saw the oil pooled in the plenum, at the PVC intake port. CLEAN oil, so I want it cycled back to crankcase.

You got a schematic for the device?

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1990
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NO
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NO
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Yes, bottom comes off as a cup to empty
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No but this replaces the hard line from the 2 PCVs to the Front of the Plenum

Got a plan here.

You can see the oil that's pooled at the PCV intake port.

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In circle, you can barely see 2 intake ports - left is from cam cover, right from PCV.

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With a pipe bender, I'm going to put a 180' in the Red pipe end, to go UNDER the Red coolant manifold.

They're only 1/2" apart, so elbows ain't gonna' do it.

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Pipe bender didn't get it - no correct leverage.

So for now, the aluminum pipe section is out, and vacuum lines to this guy, with couplings, are going in.

And again, this is not permanent; only to get an idea of VOLUME of oil going through PCV system.......

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This thread, about oil burn at startup, is solved.

Had I stuck my finger in that oil, visible in pic, I would have smelled gasoline, from the leaking INJ's (now replaced).

I'm certain that the gasoline, on top of the oil in crankcase, was readily pulled into the PCV System (already known for pulling oil fumes).



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According to Marc H that oil in the plenum is fairly normal I have a catch can on my 91 Chuck mounted right where the air pump used to be. It catches quite a bit of oil between changes.