Somebody reassure me

[mike100]

So I pulled the plenum (again) after about 150-200 miles because I decided that I did need injectors after all (it was easy though-I know how to do it now).

I understand that the crankcase ventilation is poor on the LT5- is it ok that the plenum is oily so soon? I flogged it hard in the last 10 days or so. There is a mist on the back runners and there back of the plenum is pretty wet inside.

The compression is great; like 200+ in every hole cold, plugs are clean, and the car still has less than 27k miles.

[tomtom72]

Yea, that's our baby!


Ask JVD what they had to do with the PCV system when Pirate Racing campaigned a ZR-1...it was a very innovative answer for the blow by in the PCV system.

:cheers:
Tom

[todesengel]

Yea, that's our baby!


Ask JVD what they had to do with the PCV system when Pirate Racing campaigned a ZR-1...it was a very innovative answer for the blow by in the PCV system.

:cheers:
Tom

Did they introduce an external vaccuum source to it? I was thinking along those lines for when I go fi.

[tomtom72]

Not exactlly....if I look thru my photos I have a picture where you can see a bit of what they did. It's ...well I thought it was inventive & an inexpensive backyard answer.

They took an overflow tank from a C-4, ran the suction side of the PCV hose to it thru a barbed fitting and let the oil collect in there during the race. In the bottom of the tank was a washer pump. This contraption was where the battery was on a C-4...so as the car passed the pits they would look at it thru the gills to eye up the oil level. When it got high enough, they radioed the driver to flip the switch for the washer pump and pumped the oil back into the motor. I just don't remember where. JVD gave a lecture about racing the ZR-1 back at the 09 gathering and I attended, that's how I learned about his rough & ready answer to the blow by in the PCV system. I went out to the display floor and looked at the race cars because one was a ZR-1, and sure enough thru the left gill you could clearly see the overflow tank set up!

:cheers:

[tomtom72]

http://i215.photobucket.com/albums/cc123/tomZR1/my%2090/20thGathering187.jpg


This is the best picture I have. It only shows the tank. The cars were behind the ropes so I couldn't get a close up.

[mike100]

just wanted to have somebody tell me- but that endurance car tank really shows it was a design issue.

[todesengel]

http://i215.photobucket.com/albums/cc123/tomZR1/my%2090/20thGathering187.jpg


This is the best picture I have. It only shows the tank. The cars were behind the ropes so I couldn't get a close up.

That is pretty neat!

I could see a level indicator being useful to trigger the pump and do this automatically too.

I bet it would also work to route the pcv to the exhaust via check valves, like I did on my audi, with the collection unit in place with a second hose attached to the collector can bottom to pump directly back in as well without restricting the pcv while car was in use pumping the oil back in.

[sammy]

now thats a very cool idea , give one a good reason to move the battery into one of the rear wells . so darn simple yet effective

[zr1don]

I discovered oil in my plenum after a couple plenum pulls. I tried a cheap oil catch can off fleabay, it was collecting oil but the line to the plenum still showed signs of oil getting to the plenum. I went to Loews, bought a Kobalt water removal filter for air compressors. (I found this suggestion for an oil catch can on other forums). I removed the filter (it is made to seperate water not oil) and installed a wad of the scotchbrite type material that is in the valve covers where the pcv intake air goes into the cover. You also need a seperator between the inlet side and the exit side to force the incoming air/oil down into the body of the seperator and the exiting air is then forced up through the fibrous mater as it exits. The theory is to force the air to turn 90 deg toward the bottom of the container and then turn 180 deg up through the fibrous material as it exits. The changes in air direction removes oil from the flow (oil is heavier and will not turn as quickly as the air) and the fibrous material provides further oil stripping. This system is removing oil as evidenced by oil collecting in the bottom of the conainer and no signs of oil at the hose connector at the plenum. You can buy catch cans that work, but from my research, they are quite expensive. The cheap ones are just a container with an inlet and outle hose bib attached (no id of inlet and outlet on mine and the container was open, nothing in it) The cheap ones do collect some oil, but in my experience, do not seperate all of it, some oil still gets to the plenum.

[mike100]

I think I might still have one of those from a bunch of air compressor supply parts...hmmm..thx!